| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 181 | Amplifying device | US12680048 | 2007-10-26 | US08072264B2 | 2011-12-06 | Ulf Gustavsson |
| The present invention concerns a composite amplifier and a method for controlling the amplitude of a composite amplifier in a node of a wireless communication system. The composite amplifier comprises a first amplifier and a second amplifier that are arranged to be connected via an output combiner network to a load. The method comprises decomposing an input signal into a first signal component and a second signal component. Further, the method comprises differentiating the amplitude on the first signal component from the amplitude on the second signal component. the differentiation is made such that the aggregated efficiency of the composite amplifier is increased. The present invention also concerns a radio transmission device comprising a composite amplifier. | ||||||
| 182 | Transmission power controller | US11923408 | 2007-10-24 | US08064855B2 | 2011-11-22 | Earl McCune; Gary Do; Wayne Lee |
| A transmission apparatus has two modes of power amplifier operation, in which mode 1 is inherently accurate, mode 2 is inherently less accurate, and measurement of a power amplifier output from mode 1 is used to correct a power amplifier output in mode 2. Mode 1 may be a compressed mode and mode 2 may be a non-compressed mode. The apparatus may include a power controller that provides overlapping scaling factor sets for modes 1 and 2 and controls transmission power using the scaling factor sets. Upon a mode transition, the controller uses the overlapping scaling factors and changes the scaling factor set for the mode of a destination of the transition based on actual measurement representative of transmission power, for example, by carrying out power alignment loop operations. A cellular mobile device may include such transmission apparatus. A polar modulation transmitter is also disclosed. | ||||||
| 183 | Power supply voltage forming device and polar modulation transmission device | US12524671 | 2008-01-29 | US07956667B2 | 2011-06-07 | Taichi Ikedo; Akihiko Matsuoka |
| Provided is a power voltage forming device which can correct an offset voltage of a high-frequency power amplifier without degrading distortion characteristic of a high-frequency power amplifier. The power voltage forming device (100) includes: a level adjusting unit (103) which adjusts the level of input data subjected to analog conversion, according to an output level control value for controlling the output level of the high-frequency power amplifier (200); an analog adder (104) which performs analog addition of the offset data subjected to the analog conversion, to the signal after the level adjustment; a digital adder (101) which performs digital addition of the offset data to the input data before the analog conversion; and a selection unit (106) which selects whether to perform addition by the analog adder (104) or addition by the digital adder (101) according to the output level control value. | ||||||
| 184 | Amplifying circuit, AC signal amplifying circuit and input bias adjusting method | US12752402 | 2010-04-01 | US07948318B2 | 2011-05-24 | Hironobu Hongo; Katsutoshi Ishidoh |
| An amplifying circuit includes: an amplifying unit which amplifies an input signal and applies the amplified signal to a designated load; a current detection unit which detects a load current that flows into the designated load upon application of the amplified signal; an estimating unit which calculates, based on the voltage level of the input signal, an estimated value of the load current to be supplied to the load; and an adjusting unit which adjusts an input bias, to be applied to the amplifying unit, in such a manner so as to reduce a difference value representing a difference between the estimated value and the load current detected by the current detection unit. | ||||||
| 185 | Systems, methods, and apparatuses for linear polar transmitters | US11754112 | 2007-05-25 | US07860466B2 | 2010-12-28 | Wangmyong Woo; Chang-Ho Lee; Jaejoon Chang; Haksun Kim |
| Systems and methods are disclosed for providing a linear polar transmitter. The systems and methods may include generating an input amplitude signal and an input phase signal, where the input amplitude signal and the input phase signal are orthogonal components of an input signal, and where the input amplitude signal and the input phase signal are generated on respective first and second signal paths. The systems and methods may also include processing the input amplitude signal along the first signal path using an amplitude error signal to generate a predistorted amplitude signal, and processing the input phase signal along the second signal path using an phase error signal to generate a predistorted phase signal. The systems and methods may also include providing the predistorted amplitude signal along the first signal path and the predistorted phase signal along the second signal path to a power amplifier to generate an output signal, where the amplitude error signal is generated from a comparison of at least an amplitude portion of the output signal with the predistorted amplitude signal and where the phase error signal is generated from a comparison of at least a phase portion of the output signal with the predistorted phase signal. | ||||||
| 186 | DAC based switching power amplifier | US12394484 | 2009-02-27 | US07831227B2 | 2010-11-09 | Ahmadreza (Reza) Rofougaran; Amin Shameli |
| A power amplifier for use in a transmitter includes a first transistor having an input, a first node and a second node, a second transistor having an input, a first node and a second node and a digital to analog conversion module. The input of the first transistor is coupled to receive a first input, while the input of the second transistor is coupled to receive a second input. The second nodes of the first and second transistors provide an output of the power amplifier. The digital to analog conversion module is coupled to control current through the first and second transistors. | ||||||
| 187 | Polar transmitter amplifier with variable output power | US11478253 | 2006-06-29 | US07817962B2 | 2010-10-19 | Alireza Zolfaghari |
| Various embodiments are disclosed relating to wireless systems, and also relating to transmitter amplifiers, such as, for example, polar transmitter amplifiers with variable output power. According to an example embodiment, a circuit is provided including a plurality of selectable amplifier cells. Each amplifier cell may receive a phase or frequency modulated signal and an amplitude modulated signal. Each amplifier cell may output a signal based upon a combination of the received amplitude modulated signal and the received phase or frequency modulated signal if the amplifier cell is selected. The circuit may provide a variable output current or output power based upon the selection of one or more of the amplifier cells. | ||||||
| 188 | Power control and modulation of switched-mode power amplifiers with one or more stages | US11907172 | 2007-10-10 | US07755422B2 | 2010-07-13 | Stephan V. Schell; Wendell B. Sander; Ronald A. Meck; Robert J. Bayruns |
| This invention controls and modulates switched-mode power amplifiers to enable the production of signals that include amplitude modulation (and possibly, but not necessarily, phase modulation), the average power of which may be controlled over a potentially wide range. | ||||||
| 189 | Multistage amplifier apparatus with distortion compensation function | US11822125 | 2007-07-02 | US07689179B2 | 2010-03-30 | Yoshihiro Hara |
| Provided are an amplifier section in which N amplifiers (N is an integer of 2 or more) are serially connected to one another, and which performs an amplitude modulation on an input signal using an amplitude signal, which is a control signal; and M distortion compensation apparatuses (M is a natural number satisfying M | ||||||
| 190 | Method and system for improving efficiency over power control for linear and class AB power amplifiers | US11678797 | 2007-02-26 | US07616941B2 | 2009-11-10 | Ahmadreza Rofougaran |
| Aspects of a system for improving efficiency over power control for linear and class AB power amplifiers may include a current source circuit that enables determination of a bias current level for a PA circuit within an IC die based on an amplitude of an input modulation signal. The PA circuit may enable generation of an output signal based on a differential input signal and the input modulation signal to the current source circuit. A generated bias voltage may be applied to a transformer external to the IC die, but internal to an IC package containing the IC die and/or a circuit board containing the IC package. One or more amplifier bias voltage levels may be applied to the PA circuit wherein the amplifier bias voltage levels may be derived from the generated bias voltage level and/or the determined bias current level. | ||||||
| 191 | AMPLITUDE CONTROL CIRCUIT, POLAR MODULATION TRANSMISSION CIRCUIT AND POLAR MODULATION METHOD | US12425739 | 2009-04-17 | US20090262863A1 | 2009-10-22 | Taichi Ikedo |
| The amplitude control circuit of the present invention can reduce output noise and suppress a decrease in reception sensitivity. An amplitude control section (120), which is an amplitude control circuit, is provided with: a DA converter (121) that converts amplitude data into differential amplitude signals and outputs the differential amplitude signals; a level control section (122) that controls the levels of the differential amplitude signals according to transmission power information P; and an offset calculating section (123) that assigns the DC voltage based upon transmission power information P to the differential amplitude signals subjected to level control in the level control section (122). | ||||||
| 192 | RADIO RECEIVER AND RECEIVING SEMICONDUCTOR INTEGRATED CIRCUIT | US12352686 | 2009-01-13 | US20090186592A1 | 2009-07-23 | Takeshi Ikeda; Hiroshi Miyagi |
| A first-stage amplifier of an AM receiving circuit is built into an IC 2 as a differential amplifying circuit 3. The differential amplifying circuit 3 is connected to one pad P1 of the IC 2. Then, a high pass filter is configured by connecting a resistor Ra between two input terminals of the differential amplifying circuit 3 and connecting a capacitor Ca between the resistor Ra and ground and in series with the resistor Ra and ground. Thus, the resistor Ra and capacitor Ca integrated into the IC 2 allows hum noise to be removed. | ||||||
| 193 | Multi-mode amplitude modulator control method | US11707886 | 2007-02-20 | US07538631B2 | 2009-05-26 | Antti Immonen; Vlad Grigore |
| A power management device providing a power amplifier with power supply voltage is provided. The power management unit includes a parallel-hybrid amplitude modulator apparatus having a linear part configured to track frequency components of an input signal above a determined threshold frequency and a switching part arranged in parallel with the linear part and configured to track frequency components of the input signal below the determined threshold frequency. Additionally, the power management unit includes a current sensing and controlling part configured to determine the level of a direct current component at an output of the linear part and control the switching part to produce an output signal compensating for the direct current component at the output of the linear part to decrease the absolute level of the direct current at the output of the linear part. | ||||||
| 194 | POLAR MODULATION APPARATUS | US12280975 | 2007-02-27 | US20090039974A1 | 2009-02-12 | Maki Nakamura; Kaoru Ishida |
| Provided is a polar modulation apparatus capable of performing power limit with a simple configuration even when controlling a transmission power and increasing the transmission signal output power control range. A polar modulation device (1) includes an amplitude limit unit (6) for limiting an amplitude component of an amplitude signal, a D/A converter (7) for converting an inputted digital signal into an analog signal, a power control unit (8) for performing power control so that the inputted signal is an output signal based on the power control signal, a voltage control circuit (9) for supplying voltage to an amplitude modulator (11) according to the output signal from the power control unit (8), an angle modulator (10) for performing angle modulation according to a phase signal, and an amplitude modulator (11) for performing amplitude modulation on the signal subjected to angle modulation, according to the voltage supplied from the voltage control circuit (9). | ||||||
| 195 | METHODS AND APPARATUS FOR REDUCING PEAK-TO-RMS AMPLITUDE RATIO IN COMMUNICATION SIGNALS | US12172786 | 2008-07-14 | US20080304594A1 | 2008-12-11 | Stephan V. Schell; Richard W O. Booth |
| A pulse amplitude modulation (PAM) signal generator that injects a copy of a pulse into the PAM baseband signal prior to frequency upconversion and power amplification. The pulse comprises a function of, or an extra copy of, a pulse in the PAM baseband signal. The pulse injector analyzes the PAM baseband signal for times when a predetermined threshold is exceeded and forms a pulse that is constructed and arranged to reduce the amplitude of the PAM baseband signal to a desired peak amplitude when the pulse is added to the PAM baseband signal. In other embodiments the peak-to-RMS amplitude ratio reducing methods and apparatus used to process PAM signal are adapted for reducing peak-to-RMS amplitude ratios of amplitude modulation signals in polar modulation transmitters. Peak-to-RMS amplitude ratio reduction is performed in the quadrature domain, the polar domain, or both the quadrature and polar domains. | ||||||
| 196 | Method and apparatus for a fully digital quadrature modulator | US11203504 | 2005-08-11 | US07460612B2 | 2008-12-02 | Oren E. Eliezer; Francis P. Cruise; Robert B. Staszewski; Jaimin Mehta |
| A novel apparatus and method for a fully digital quadrature architecture for a complex modulator. The complex modulator can substitute for existing prior art analog quadrature modulator structures and those based on a digital polar architecture (r, θ). The modulator effectively operates as a complex digital-to-analog converter where the digital inputs are given in Cartesian form, namely I and Q representing the complex number I+jQ, while the output is a modulated RF signal having a corresponding amplitude and phase shift. The phase shift being with respect to a reference phase dictated by the local oscillator, which is also input to the converter/modulator. Several embodiments are provided including modulators incorporating dual I and Q transistor arrays, a single shared I/Q transistor array, modulators with single ended and differential outputs and modulators with single and dual polarity clock and I/Q data signals. | ||||||
| 197 | TRANSMISSION APPARATUS | US11923408 | 2007-10-24 | US20080268799A1 | 2008-10-30 | Earl McCune; Gary Do; Wayne Lee |
| A transmission apparatus has two modes of power amplifier operation, in which mode 1 is inherently accurate, mode 2 is inherently less accurate, and measurement of a power amplifier output from mode 1 is used to correct a power amplifier output in mode 2. Mode 1 may be a compressed mode and mode 2 may be a non-compressed mode. The apparatus may include a power controller that provides overlapping scaling factor sets for modes 1 and 2 and controls transmission power using the scaling factor sets. Upon a mode transition, the controller uses the overlapping scaling factors and changes the scaling factor set for the mode of a destination of the transition based on actual measurement representative of transmission power, for example, by carrying out power alignment loop operations. A cellular mobile device may include such transmission apparatus. A polar modulation transmitter is also disclosed. | ||||||
| 198 | Multi-mode amplitude modulator control method | US11707886 | 2007-02-20 | US20080157895A1 | 2008-07-03 | Antti Immonen; Vlad Grigore |
| A power management device providing a power amplifier with power supply voltage is provided. The power management unit includes a parallel-hybrid amplitude modulator apparatus having a linear part configured to track frequency components of an input signal above a determined threshold frequency and a switching part arranged in parallel with the linear part and configured to track frequency components of the input signal below the determined threshold frequency. Additionally, the power management unit includes a current sensing and controlling part configured to determine the level of a direct current component at an output of the linear part and control the switching part to produce an output signal compensating for the direct current component at the output of the linear part to decrease the absolute level of the direct current at the output of the linear part. | ||||||
| 199 | Bandwidth enhancement for envelope elimination and restoration transmission systems | US11512256 | 2006-08-30 | US20080057881A1 | 2008-03-06 | Richard James Dwyer |
| Systems and methods for increasing bandwidth capability of an envelope elimination and restoration (EER) transmitter. A frequency response of a power supply modulator of the transmitter is approximated. An inverse response is applied to the envelope signal prior to digital-to-analog conversion (DAC) and before the signal reaches the power supply modulator to pre-emphasize the signal thereby counteracting distorting affects of the modulator. The filter is implemented using any of a variety of different digital techniques including programmable logic, DSP, etc. | ||||||
| 200 | Systems, Methods, and Apparatuses for Multi-Path Orthogonal Recursive Predistortion | US11754122 | 2007-05-25 | US20070290749A1 | 2007-12-20 | Wangmyong Woo; Chang-Ho Lee; Jaejoon Chang; Haksun Kim |
| System and methods are provided for multi-path orthogonal recursive predistortion. The systems and methods may include generating a first orthogonal signal and a second orthogonal signal, where the first and second signals are orthogonal components of an input signal and processing, at a first predistortion module, the first orthogonal signal and a first error correction signal to generate a first predistorted signal. The system and methods may also include processing, at a second predistortion module, the second orthogonal signal and a second error correction signal to generate a second predistorted signal, and providing the generated first and second predistorted signals to a nonlinear device, where the nonlinear device generates an output based upon the first and second predistorted signals, where the first error correction signal is determined based upon an analysis of the output and the first predistorted signal, and where the second error correction signal is determined based upon an analysis of the output and the second predistorted signal. | ||||||
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