| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 81 | Systems, methods and devices for dual closed loop modulation controller for nonlinear RF amplifier | US11279857 | 2006-04-14 | US07555275B2 | 2009-06-30 | David R Lang |
| In accordance with various exemplary embodiments of the present invention, systems, methods and devices are configured to facilitate RF envelope amplitude control. For example, a RF envelope amplitude control system comprises: a RF amplifier, wherein the RF amplifier is associated with a feedback device that is configured to create a first feedback signal representing the power in an RF output signal; a transmit waveform generator configured to generate a reference waveform signal; an adaptive table waveform generator configured to compare the reference waveform signal and the first feedback signal and to create a second feedback signal based on that comparison; and a loop filter configured to combine the reference waveform signal, the first feedback signal, and the second feedback signal to form an amplifier control signal, wherein the amplifier control signal is provided to the RF amplifier to adjust the RF output signal to conform to a specified RF envelope. | ||||||
| 82 | Methods and systems for down-converting a signal using a complementary transistor structure | US11355167 | 2006-02-16 | US07376410B2 | 2008-05-20 | David F. Sorrells; Michael J. Bultman; Robert W. Cook; Richard C. Looke; Charley D. Moses, Jr. |
| Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal. | ||||||
| 83 | Method and system for frequency up-conversion with modulation embodiments | US11826416 | 2007-07-16 | US20070259627A1 | 2007-11-08 | David Sorrells; Michael Bultman; Robert Cook; Richard Looke; Charley Moses |
| A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In a first modulation embodiment, one information signal is phase modulated onto the carrier signal as part of the up-conversion process. In a second modulation embodiment, two information signals are multiplied, and, as part of the up-conversion process, one signal is phase modulated onto the carrier and the other signal is amplitude modulated onto the carrier. In a third modulation embodiment, one information signal is phase modulated onto the “I” phase of the carrier signal as part of the up-conversion process and a second information signal is phase modulated onto the “Q” phase of the carrier as part of the up-conversion process. In a fourth modulation embodiment, four information signals are phase and amplitude modulated onto the “I” and “Q” phases of the carrier as part of the up-conversion process. There are at least two implementations of each of the aforementioned embodiments. | ||||||
| 84 | Method and system for frequency up-conversion with modulation embodiments | US11049057 | 2005-02-03 | US07245886B2 | 2007-07-17 | David F. Sorrells; Michael J. Bultman; Robert W. Cook; Richard C. Looke; Charley D. Moses, Jr. |
| A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In a first modulation embodiment, one information signal is phase modulated onto the carrier signal as part of the up-conversion process. In a second modulation embodiment, two information signals are multiplied, and, as part of the up-conversion process, one signal is phase modulated onto the carrier and the other signal is amplitude modulated onto the carrier. In a third modulation embodiment, one information signal is phase modulated onto the “I” phase of the carrier signal as part of the up-conversion process and a second information signal is phase modulated onto the “Q” phase of the carrier as part of the up-conversion process. In a fourth modulation embodiment, four information signals are phase and amplitude modulated onto the “I” and “Q” phases of the carrier as part of the up-conversion process. There are at least two implementations of each of the aforementioned embodiments. | ||||||
| 85 | Digital amplitude modulation transmitter with pulse width modulating RF drive | US11105692 | 2005-04-14 | US20060252388A1 | 2006-11-09 | Ky Luu |
| A digital amplitude modulation (AM) transmitter with pulse width modulating RF drive is presented. A plurality of RF amplifiers, each, when turned on, amplifies an applied RF drive signal by the same amount to provide a unit step RF output. An encoder supplies turn-on signals to turn on a number of the RF amplifiers wherein the number varies as a function of the value of an applied audio signal. The width of the unit step RF output is varied as a function of the number of the RF amplifiers that are turned on. | ||||||
| 86 | Method and system for frequency up-conversion with a variety of transmitter configurations | US10197441 | 2002-07-18 | US07050508B2 | 2006-05-23 | David F Sorrells; Michael J Bultman; Robert W. Cook; Richard C Looke; Charley D Moses, Jr.; Gregory S. Rawlins; Michael W Rawlins |
| A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and phase reference. In another embodiment, the invention is used as a transmitter. The up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used as a frequency or phase reference, the oscillating signal is not modulated, and controls a switch that is connected to a bias signal. When the invention is being used in the frequency modulation (FM) or phase modulation (PM) implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate the bias signal. In the amplitude modulation implementation (AM), the oscillating signal is not modulated, but rather causes the switch to gate a reference signal that is substantially equal to or proportional to the information signal. In the FM and PM implementations, the signal that is output from the switch is modulated substantially the same as the modulated oscillating signal. In the AM implementation, the signal that is output from the switch has an amplitude that is a function of the information signal. In both embodiments, the output of the switch is filtered, and the desired harmonic is output. | ||||||
| 87 | Amplifier power control in frequency hopping applications and methods | US10667794 | 2003-09-22 | US20050064827A1 | 2005-03-24 | Lawrence Schumacher; Vimalkaushik Natarajan |
| A method in an amplifier, for example, a power amplifier in a wireless transmitter, including monitoring (310) a characteristic of the amplifier during a first active interval of the first set of active intervals, storing (320) the amplifier characteristic monitored during the first active interval of the first set of active intervals, correcting (340) an open-loop control signal to the amplifier based on the stored amplifier characteristic monitored during the first active interval of the first set of active intervals, and providing (350) the corrected control signal during a second active interval of the set of first active intervals subsequent to the first active interval of the set of first active intervals. | ||||||
| 88 | Frequency translation using optimized switch structures | US09293095 | 1999-04-16 | US06580902B1 | 2003-06-17 | David F. Sorrells; Michael J. Bultman; Robert W. Cook; Richard C. Looke; Charley D. Moses, Jr. |
| Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal. | ||||||
| 89 | Power oscillator for control of waveshape and amplitude | US10078850 | 2002-02-19 | US20020153961A1 | 2002-10-24 | Thomas Busch-Sorensen |
| An RF power oscillator for contactless card antennas shapes a carrier signal at the operating frequency utilizing a delay circuit having a number of taps for delaying the carrier signal by different lengths of time. The delayed signals are input into a buffer and output through resistors to a node coupled to the antenna. The resulting waveform for a square wave input signal, and equal-length delay taps, is a trapezoidal wave output. Any input wave form can be shaped in a variety of ways depending upon the combinations of delay taps used. Since the buffer drivers for each delayed wave switch state at slightly different times, the amplitude and bandwidth of emitted electromagnetic interference (EMI) is reduced for the transmission circuit. | ||||||
| 90 | Method and system for down-converting electromagnetic signals | US176022 | 1998-10-21 | US6061551A | 2000-05-09 | David F. Sorrells; Michael J. Bultman; Robert W. Cook; Richard C. Looke; Charley D. Moses, Jr. |
| Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal. | ||||||
| 91 | Method and apparatus for controlling the carrier of an amplitude-modulated transmitter | US727430 | 1985-04-26 | US4646359A | 1987-02-24 | Andreas Furrer |
| A method for controlling the carrier of an amplitude-modulated transmitter, wherein a saving in carrier power with simultaneous minimum dynamic distortions is achieved by digitizing the useful signal and digitally processing all control signals. The circuit for carrying out the method contains a digital computing circuit which calculates from the digital amplitude values of the useful signal a carrier-control value which controls the carrier level via a digital switching amplifier. | ||||||
| 92 | Switched capacitor SSB modulator | US392971 | 1982-06-28 | US4510466A | 1985-04-09 | Chieh Chang; Man S. Lee |
| An integrated single-sideband modulator comprises six integrated capacitors C1-C6 and first switch means alternately connecting C1 and C2 as feedback capacitors across a differential input operational amplifier A1. The amplifier has a virtual ground potential on its inverting input terminal for causing it to operate as a voltage source and render the circuit relatively insensitive to parasitic capacitance effects associated with capacitor plates. Second switch means cooperates with A1, C1 and C2 and is responsive to 4-phase clock signals for driving input capacitors C3-C6 so as to convert first and second quadrature-phase input signal voltages into first and second electrical charge flow signals on the inverting input terminal that are a function of products of representations of the first and second voltages in switch state time intervals and associated pulse trains which have a 90.degree. phase difference therebetween and a repetitive pattern such as +1, +1, -1, -1, etc. The amplifier and feedback capacitors combine the charge signals for producing a single-sideband signal on A1's output terminal. This circuit is converted to a balanced modulator by omitting C5 and C6. In an alternate embodiment of a single sideband modulator that requires only a pair of switched capacitors C11 and C12, a 4-phase switch means alternately charges C11 and C12 with associated ones of the quadrature-phase input signal voltages while alternately connecting C12 and C11 as feedback capacitors across A1, the polarity of each capacitors feedback voltage being reversed each time that capacitor is connected across the amplifier. This circuit is operated as a balanced modulator by omitting one of the capacitors. | ||||||
| 93 | Dual modulated remote control transmitter | US51420865 | 1965-12-16 | US3316488A | 1967-04-25 | REYNOLDS WILLARD S |
| 94 | Radio transmitting apparatus and methods | US80124459 | 1959-03-23 | US3065433A | 1962-11-20 | DOUGHARTY MARVIN E |
| 95 | Signaling system | US48991543 | 1943-06-07 | US2382567A | 1945-08-14 | LEE HOLLINGSWORTH R |
| 96 | Modulated carrier wave transmitter | US22318938 | 1938-08-05 | US2243221A | 1941-05-27 | EDWARD QUILTER WILLIAM ALFRED |
| 97 | Low-frequency amplifier | US8443736 | 1936-06-10 | US2226746A | 1940-12-31 | ERICH SCHULZE-HERRINGEN |
| 98 | Modulated carrier wave transmitter | US16816737 | 1937-10-09 | US2209510A | 1940-07-30 | HENRY CLOUGH NEWSOME; ERNEST GREEN |
| 99 | Modulator circuit | US11376236 | 1936-12-02 | US2204061A | 1940-06-11 | ROBERT ANDRIEU |
| 100 | Modulation system | US18464638 | 1938-01-12 | US2189897A | 1940-02-13 | FRITZ GUTZMANN; KREIS NIEDERBARNIM; ERICH SCHULZE-HERRINGEN |
QQ群二维码
意见反馈
意见反馈