| 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 | Amplifier circuit improved in linearity and frequency band | US11464660 | 2006-08-15 | US07362183B2 | 2008-04-22 | Tae Wook Kim; Bonkee Kim; Kwyro Lee |
| An amplifier circuit improved in linearity and frequency band comprises an amplification block, a feedback block and an output block. The amplification block comprises a main transistor, an auxiliary transistor, a first capacitor, a second capacitor, a main transistor bias unit, and an auxiliary transistor bias unit. The main transistor bias unit comprises a first bias resistor. The auxiliary transistor bias unit comprises a second bias resistor. The feedback block comprises first and second feedback resistors, and the output block comprises an output resistor and an output transistor. | ||||||
| 182 | Amplifier arrangement with controllable gain and method for controlling an amplifier gain | US11528254 | 2006-09-27 | US20080074184A1 | 2008-03-27 | Hans Pletzer; Werner Schelmbauer; Harald Pretl |
| An amplifier arrangement with controllable gain includes a first and a second amplifier device which each have a control input to receive a control signal to adjust a gain factor of the respective amplifier device. A control device is provided which is coupled to the second amplifier device to derive an effective gain factor of the second amplifier device as a function of the control signal. The control device further includes a control output coupled to the respective control inputs of the first and the second amplifier device to provide the control signal depending on a desired gain factor and the effective gain factor. | ||||||
| 183 | Apparatus for variable gain amplifiers and mixers | US11257048 | 2005-10-25 | US07345541B2 | 2008-03-18 | Adrian Bergsma |
| Novel uses of current-dividing multi-transistors (composite transistors) are described. The composite transistors can replace transistors in otherwise traditional circuits by making suitable design changes. Arrangements of these composite transistors in amplifiers and mixers allow easy selection of current and hence gain in circuits driven by them. In appropriate configurations, they allow the designer to dynamically select the current provided to successive stages. The invention may be used in any integrated circuit technology and assists designers in achieving effective and efficient designs. | ||||||
| 184 | Amplifier Coupling on a Reduced Area | US11576223 | 2004-09-30 | US20080061882A1 | 2008-03-13 | Joakim Nilsson |
| The invention discloses an amplifier (200, 400, 500) coupling comprising a first (230), a second (240), a third (250) and a fourth (260) transistor, additionally comprising a signal input port (220) and a signal output port (210, 410). The input port of the amplifier is connected to the first, second, third and fourth transistors such that an input signal to the amplifier is input to the first and the fourth transistor in parallel, and to the second and third transistors in parallel, with the outputs from the first and second transistors being connected in series to each other, and the outputs from the fourth and third transistors being connected in series with each other, said outputs being connected in parallel to each to the one output port of the amplifier | ||||||
| 185 | CALIBRATION CIRCUIT | US11841286 | 2007-08-20 | US20080046212A1 | 2008-02-21 | Hideyuki YOKO; Hiroki FUJISAWA |
| To include a first replica buffer that has substantially the same circuit configuration as a pull-up circuit which constitutes an output buffer and a second replica buffer that has substantially the same circuit configuration as a pull-down circuit which constitutes the output buffer. When a first calibration command ZQCS is issued, either a control signal ACT1 or ACT2 is activated, and a calibration operation is performed for either the first replica buffer or the second replica buffer. When a second calibration command ZQCL is issued, both of the control signals ACT1, ACT2 are activated and the calibration operation is performed for both the first replica buffer and the second replica buffer. | ||||||
| 186 | CONSTANT-CURRENT CIRCUIT AND SYSTEM POWER SOURCE USING THIS CONSTANT-CURRENT CIRCUIT | US11834224 | 2007-08-06 | US20080036442A1 | 2008-02-14 | Ippei Noda |
| A constant-current circuit and a system power source using this constant-current circuit are disclosed, which can generate plural highly accurate constant currents and supply them as bias currents by reducing variations caused by a change of a manufacturing process and a change of temperature. An operational amplification circuit AMP controls the operation of PMOS transistors M1 and M2 so that negative feedback is applied to a variation of one of currents i1 and i2 flowing from the PMOS transistors M1 and M2 and the variation is canceled. By making a constant current, which flows in a resistor R1 connected to a potential difference generated by a difference of current densities flowing in two pnp transistors Q1 and Q2 to which currents are correspondingly supplied from the PMOS transistors M1 and M2, to be a reference current; each of PMOS transistors MA1 through MAn whose operation is controlled by the operational amplification circuit AMP generates a current proportional to the reference current and outputs the generated current. | ||||||
| 187 | Auto-range current mirror circuit | US11477378 | 2006-06-30 | US20080001672A1 | 2008-01-03 | Fu-Yang Shih; Hsu-Yuan Chin |
| An auto-range current mirror circuit has a current sensing circuit, a front and rear stage current mirrors each has an adjustable amplifying rate. The current sensing circuit presets a threshold current and has an input current of the front stage current mirror. The current sensing current compares the input current with a threshold current and then outputs a controlling signal to the front and rear stage current mirrors to adjust a suitable amplifying rate. Therefore, a bias current of the rear stage current mirror is amplified by the suitable amplifying rate to improve the quality of output current of the rear stage current mirror. | ||||||
| 188 | Cascode-connected amplifier circuit, semiconductor integrated circuit using same, and receiving apparatus using same | US11717724 | 2007-03-14 | US20070296507A1 | 2007-12-27 | Mutsumi Hamaguchi |
| A cascode-connected amplifier circuit according to the present invention includes two transistors cascode-connected to each other. The cascode-connected amplifier circuit includes a switching element by which it is determined whether or not a collector of an input-side transistor is grounded. Thus, a cascode-connected amplifier circuit can be realized which makes it possible that: an improvement in isolation is made so that operation of the cascode-connected amplifier circuit is surely stopped by simple means. | ||||||
| 189 | High dynamic range pre-power amplifier incorporating digital attenuator | US11296148 | 2005-12-06 | US20070129030A1 | 2007-06-07 | Petteri Litmanen; Heng-Chih Lin |
| A novel digital attenuator circuit and associated pre-power amplifier (PPA) that substantially increases the dynamic range of the amplifier. Increased dynamic range is achieved by placing a digital current attenuator circuit at the output of the pre-power amplifier so that the minimum possible current output of the transistor switch array of the PPA can be further attenuated. The attenuator functions to split the current between the load and the power supply VDD (i.e. AC ground) based on device ratio that is controlled digitally via an input power control word. The digital attenuator is constructed as a segmented digitally controlled matrix or cell array comprising at least a pass and bypass matrix or array. The pass matrix controls the amount of current output from the PPA while the bypass matrix controls the amount of current shorted to the AC ground (i.e. power supply). By varying the number of transistors on or off in each matrix, the power output of the PPA can be easily and accurately controlled. | ||||||
| 190 | Differential Operational Amplifier | US11531207 | 2006-09-12 | US20070057727A1 | 2007-03-15 | Akinobu ONISHI |
| Disclosed is a differential operational amplifier that outputs first and second output voltages corresponding to first and second input voltages, the amplifier comprising a differential circuit that operates depending on the first and second input voltages; a control voltage generation circuit that generates a control voltage for making an intermediate voltage of the first and second output voltages become a predetermined reference voltage; a variable current generation circuit that is connected serially to the differential circuit to generate a variable current corresponding to the control voltage; and a constant current generation circuit that is connected in parallel with the variable current generation circuit to generate a constant current, control being performed with the variable current and the constant current such that the intermediate voltage turns to the reference voltage. | ||||||
| 191 | Radio frequency power amplifier module | US11543160 | 2006-10-05 | US20070024376A1 | 2007-02-01 | Akira Kuriyama; Masami Ohnishi |
| An object of the present invention is to provide a radio frequency power amplifier of multi stage amplifying method that is designed to reduce instability of output power caused by electromagnetic coupling of bias supply terminals and interconnections of each stage to thereby operate stably. Another object of the present invention is to provide a radio frequency power amplifier that is designed to reduce distortion of output power caused by electromagnetic coupling of bias supply terminals and interconnections of each stage to thereby provide high efficiency. The above objects can be achieved by providing a first interconnection connected to a terminal for supplying a voltage for collector driving to a power amplifying transistor, a second interconnection connected to a terminal for supplying a voltage for collector driving to a second transistor controlling a base bias voltage of the above transistor, and one or more ground parts for electromagnetic shield, wherein the first interconnection and the second interconnection are separated by one or more of the ground parts for electromagnetic shield. | ||||||
| 192 | Power amplifier arrangement, particularly for mobile radio, and method for determining a performance parameter | US11476461 | 2006-06-28 | US20070008038A1 | 2007-01-11 | Bernd-Ulrich Klepser; Michael Asam; Markus Zannoth |
| A power amplifier arrangement includes a power amplifier with an input for a radio-frequency signal and an output for delivering a second radio-frequency signal. The second radio-frequency signal has a current and a voltage. A second element is configured to deliver a first signal derived from the current of the second radio-frequency signal. Furthermore, a first element is provided to deliver a second signal derived from the voltage of the second radio-frequency signal. An evaluating circuit detects in-phase components of the first and the second signal. As a result, in-phase current and voltage components can be detected together which produce the active power of the second radio-frequency signal by multiplication. | ||||||
| 193 | Radio frequency variable gain amplifier with linearity insensitive to gain | US11100143 | 2005-04-05 | US07126428B2 | 2006-10-24 | Li Lin; Arya Reza Behzad |
| A multi-stage, variable gain amplifier whose linearity is relatively insensitive to variations in gain control is disclosed. The amplifier includes a primary cascoded pair of transistors for producing a primary output current from an input voltage as a function of a primary cascode control voltage. The amplifier further includes one or more secondary cascoded pairs of transistors coupled to the primary cascoded pair of transistors for producing one or more secondary output currents from the input voltage as a function of one or more secondary cascode control voltages. The output current of the RF circuit is a sum of the primary output current and the one or more secondary output currents. | ||||||
| 194 | High-frequency amplifier | US10520077 | 2003-06-11 | US20060152286A1 | 2006-07-13 | Hiroomi Ueda; Shintaro Shinjo; Noriharu Suematsu; Kazutomi Mori; Akira Inoue; Akira Ohta; Hiroaki Seki |
| A high frequency amplifier includes a constant voltage driven amplifier 1 using as its amplifying element a bipolar transistor 7 with its base biased by a constant voltage, and a constant current driven amplifier 2 using as its amplifying element a bipolar transistor 8 with its base biased by a constant current. The idle current of the constant current driven amplifier 2 is set at a low value. In accordance with the idle current, the idle current of the constant voltage driven amplifier 1 is adjusted, and the two amplifiers are combined in parallel. | ||||||
| 195 | Method and apparatus for doherty amplifier biasing | US10808056 | 2004-03-24 | US07064615B2 | 2006-06-20 | Enver Krvavac; James E. Mitzlaff; Mark I. Van Horn |
| Apparatus and methods are described for biasing amplifiers with multiple outputs. A semiconductor die may include a reference Field Effect Transistor (FET) integrated on the semiconductor die and coupled to an amplifier integrated on the semiconductor die. A voltage offset circuit may also be integrated on the semiconductor die for determining the voltage needed to operate the amplifier. | ||||||
| 196 | High linearity smart HBT power amplifiers for CDMA/WCDMA application | US10782598 | 2004-02-18 | US07026876B1 | 2006-04-11 | Reza Esfandiari; Nam-Min Cho; Alzon B. Canilao; Ron Green; Hyungmo Yoo |
| A power amplifier includes larger size transistors to provide higher power gain at lower frequencies. Transistors of transistor unit cells include a horseshoe-shaped emitter and a strip-shaped base to increase gain. Transistors are combined at a first level to form transistor arrays, which are combined with bonding wires at a second level to an output micro strip transmission line. A Vbe referenced bias circuit may include a smart function to lower quiescent current. | ||||||
| 197 | Radio frequency power amplifier module | US11003480 | 2004-12-06 | US06956438B2 | 2005-10-18 | Akira Kuriyama; Masami Ohnishi |
| An object of the present invention is to provide a radio frequency power amplifier of multi stage amplifying method that is designed to reduce instability of output power caused by electromagnetic coupling of bias supply terminals and interconnections of each stage to thereby operate stably. Another object of the present invention is to provide a radio frequency power amplifier that is designed to reduce distortion of output power caused by electromagnetic coupling of bias supply terminals and interconnections of each stage to thereby provide high efficiency. The above objects can be achieved by providing a first interconnection connected to a terminal for supplying a voltage for collector driving to a power amplifying transistor, a second interconnection connected to a terminal for supplying a voltage for collector driving to a second transistor controlling a base bias voltage of the above transistor, and one or more ground parts for electromagnetic shield, wherein the first interconnection and the second interconnection are separated by one or more of the ground parts for electromagnetic shield. | ||||||
| 198 | Method and apparatus for doherty amplifier biasing | US10808056 | 2004-03-24 | US20050212602A1 | 2005-09-29 | Enver Krvavac; James Mitzlaff; Mark Horn |
| Apparatus and methods are described for biasing amplifiers with multiple outputs. A semiconductor die may include a reference Field Effect Transistor (FET) integrated on the semiconductor die and coupled to an amplifier integrated on the semiconductor die. A voltage offset circuit may also be integrated on the semiconductor die for determining the voltage needed to operate the amplifier. | ||||||
| 199 | Power amplifier module | US11030968 | 2005-01-10 | US20050174178A1 | 2005-08-11 | Kazutaka Yamazaki; Ichiro Kato; Shigeru Kataoka |
| An amplifier 2c amplifies a transmit signal and outputs the amplified transmit signal to an antenna 10. A drive current for driving the amplifier 2c is inputted to a drive current input terminal 7. A current divider circuit 41 is provided between the drive current input terminal 7 and the amplifier 2c, and divides the drive current among a plurality of paths. The current divider circuit 41 includes a plurality of switching elements provided in the paths, respectively, and switched between a conduction state and a blocking state; and a resistance element 13 provided in at least one of the plurality of paths. A detection section 5 detects an electrical parameter in the resistance element. A control section 6 switches the plurality of switching elements between a conduction state and a blocking state, based on the electrical parameter detected by the detection section 5. | ||||||
| 200 | Base bias current control for an amplifier | US10153868 | 2002-05-24 | US06771129B2 | 2004-08-03 | Jesper Riishøj; Peter Dam Lerke |
| An amplifier circuit includes a bias control feedback loop. A sensing transistor (105) is matched to one or more power transistors (101a, 101b, 101c) and is correspondingly biased. The difference between collector voltage of the sensing transistor (105) and a reference voltage amplified by a differential amplifier (111, 114) provides the base bias voltage for the power transistors (101a, 101b, 101c) and the sensing transistor (105). The gain of the amplifier is controlled by applying a control voltage to a resistor (110) connected to the collector of the sensing transistor (105). | ||||||
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