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| Number | Title | Issue Date |
| 8179199 | Transistor resistor and associated method A transistor resistor and an associated method are provided to improve the resistance linearity of the transistor resistor. The transistor resistor includes a transistor operating in the resistive region, where the drain and source of the transistor receive an input... | 05/15/2012 |
| 8138836 | Emitter-follower type bias circuit An emitter-follower bias circuit supplying a bias voltage to the base of an amplification transistor includes: a depletion mode FET boosting a reference voltage; and an emitter-follower circuit generating the bias voltage in response to the reference voltage boosted... | 03/20/2012 |
| 8138835 | Wide band LNA with noise canceling Techniques to improve low noise amplifiers (LNAs) with noise canceling are described. LNA includes a first and a second amplifier which work together to noise cancel the noise generated at an input stage circuit. The input stage circuit receives an RF signal and is ... | 03/20/2012 |
| 8106712 | Systems and methods for self-mixing adaptive bias circuit for power amplifier Systems and methods for providing a self-mixing adaptive bias circuit that may include a mixer, low-pass filter or a phase shifter, and a bias feeding block. The self-mixing adaptive bias circuit may generate an adaptive bias signal depending on input signal power l... | 01/31/2012 |
| 8072270 | CMOS RF power amplifier with LDMOS bias circuit for large supply voltages Bias circuitry that may be used within a communications or other device includes a first current mirror having first and second transistors with sources coupled to ground and operable to receive a reference current at a drain of first transistor. A second current mi... | 12/06/2011 |
| 8067985 | Resonant operating mode for a transistor The PN junctions of a transistor are biased for operation in the active mode but an initial flow of current reverses the bias of the base-emitter junction causing the transistor to conduct a resonant current with a voltage less than the forward junction voltage of s... | 11/29/2011 |
| 8054135 | Class-E amplifier and lighting ballast using the amplifier An amplifier comprises a power source, a load network comprising a load and a resonance circuit, an input branch having a first end electrically coupled to the power source and a second end electrically coupled to the load network, and an active switch having one te... | 11/08/2011 |
| 8040187 | Semiconductor integrated circuit device A semiconductor integrated circuit device constituting an inverting amplifier employs a cascode current source as a current source. In the semiconductor integrated circuit device, a high-potential-side transistor of the cascode current source and a low-potential-sid... | 10/18/2011 |
| 8026767 | Adaptive bias circuit and system thereof An adaptive bias circuit which provides a more sensitive adaptive bias current with respect to power level is used for biasing an electronic circuit. The adaptive bias circuit has a first transistor coupled to a power supply, a voltage bias circuit coupled to the fi... | 09/27/2011 |
| 7999620 | Amplifier with dither An analog amplifier includes at least one signal path. Each of the at least one signal path extends between an input and an output and includes a load device coupled to the output and a transistor coupled to the input. The analog amplifier further includes a dither ... | 08/16/2011 |
| 7969244 | System and method for reducing flicker noise from CMOS amplifiers A technique is provided for acquiring data with reduced correlated low frequency noise interference via a data acquisition circuit. The data acquisition circuit includes a plurality of data channels comprising a plurality of amplifiers and a biasing circuit for prov... | 06/28/2011 |
| 7961049 | Amplifier with compensated gate bias An amplifier circuit includes an amplifier stage (10) having an amplifier transistor (104) with a gate coupled to an input (100) of the amplifier stage, a source coupled to a reference connection (gnd) and a drain coupled to a positive power sup... | 06/14/2011 |
| 7948321 | FET bias circuit A FET bias circuit applies a bias voltage that is not adjusted separately to an amplifying element FET of a FET amplifying circuit. In the FET bias circuit is provided a monitor element FET m having a gate connected to the gate of the amplifying element FET a and a ... | 05/24/2011 |
| 7948320 | Synchronized temperature protection for class-AB amplifiers The present invention relates to a synchronization circuit for an integrated amplifier provided with a bandwidth control in accordance to a bandwidth control signal, wherein said synchronization circuit comprises a control terminal for a control signal and rank sele... | 05/24/2011 |
| 7944309 | Transconductance bias circuit, amplifier and method Methods, circuits and apparatus for biasing an amplifier to maintain consistent operational characteristics over variations in fabrication processes and operational temperature conditions are disclosed. A bias is determined by first comparing output voltages of repl... | 05/17/2011 |
| 7940124 | Bi-directional and adjustable current source A Bi-Directional and Adjustable Current Source (“BACS”) for providing an amplifier input with a voltage signal that is linear, where an output of the BACS and the amplifier input are shunted with a capacitor, is described. The BACS may include a first switch in ... | 05/10/2011 |
| 7940123 | DC series-fed amplifier array There is disclosed an amplifier module which may include a plurality of N circuit devices, each of which may have at least two stages of amplification. Each circuit device may additionally have a DC input power terminal, a DC power return terminal, and at least one ... | 05/10/2011 |
| 7936219 | Power amplifier bias circuit A power amplifier and bias circuit includes a combination circuit in which a voltage drive bias circuit and a current drive bias circuit are connected in a parallel relationship with each other. The power amplifier bias circuit also includes an idle current control ... | 05/03/2011 |
| 7932783 | Resonant operating mode for a transistor The PN junctions of a transistor are biased for operation in the active mode but an initial flow of current reverses the bias of the base-emitter junction causing the transistor to conduct a resonant current with a voltage less than the forward junction voltage of s... | 04/26/2011 |
| 7932782 | Average power efficiency enhancement and linearity improvement of microwave power amplifiers A biasing circuit is used to provide low distortion and high efficiency operation of a microwave power amplifier. The biasing circuit utilizes the nonlinear rectified current of a microwave diode or transistor for biasing the amplifying transistor self-adaptively. T... | 04/26/2011 |
| 7920028 | Bias circuit and control method for bias circuit A bias circuit for applying a bias voltage to a nonlinear amplification circuit, including a constant-current source; and a first, second, third, and fourth transistors, wherein a current mirror circuit is configured by the first transistor and the second transistor... | 04/05/2011 |
| 7898339 | Amplifier circuit An amplifier circuit with favorable linearity is provided. An amplifier of the present invention is provided with an amplifier MOS transistor, a diode-connected transistor block for negative feedback source impedance constituted by series-parallel connection ... | 03/01/2011 |
| 7893771 | Wideband linearization and adaptive power management for microwave power amplifiers A power amplifier includes a bipolar transistor and a self-adaptive bias network situated between an RF input and the base of the bipolar transistor. The self-adaptive bias network suppresses the low frequency even-order intermodulation components. The self-adaptive... | 02/22/2011 |
| 7855603 | Temperature compensated self-bias darlington pair amplifier A Darlington pair amplifier includes a temperature compensation device. In one case, the device is a resistor connected in series between: (a) an intermediate node of two bias resistors for the Darlington pair, and (b) the control terminal of the Darlington pair. In... | 12/21/2010 |
| 7843271 | Audio amplifier and methods for use therewith An audio amplifier includes an output stage for generating an output stage voltage in response to an input signal and an output stage quiescent current. A controlled current source controls the output stage quiescent current in response to a quiescent current signal... | 11/30/2010 |
| 7839217 | High-frequency amplifier, high-frequency module, and mobile wireless apparatus using the same A high-frequency amplifier with high linearity is provided that is easy to integrate and is resistant to variations in transistor characteristics due to process variation. The high-frequency amplifier includes a bias circuit to bias an amplifying element that amplif... | 11/23/2010 |
| 7834701 | Bias circuit and semiconductor integrated circuit including the bias circuit A plurality of analog signals are input to input terminals of an analog signal processing circuit ANA2 via respective capacitors C. In a bias circuit Bias for supplying a bias voltage such as a signal ground of the analog signals to the analog signal processi... | 11/16/2010 |
| 7830208 | High-power common-base amplifier employing current source output bias A common-base amplifier for a bipolar junction transistor or a heterojunction bipolar transistor employs an active current source output biasing to provide for improved power output in a power saturation region providing increased power for a given transistor area s... | 11/09/2010 |
| 7825733 | Circuit providing compensated power for sense amplifier and driving method thereof The present invention discloses a circuit providing a power for a sense amplifier that stabilizes a power voltage supplied to the sense amplifier by compensating a noise generated in the power voltage when the sense amplifier operates with an selectively generated d... | 11/02/2010 |
| 7804363 | Open loop DC control for a transimpedance feedback amplifier A transimpedance amplifier having open-loop DC control is provided. The open-loop feedback control may provide a DC bias that is configurable based on the characteristics of an input device, such as, a photodiode or a magnetoresistor. The open-loop feedback control ... | 09/28/2010 |
| 7777573 | Operational amplifier having adjustable bias current and related source driver of display thereof An operational amplifier includes an amplifying circuit and a bais current generating circuit. The bias current generating circuit generates a bias current to the amplifying circuit. The amplifying circuit comprises a current adjusting unit and a current mirror. The... | 08/17/2010 |
| 7777574 | Closed loop ramp up for pop and click reduction in an amplifier To reduce pop or click during turn-on, a method and apparatus are provided. Initially, a plurality of current sources in the amplifier is actuated. The amplifier is transitioned from an off-state to an on-state in a class B amplifier mode by de-coupling each input n... | 08/17/2010 |
| 7733186 | Bias circuit and amplifier using the same A bias circuit including: a first current source which generates a first current; a second current source which generates a second current having a temperature-to-output current characteristic that an output current characteristic increases or decreases with a chang... | 06/08/2010 |
| 7728672 | RF amplifier Provided is a radio frequency (RF) amplifier. The RF amplifier includes an amplification circuit amplifying an RF signal, a bias voltage generation circuit supplying a bias voltage of the amplification circuit, and a first bias resistor connected between the amplifi... | 06/01/2010 |
| 7714659 | Bias circuit with a feedback path and a method for providing a biasing signal Embodiments of the invention show a bias circuit for providing a biasing signal at a bias connection. The bias circuit includes a bias transistor and a feedback node, wherein the feedback node is coupled to a control terminal of the bias transistor via a first imped... | 05/11/2010 |
| 7692490 | Power amplifying device having linearizer There is provided a power amplifying device having a linearizer in which a bias circuit has an initial impedance set when initially operated, then the impedance is varied according to a level of an input signal and the input signal is amplified in a broad range from... | 04/06/2010 |
| 7671684 | FET bias circuit A FET bias circuit applies a bias voltage that is not adjusted separately to an amplifying element FET of a FET amplifying circuit. In the FET bias circuit is provided a monitor element FET m having a gate connected to the gate of the amplifying element FET a and a ... | 03/02/2010 |
| 7639084 | Power amplifier with nonlinear compensation, and method thereof A power amplifier amplifying an input signal is provided, comprising a power amplifier circuit, a bias circuit, and a compensation circuit. The power amplifier circuit has an input impedance responsive to the input signal, and amplifies the input signal to generate ... | 12/29/2009 |
| 7633346 | Transconductance compensating bias circuit and amplifier A transconductance compensating bias circuit is disclosed that includes a first field-effect transistor (FET) having a first electrode, a second electrode, and a gate connected to the first electrode, wherein a reference current flows through the first and second el... | 12/15/2009 |
| 7612613 | Self regulating biasing circuit A disclosed self regulating biasing circuit (SRBC) includes an unregulated node that couples to an unregulated power supply that produces a supply voltage. An impedance element of the SRBC carries an unregulated current having a nominal component and a variance comp... | 11/03/2009 |
