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| Number | Title | Issue Date |
| 8111104 | Biasing methods and devices for power amplifiers Biasing methods and devices for power amplifiers are described. The described methods and devices use the power amplifier output voltage to generate bias voltages. The bias voltages are obtained using rectifiers and voltage dividers. The described biasing methods an... | 02/07/2012 |
| 7982542 | Power transistor feedback circuit with noise and offset compensation A circuit comprises a first amplifier portion and a second amplifier portion. The first amplifier portion includes first and second transistors coupled together in a common-base configuration. A current mirror is coupled to the first and second transistors. A first ... | 07/19/2011 |
| 7915958 | Amplifier An amplifier comprises an input terminal that inputs an AC voltage signal; an amplifying unit having a transistor for amplifying the input AC voltage signal; a current detecting unit connected internally of said amplifying unit; and a control-current source controll... | 03/29/2011 |
| 7898336 | Ground skimming output stage Ground skimming output stages that are designed to drive wideband signals with the ability to provide a high quality output signal all the way to the low supply rail are provided. In accordance with an embodiment of the present invention, the output stage of the pre... | 03/01/2011 |
| 7772927 | Active bias Darlington amplifier The present invention relates to an active bias Darlington pair amplifier that may operate without a traditional bias resistor. The active bias Darlington pair amplifier includes an output transistor element that is cascaded with and driven from a driver transistor ... | 08/10/2010 |
| 7728671 | Semiconductor power device with bias circuit An RF power circuit comprises a power transistor having a gate and drain, an output matching network coupled to the drain and an input matching network coupled to the gate. A closed-loop bias circuit is integrated with the power transistor on the same die and couple... | 06/01/2010 |
| 7679450 | Amplifier auto biasing This disclosure relates to monitoring signal overshoot of an amplifier generated signal and automatically adjusting a quiescent current of the amplifier as a function of the monitored signal overshoot. ... | 03/16/2010 |
| 7675364 | Circuit and method of establishing DC bias levels in an RF power amplifier A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noi... | 03/09/2010 |
| 7663442 | Data receiver including a transconductance amplifier According to one embodiment, a system, apparatus, and method for receiving high-speed signals using a receiver with a transconductance amplifier is presented. The apparatus comprises a transconductance amplifier to receive input voltage derived from an input signal,... | 02/16/2010 |
| 7622994 | Bias circuit with increased power supply rejection According to one exemplary embodiment, a power supply rejection bias circuit includes a first amplifier coupled to a second amplifier, where the first amplifier receives a reference voltage, and a feedback voltage of the bias circuit. The bias circuit further includ... | 11/24/2009 |
| 7459978 | Ground skimming output stage Ground skimming output stages that are designed to drive wideband signals with the ability to provide a high quality output signal all the way to the low supply rail are provided. In accordance with an embodiment of the present invention, the output stage of the pre... | 12/02/2008 |
| 7446612 | Amplifier feedback and bias configuration A wireless communication device output amplifier configured to reduce or eliminate out of band oscillations from voltage standing waves generated by antenna impedance mismatch reflection. The amplifier is configured with an input, output, and biasing node. The biasi... | 11/04/2008 |
| 7425871 | Compensation units for reducing the effects of self-heating and increasing linear performance in bipolar transistors The systems and methods described herein provide for composite transistor circuit having a bipolar transistor and a compensation unit. The compensation unit can be configured to stabilize the DC biasing point of the bipolar transistor. The compensation unit can comp... | 09/16/2008 |
| 7405623 | Sensing circuit A sensing circuit capable of detecting very low current pulses of the order of 10's and 100's of micro amps. The sensing circuit comprises a common gate amplification stage capable of amplifying a sensed current, a comparison stage having as an input the amplified s... | 07/29/2008 |
| 7391264 | Amplifier The objective of the invention is to automatically and dynamically change the slew rate corresponding to the change rate and amplitude of the input signal. In this operational amplifier, when voltage (Vin) of the input signal is high, or when it changes d... | 06/24/2008 |
| 7333778 | System and method for current-mode amplitude modulation An amplifier circuit includes a power amplifier biased for saturated mode operation, and a controllable current source to provide supply current to the power amplifier. The controllable current source effects desired amplitude modulation of the output signal from th... | 02/19/2008 |
| 7330075 | Output impedance control circuit and control method thereof The invention provides an apparatus and a method for adjusting an output impedance of an output stage. The apparatus comprises a detector for outputting a direct current potential corresponding to the impedance of the output stage circuit. It also comprises a contro... | 02/12/2008 |
| 7313176 | Programmable on chip regulators with bypass A device and a method for processing high data rate serial data includes circuitry for recovering or generating a clock based with varying amounts of phase noise or jitter based upon a particular application. To achieve the foregoing, regulated and unregulated power... | 12/25/2007 |
| 7304540 | Source follower and current feedback circuit thereof A current feedback circuit is used in the source follower. The source follower includes a first MOS transistor and a current mirror. The first MOS transistor has a gate receiving an inputting signal and a source outputting an output signal. A drain current flows thr... | 12/04/2007 |
| 7268617 | Doherty microwave amplifier and signal processing method thereof A Doherty microwave amplifier having a main amplifier and a peaking amplifier, distributing and inputting an input signal to the main amplifier and the peaking amplifier to obtain an output signal by combining an output from the main amplifier and an output from the... | 09/11/2007 |
| 7262665 | Active bias circuit for low-noise amplifiers A low-noise amplifier with a first amplification circuit that includes a control terminal, a first terminal, and a second terminal that communicates with a first reference voltage. An impedance load that communicates with the first terminal and a feedback circuit th... | 08/28/2007 |
| 7233199 | Circuit and method of establishing DC bias levels in an RF power amplifier A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noi... | 06/19/2007 |
| 7233205 | Transistor biasing independent of inductor voltage drop A differential amplifier can include input transistors for receiving a differential input signal and an inductor connected to the input transistors. The inductor can protect a voltage supply from radio frequency in the differential input signal. The accuracy of this... | 06/19/2007 |
| 7224230 | Bias circuit with mode control and compensation for voltage and temperature An amplifier bias system. The amplifier bias system includes a battery voltage supply coupled with an amplifier transistor to be biased; an output node coupled with a gate of the amplifier transistor; and a current source coupled with the battery voltage supply, whe... | 05/29/2007 |
| 7224010 | Voltage-controlled amplifier for a signal processing system A voltage-controlled amplifier for a signal processing system includes an input voltage reception end, a first voltage-to-current converter, a reference current generator, a gain adjustment circuit, a first current mirror, and an output circuit. The voltage-controll... | 05/29/2007 |
| 7218175 | Dynamic feedback linearization An apparatus comprising an amplifier comprising at least one amplifier transistor, a threshold detection network and a bypass capacitor. The amplifier may be configured to generate an output signal at a collector in response to an input signal received at a base. Th... | 05/15/2007 |
| 7202743 | High frequency amplifier An emitter of a transistor (1) for high frequency amplification and a cathode of a diode (5) for generating reference voltage are grounded via an inductance (20). Anode electric potential of the diode (5) decreases with increase in output... | 04/10/2007 |
| 7196584 | Amplifier circuit An amplifier circuit 11 comprises an amplifier 12, an indicator of desired power 15, a power control circuit 14 and a power measuring circuit 13. The amplifier 12 amplifies an input signal to produce an output signal, and ha... | 03/27/2007 |
| 7183673 | Passive inductive switch A passive inductive switch for coupling a battery to a load in a remotely deployed battery-powered electronic device. The switch operates in response to a transmitted magnetic field at a particular frequency. The switch includes an antenna for transforming the magne... | 02/27/2007 |
| 7173492 | High frequency power amplification electric part and wireless communication system The present invention provides a high frequency amplifier suitable for use in a wireless communication system which performs detection of an output level necessary for feedback control by a current detection system, wherein control sensitivity in an area low in tran... | 02/06/2007 |
| 7155267 | Apparatus and method for monitoring antenna state of mobile station An apparatus and method are provided for monitoring an antenna state of a mobile station. A resister may be provided between a battery voltage terminal and a power source voltage terminal of a power amplifier. A voltage level corresponding to a dropped amount of a v... | 12/26/2006 |
| 7135924 | Cross-talk reduction circuit and method therefor In one embodiment, a pair of differential amplifiers have outputs coupled together. A signal received on one input results in signals coupled to the outputs that substantially cancel each other at the outputs. ... | 11/14/2006 |
| 7123099 | Two-stage amplifier with series L-R coupling network A two-stage amplifier that includes a first stage and a second stage and a first component and a second component coupled in series between the first and second stages. The first component is selected to provide AC decoupling of the first and second stages and the s... | 10/17/2006 |
| 7123095 | High frequency power amplifier circuit and radio communication system There is provided a high frequency power amplifier circuit capable of enhancing detection accuracy of an output level, necessary for feedback control of the high frequency power amplifier circuit, and capable of executing output power control with higher precision, ... | 10/17/2006 |
| 7113043 | Active bias circuit for low-noise amplifiers A low-noise amplifier includes a first amplification device. The first amplification device includes a control terminal, a first terminal, and a second terminal. The low-noise amplifier also includes a feedback circuit in communication with the control terminal and ... | 09/26/2006 |
| 7106137 | Method and apparatus for controlling the output power of a power amplifier A method and apparatus is provided for use with a power amplifier to provide a regulated supply to the power amplifier. The invention uses a combination of voltage and current regulation to overcome the problems encountered in the prior art. In one example, voltage ... | 09/12/2006 |
| 7103487 | Circuitry and methods for current measurements referred to a precision impedance Circuitry and methods for obtaining accurate measurements of current supplied by an integrated circuit are provided. Current calculations are performed using information from a precision termination resistor and from the ratio relationship of two on-chip resistors. ... | 09/05/2006 |
| 7093054 | Method of transferring signals between a TTL microcontroller and a RS232 device A switching transistor is placed between a serial port of a RS232 device and a parallel port of a TTL microcontroller. Selective activation of the switching transistor permits a high voltage signal to be transmitted from the power supply rail of the TTL microcontrol... | 08/15/2006 |
| 7088175 | Low noise, electric field sensor A system for measuring a free space electric field includes an ultrahigh impedance antenna positioned in the electric field to generate a signal from the electric field. An amplifier having an input port is provided to amplify the signal. The amplifier generates an ... | 08/08/2006 |
| 7078967 | Control of bias voltage The invention concerns a method for maintaining an optimal operating point of an LDMOS device stable, said LDMOS device producing an output signal including an error signal component. The method comprises separating said error signal component from the output signal... | 07/18/2006 |
