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9028479 Electrosurgical apparatus with real-time RF tissue energy control  
A radio-frequency (RF) amplifier having a direct response to an arbitrary signal source to output one or more electrosurgical waveforms within an energy activation request, is disclosed. The RF...
8901984 Direct current offset correction circuit  
A direct current offset correction circuit includes an obtaining module, a controller, and a correction module. The obtaining module obtains a DC offset voltage from an output of a target circuit....
8766724 Apparatus and method for sensing and converting radio frequency to direct current  
The apparatus and method thereof accurately sense and convert a radio frequency (RF) current signal to direct current (DC) independent of process variation and temperature, and without requiring...
8742849 Linear source follower amplifier  
A linear source follower amplifier is provided with a first metal-oxide semiconductor (MOS) field effect transistor (FET) having a gate to accept an ac input signal and a source to supply an ac...
8558621 Driver amplifier circuit and communication system  
Disclosed herein is a driver amplifier circuit, including: a first current source transistor of a first conductivity type, and a second current source transistor of the first conductivity type,...
8552803 Amplifier with dynamic bias  
Techniques are provided for dynamically biasing an amplifier to extend the amplifier's operating range while conserving power. In an embodiment, a detector is provided to measure the amplifier...
8503960 Amplifier and associated receiver  
An amplifier receives an input signal with an input node, provides an output signal in response, and includes a main branch and an auxiliary branch. The auxiliary branch is coupled between the...
8390491 Buffer to drive reference voltage  
Embodiments of the present invention may provide an integrated circuit that may comprise a first transistor to receive an input voltage signal at its gate and generate an output voltage signal at...
8390742 Semiconductor integrated circuit and video signal output circuit  
In a semiconductor integrated circuit arranged to perform sag compensation for a video signal, an operational amplifier includes a non-inverted input terminal, an inverted input terminal, and an...
8326371 DC current based on chip RF power detection scheme for a power amplifier  
A method, system, and apparatus of a DC current based on chip RF power detection scheme for a power amplifier are disclosed. In one embodiment, a method includes generating a scaled current from...
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...
8063706 Cascode CMOS RF power amplifier with programmable feedback cascode bias under multiple supply voltages  
A Radio Frequency (RF) cascode power amplifier operates with differing battery supply voltages. A transconductance stage has a transistor with an RF signal input at its gate. A cascode stage has...
8058929 Maintaining loop linearity in presence of threshold adjustment  
In one embodiment, a method includes receiving, at a filter comprising a Miller amplifier, a differential data signal output by a limiting amplifier (LA), the data signal comprising an output...
8004363 Wideband low-noise amplifier  
A wideband low-noise amplifier of the present invention is designed such that an input terminal is connected to a base of a first transistor, one terminal of a first passive element, and one...
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...
7944307 Wideband RF amplifiers  
A device for amplifying signals over a wide frequency range features stacked amplifying modules connected between a DC voltage source and an electrical ground. The stacking configuration reuses...
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...
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...
7825734 Amplifier having an output protection, in particular operational amplifier for audio application  
An amplifier with an output protection having an input stage defining a feedback node, an output stage connected to the feedback node and defining an output node supplying an output voltage, and a...
7786807 Cascode CMOS RF power amplifier with programmable feedback cascode bias under multiple supply voltages  
A Radio Frequency (RF) cascode power amplifier operates with differing battery supply voltages. A transconductance stage has a transistor with an RF signal input at its gate. A cascode stage has...
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...
7746171 Amplifier networks with controlled common-mode level and converter systems for use therewith  
Effective control of the common-mode level of amplifiers is obtained through control structures (both closed-loop and open-loop structures) which are directed to various amplifier functions such...
7737753 Method and device for adjusting or setting an electronic device  
Method and device for adjusting or setting an electronic device (1) exhibiting at least one input for an external input signal and at least one output signal output, the value or the state of the...
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...
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...
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...
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...
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...
7634096 Amplifier circuit for capacitive transducers  
An amplifier circuit for capacitive transducers, such as miniature electret or condenser microphones, wherein the amplifier circuit comprises bias control means adapted to improve settling of the...
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...
7564308 Self-biased operational amplifier  
An operational amplifier in accordance with one embodiment of the invention includes folded cascode transistors and a self-biased common-mode feedback circuit coupled to the folded cascode...
7515000 Active bias circuit for low-noise amplifiers  
A low-noise amplifier comprises a first amplification circuit that includes a control terminal and a first terminal. An impedance load communicates with the first terminal. A feedback circuit...
7486143 Circuit for biasing a transistor and related system and method  
An embodiment of a circuit for biasing a transistor such as an amplifier transistor includes reference and bias nodes, and includes buffer, reference, and feedback stages. The reference node...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
7061321 Low impedance read amplifier for magnetoresistive head  
A read amplifier system for connection through interconnects to a magnetoresistive (MR) head includes two input transistors, two bias transistors connected to the two input transistors by common...
7058360 Method and system for stabilizing the performance variation of a radio frequency device  
A method for stabilizing the performance variation of a primary radio frequency (RF) device is provided that includes providing a secondary RF device. An output signal is generated with the...
7049893 Apparatus, methods and articles of manufacture for power amplifier control in a communication system  
An apparatus and method for amplifying a radiofrequency (RF) signal. The apparatus comprises a control circuit including a first transistor, a second transistor, and a ballast resistor coupled...

Matches 1 - 50 out of 290 1 2 3 4 5 6 >