The amplifier includes an input circuit configured to convert an input signal into a current; an output circuit comprising at least one switching element for reducing a voltage change of an output end of the input circuit and configured to provide an output signal; and a biasing circuit connected to the at least one switching element to form a feedback loop for reducing the voltage change of the output end of the input circuit.

A circuit includes a first transconductance stage having an output. The circuit further includes an output transconductance stage, and a first source-degenerated transistor having a first control input and first and second current terminals. The first control input is coupled to the output of the first transconductance stage. The circuit also includes a second transistor having a second control input and third and fourth current terminals. The third current terminal is coupled to the second current terminal and to the output transconductance stage.

An amplifier has a first amplifying circuit configured to receive a voltage input and to output an amplified current, a second amplifying circuit configured to receive the amplified current and to output an amplified voltage, the second amplifying circuit comprising a pair of feedback resistive elements, each feedback resistive element being coupled to a gate and drain of a corresponding transistor in a pair of output transistors in the second amplifying circuit, and a feedback circuit configured to provide a negative feedback loop between an input and an output of the pair of output transistors, the feedback circuit including a first transconductance amplification circuit and a first equalizing circuit.

A transmit in-phase quadrature (IQ) amplifier includes a common gain stage to receive an input signal and to generate an amplified signal. The amplifier includes an IQ poly-phase filter coupled to the common gain stage to receive the amplified signal from the common gain stage and outputs a four-phase signal. The amplifier includes an in-phase (I) phase switching gain stage coupled to the IQ poly-phase filter to receive I components of the four-phase signal and outputs an amplified phase switching I signal. The amplifier includes a quadrature (Q) phase switching gain stage coupled to the IQ poly-phase filter to receive Q components of the four-phase signal and outputs an amplified phase switching Q signal.

A transconductance amplifier includes a first MOS transistor configured to receive a first voltage at a first node and output a first current to a fifth node in accordance with a third voltage at a third node; a second MOS transistor configured to receive a second voltage at a second node and output a second current to a sixth node in accordance with a fourth voltage at a fourth node; a third MOS transistor configured to output a third current to the third node in accordance with a fifth voltage at the fifth node; a fourth MOS transistor configured to output a fourth current to the fourth node in accordance with a sixth voltage at the sixth node; and a source degeneration network placed across the third node and the fourth node.

The present disclosure relates to a device comprising a first transimpedance amplifier comprising a first amplification stage with a first MOS transistor, a second transimpedance amplifier comprising a second amplification stage with a second MOS transistor, and a current source series-connected with the first and second amplification stages, the current source having a first terminal coupled to the drain of the first MOS transistor and a second terminal coupled to the drain of the second MOS transistor.

A sub-40 kilohertz low-frequency cutoff is provided for via a transimpedance amplifier comprising differential inputs and differential outputs; coupling capacitors comprising input terminals configured to receive electrical signals, and output terminals coupled to the differential inputs; and feedback paths coupled to the differential outputs and operable to level shift voltage levels at the input terminals. In some embodiments, the feedback paths comprise source follower transistors wherein the differential outputs are coupled to gate terminals of the source follower transistors or the feedback paths further comprise feedback resistors. In some embodiments, a bias resistor is coupled between the differential inputs.

A power conversion system comprising a system controller configured to generate an input signal in response to a system input and a switch controller coupled to the system controller, the switch controller configured to control a power switch. The switch controller comprises a driver interface configured to receive the input signal that indicates whether the power switch should be ON or OFF, the driver interface further configured to transmit one or more current pulses across a galvanic isolation using an inductive coupling. The driver interface further comprises a first local power supply configured to increase an output voltage of the first local power supply when a transmission of current pulses is imminent.

An amplifier has a first amplifying circuit configured to receive a voltage input and to output an amplified current, a second amplifying circuit configured to receive the amplified current and to output an amplified voltage, the second amplifying circuit comprising a pair of feedback resistive elements, each feedback resistive element being coupled to a gate and drain of a corresponding transistor in a pair of output transistors in the second amplifying circuit, and a feedback circuit configured to provide a negative feedback loop between an input and an output of the pair of output transistors, the feedback circuit including a first transconductance amplification circuit and a first equalizing circuit.

An amplifier circuit includes a voltage-to-current conversion circuit and a current-to-voltage conversion circuit. The voltage-to-current conversion circuit generates a current signal according to an input voltage signal, and includes an operational transconductance amplifier (OTA) used to output the current signal at an output port of the OTA. The current-to-voltage conversion circuit generates an output voltage signal according to the current signal, and includes a linear amplifier (LA), wherein an input port of the LA is coupled to the output port of the OTA, and the output voltage signal is derived from an output signal at an output port of the LA.