When a signal source sends a radio-frequency signal to an input amplification circuit, a control circuit sends a first control signal to the input amplification circuit according to the frequency of the radio-frequency signal, the input amplification circuit receives the first control signal and forms an input oscillation loop, the radio-frequency signal forms an amplified first signal through the input oscillation loop, and the input amplification circuit sends the first signal to the output amplification circuit. According to the frequency of the radio-frequency signal, the control circuit transmits a second control signal to the output amplification circuit, which forms an output oscillation loop matched with the first signal. The first signal is amplified by the output oscillation loop to form an emitting signal, the output amplification circuit transmits the emitting signal to the emitting antenna for emitting, thereby improving the utilization ratio of a radio-frequency front end chip package.

A negative feedback inductor and a gate inductor are formed in different wiring layers of a substrate so as to be at least partially overlapped with each other in a plan view. When the lower wiring layer is thinner and the upper wiring layer is thicker, the negative feedback inductor Lc is formed in the lower wiring layer that is thinner.

A data output device is provided. The data output device includes a converter circuit configured to generate a conversion signal based on an output signal; a boosting circuit configured to generate a boosting signal based on the output signal; and an output circuit configured to generate the output signal based on an input signal and a feedback signal, the feedback signal being based on the conversion signal and the boosting signal.

A circuit for filtering a signal corresponding to a time of flight (TOF) of light from a laser reflected off an object to a photo detector, the circuit includes a preamplifier, a DC cancelation loop, and an AC cancelation loop. The preamplifier may be configured to receive the signal from the photo detector corresponding to an output of the laser reflected off an object remote from the laser and photo detector. The DC cancelation loop includes a current feedback DC servo loop. The AC cancelation loop includes a feedback network driven by a floating class AB output stage, and the preamplifier configured to drive the floating class AB output stage, wherein the preamplifier is driven by an error signal of the feedback network and creates an AC signal path with the feedback network and floating class AB output stage.

A liquid ejecting apparatus includes a drive circuit that outputs a drive signal, wherein the drive circuit includes a modulation circuit that modulates a base drive signal to output a modulation signal, an amplifier circuit that amplifies the modulation signal to output an amplified modulation signal, a demodulation circuit that demodulates the amplified modulation signal to output the drive signal, and a substrate on which the modulation circuit, the amplifier circuit, and the demodulation circuit are provided, wherein the substrate includes a first face and a second face opposite to the first face, wherein the demodulation circuit includes a first coil and a second coil electrically coupled in parallel with the first coil, and wherein the first coil is positioned so as to overlap at least part of the second coil in a direction normal to the first face.

An RF amplifier comprises a first ‘transconductance’ transistor (N.sub.CS) arranged to receive an RF input voltage (RFIN) at its gate terminal. A second ‘cascode’ transistor (N.sub.CG) has its source terminal connected to the drain terminal of the first transistor (N.sub.CS) at a node (MID). A feedback circuit portion is configured to measure a node voltage at the node (MID), to determine an average of the node voltage, to compare said average node voltage to a predetermined reference voltage (V.sub.BCG), and to generate a control voltage (CGGATE) dependent on the difference between the average node voltage and the predetermined reference voltage (V.sub.BCG). The feedback circuit portion applies the control voltage (CGGATE) to the gate terminal of the second transistor (N.sub.CG).

Methods and devices to support multiple gain states in amplifiers are described. The methods and devices are based on implementing a feedback element in the amplifier and adjusting the impedance of the feedback element to provide a desired gain while maintaining the overall performance of the amplifier and reducing degradation of the S12 parameter. The feedback element includes an adjustable attenuator and a tunable resistive element. The adjustable attenuator is provided in a path that is common to the feedback path and the bypass path of the amplifier. Exemplary implementations of adjustable attenuators are also presented.

The present invention discloses an audio processing circuit, wherein when the audio processing circuit determines that a signal being processed is a small signal, an output stage uses a regulated supply voltage provided by a voltage regulator, and the output stage uses an open-loop structure to reduce noise of an output audio signal; and when the audio processing circuit determines that the signal being processed is a large signal, the output stage directly uses the supply voltage without using the regulated supply voltage, and the output stage uses a closed-loop structure to reduce the total harmonic distortion of the output audio signal. By using the present invention, the audio processing circuit can have a good performance indicator with a small chip area design.

A dynamic amplifier includes a common-source amplifier configured to receive a gate voltage at a gate node and output a drain current to a drain node; a current mirror configured to mirror the drain current into an output current to an output current; a source capacitor connected to the source node; a load capacitor connected to the output node; a first switch configured to conditionally connect the gate node to an input voltage; a second switch configured to conditionally connect the gate node to a gate-resetting voltage; a third switch configured to conditionally connect the source node to a source-resetting voltage; a fourth switch configured to conditionally connect the drain node to a drain-resetting voltage; and a fifth switch configured to conditionally connect the output node to an output-resetting voltage.

According to one aspect, an integrated circuit includes a power amplifier having a succession of at least two amplifier stages. The two amplifier stages include a first amplifier stage configured to receive a radio frequency signal as input and a last amplifier stage configured to deliver as an output of an amplified radio frequency signal. The power amplifier further includes a safety circuit with a control circuit configured to compare the amplified radio frequency signal voltage with a threshold voltage. The safety circuit further comprises a gain reduction circuit configured to reduce a bias voltage of an upstream amplifier stage of the last amplifier stage when the amplified radio frequency signal voltage is greater than the threshold voltage.