The present invention provides an amplifier circuit, wherein the amplifier circuit includes an input terminal, a capacitor, an amplifier, a feedback circuit and an aliasing tone cancellation circuit. The input terminal is configured to receive a first input signal. The capacitor is coupled to the input terminal. The amplifier is configured to receive the input signal through the capacitor to generate an output signal. The feedback circuit is coupled between an input node and an output node of the amplifier, and is configured to generate a feedback signal according to the output signal, wherein the feedback circuit includes a storage block including a switched-capacitor. The aliasing tone cancellation circuit is coupled between the input terminal of the amplifier circuit and the input node of the amplifier, and configured to generate a signal to cancel or reduce an aliasing tone of the feedback signal according to the input signal.

The disclosure relates to an alternating current (AC) coupling circuit including first and second capacitors having first and second input terminals configured to receive an input differential signal and generate an output differential signal at first and second output terminals of the first and second capacitors. The AC coupling circuit further includes a baseline wander correction circuit configured to make the output differential signal resistant to baseline wander due to the input differential signal including one or more time intervals of unbalanced data. The baseline wander correction circuit includes a differential difference amplifier (DDA) having a first differential input configured to receive the input differential signal, a differential output configured to generate a compensation differential signal, and a second differential input configured to receive the compensation differential signal. The compensation differential signal is applied to the output terminals of the first and second capacitors via a pair of resistors, respectively.

A power amplifier arrangement comprises a power amplifier comprising at least one transistor having a first gate and a second gate. The first gate is configured to receive a radio frequency input signal superimposed with a first control signal, and the second gate is configured to receive a second control signal. The first control signal is a linearization signal varying in relation to an envelope of the input signal and the second control signal is a temperature compensation signal varying in relation to a temperature of the power amplifier, or vice versa.

A system, disposed within a wearable hearing device, includes a sound producing device (SPD) driven by a driving voltage, a first sound sensing device, and a subtraction circuit. The first sound sensing device is configured to sense a combined sound pressure produced at least by the SPD and generate a sensed signal accordingly. The subtraction circuit has a first input terminal, a second input terminal, and a first output terminal. The first input terminal is coupled to the first sound sensing device, and the first output terminal is coupled to the SPD. A first phase delay between the driving voltage and the sensed signal is less than 60°.

A system, disposed within a wearable hearing device, includes a sound producing device (SPD) driven by a driving voltage, a first sound sensing device, and a subtraction circuit. The first sound sensing device is configured to sense a combined sound pressure produced at least by the SPD and generate a sensed signal accordingly. The subtraction circuit has a first input terminal, a second input terminal, and a first output terminal. The first input terminal is coupled to the first sound sensing device, and the first output terminal is coupled to the SPD. A first phase delay between the driving voltage and the sensed signal is less than 60°.

The present disclosure relates to a differential input circuit, an amplifier circuit, and a display device. The differential input circuit comprises: a first power module, a second power module, a first shunt module, a second shunt module, a first output module, and a second output module. The first power module is controlled to output a first signal, a second signal, and a third signal through a first bias signal, and the second power module receives the first signal, and outputs a fourth signal and a fifth signal through a differential input signal. The first shunt module, the second shunt module, the first output module, and the second output module are controlled by the differential input signal so that the first output module and the second output module output signals under the control of the differential input signal.

An operational amplifier is disclosed. The operational amplifier activates/couples either a first or a second differential pair of transistors to an input based on the input voltage. The first and second pair of transistors are each biased with a current having a first portion that is constant with temperature and a second portion that is proportional to temperature. By adjusting the ratios of the first and second portions, the transconductance of each differential pair may be made relatively constant with temperature. Each differential pair is coupled to a trim current source that is adjusted to reduce the voltage offset at each output. The resulting voltage offset for the operational amplifier is relatively constant over a range of input voltages and has temperature coefficient unaffected by the trimming process.

The present disclosure relates to a differential input circuit, an amplifier circuit, and a display device. The differential input circuit comprises: a first power module, a second power module, a first shunt module, a second shunt module, a first output module, and a second output module. The first power module is controlled to output a first signal, a second signal, and a third signal through a first bias signal, and the second power module receives the first signal, and outputs a fourth signal and a fifth signal through a differential input signal. The first shunt module, the second shunt module, the first output module, and the second output module are controlled by the differential input signal so that the first output module and the second output module output signals under the control of the differential input signal.

A power amplifier arrangement comprises a power amplifier comprising at least one transistor having a first gate and a second gate. The first gate is configured to receive a radio frequency input signal superimposed with a first control signal, and the second gate is configured to receive a second control signal. The first control signal is a linearization signal varying in relation to an envelope of the input signal and the second control signal is a temperature compensation signal varying in relation to a temperature of the power amplifier, or vice versa.

An operational amplifier is disclosed. The operational amplifier activates/couples either a first or a second differential pair of transistors to an input based on the input voltage. The first and second pair of transistors are each biased with a current having a first portion that is constant with temperature and a second portion that is proportional to temperature. By adjusting the ratios of the first and second portions, the transconductance of each differential pair may be made relatively constant with temperature. Each differential pair is coupled to a trim current source that is adjusted to reduce the voltage offset at each output. The resulting voltage offset for the operational amplifier is relatively constant over a range of input voltages and has temperature coefficient unaffected by the trimming process.