An ultrasound circuit comprising a single-ended trans-impedance amplifier (TIA) is described. The TIA is coupled to an ultrasonic transducer to amplify an electrical signal generated by the ultrasonic transducer in response to receiving an ultrasound signal. The TIA is followed by further processing circuitry configured to filter, amplify, and digitize the signal produced by the TIA.

An ultrasound circuit comprising a trans-impedance amplifier (TIA) with built-in time gain compensation functionality is described. The TIA is coupled to an ultrasonic transducer to amplify an electrical signal generated by the ultrasonic transducer in response to receiving an ultrasound signal. The TIA is, in some cases, followed by further analog and digital processing circuitry.

According to one embodiment, a signal processing circuit includes a first voltage setting circuit that sets a reference voltage on an input side of an isolator, a variable gain amplifier circuit that amplifies an output signal of the isolator, a DC offset adjustment circuit that adjusts an offset of the variable gain amplifier circuit, a second voltage setting circuit that sets a reference voltage on an output side of the isolator, and a control circuit that controls the DC offset adjustment circuit in response to a result of comparison of an output voltage of the variable gain amplifier circuit with an output voltage of the second voltage setting circuit.

The present invention provides an amplifier circuit, wherein the amplifier circuit includes an operational amplifier and a feedback path. The operational amplifier has an input terminal and an output terminal, and is arranged for receiving an input signal to generate an output signal. The feedback path is coupled between the input terminal and the output terminal of the operational amplifier, wherein the feedback path comprises at least two poly resistors, and a depletion region of at least one of the two poly resistors is biased by the output signal generated by the operational amplifier.

Assemblies of electronic components for reception of data using optical fibre and methods for providing same. Assemblies comprise a photodiode; an amplifier coupled to the photodiode; at least one feedback resistor coupled between the input and output of the amplifier; an arrangement of at least two MOS transistors of same channel polarity and configured in parallel with the feedback resistor(s); a system for sensing received input signal level and applying a bias voltage to gates of the MOS transistors, the bias voltage varied according to the received input signal level to control a resistance apparent through the arrangement of MOS transistors; at least one capacitor configured to couple signals from the amplifier output to a gate of at least one of the MOS transistors; and at least one bias resistor configured to couple the bias voltage to a gate of at least one of the MOS transistors.

A pseudo resistor with tunable resistance including a first transistor and a second transistor is provided. The first transistor has a first terminal, a second terminal and a control terminal. The first terminal of the first transistor serves as a first terminal of the pseudo resistor. The control terminal of the first transistor receives a control voltage. The first transistor is controlled by the control voltage, such that the first transistor operates in a weak inversion region. The second transistor has a first terminal, a second terminal and a control terminal. The first terminal of the second transistor is coupled to the second terminal of the first transistor. The second terminal of the second transistor and the control terminal of the second transistor are coupled to each other to serve as a second terminal of the pseudo resistor with tunable resistance. The second transistor operates in the weak inversion region.

Disclosed is a differential voltage supplying apparatus configured to supply, to a neural activity recorder, an input signal generated by combining, with a direct current (DC) power supply, a common-mode signal determined from a voltage applied to a detection electrode and a reference electrode connected to the neural activity recorder, and improve a common-mode rejection ratio of the neural activity recorder and generate a DC power supply.

An amplifier for a receiver circuit is disclosed. The amplifier has an input node (V.sub.in) and an output node (V.sub.out). It comprises a tunable tank circuit connected to the output node (V.sub.out), a feedback circuit path connected between the output node (V.sub.out) and the input node (V.sub.in), and a tunable capacitor connected between an internal node of the feedback circuit path and a reference-voltage node. A receiver circuit and a communication apparatus is disclosed as well.

An impedance circuit includes a poly-resistor and a controller. The poly-resistor has a first terminal and a second terminal. The controller generates a first control voltage and a second control voltage. The resistance between the first terminal and the second terminal of the poly-resistor is determined according to the first control voltage and the second control voltage. The second control voltage is different from the first control voltage. The proposed impedance circuit can improve the linearity of the poly-resistor.

Disclosed herein is an amplifier, comprising: an op-amp configured to receive at an input thereof a first electric current; a first MOS capacitor connected to the input and an output of the op-amp.