Abstract: A measurement circuit comprises an input terminal to receive a current signal, a first circuit branch coupled to the first terminal and including one or more circuit elements to receive a portion of the current signal, a second circuit branch coupled to the first terminal and including one or more additional circuit elements to receive another portion of the current signal, a nonlinear circuit element coupling the first circuit branch to the second circuit branch, and a quantization circuit configured to produce an input current measurement of current in the first and second circuit branches, and to include current in the second circuit branch in the input current measurement according to a magnitude of the input current signal.

Abstract: A measurement circuit comprises an input terminal to receive a current signal, a first circuit branch coupled to the first terminal and including one or more circuit elements to receive a portion of the current signal, a second circuit branch coupled to the first terminal and including one or more additional circuit elements to receive another portion of the current signal, a nonlinear circuit element coupling the first circuit branch to the second circuit branch, and a quantization circuit configured to produce an input current measurement of current in the first and second circuit branches, and to include current in the second circuit branch in the input current measurement according to a magnitude of the input current signal.

Abstract: A measurement circuit comprises an electronic circuit, multiple measurement channels, and a combining circuit. The electronic circuit includes a first terminal, a second terminal, and a non-resistive circuit element. Each of the multiple measurement channels includes a differential input connected to the electronic circuit. The differential inputs of the multiple measurement channels are connected in series and include a differential input coupled to the non-resistive circuit element. One input of a differential input of a first measurement channel of the multiple measurement channels is connected to the first terminal of the electronic circuit and one input of a differential input of a second measurement channel of the multiple measurement channels is connected to the second terminal of the electronic circuit. The combining circuit receives multiple outputs from the multiple measurement channels and produce a composite output signal.

Abstract: A device to reduce distortion in an amplifier includes an input transistor configured to generate a voltage based on an input signal. The device further includes a diode connected transistor that is configured to sink the current. The diode connected transistor includes an output terminal, and a control terminal, where the output terminal is coupled to a control terminal. The device further includes a current source circuit that coupled to the control terminal. The device additionally includes an impedance element that coupled to the output terminal at a first node and to the control terminal and the current source circuit at a second node.

Abstract: A device to reduce distortion in an amplifier includes an input transistor configured to generate a voltage based on an input signal. The device further includes a diode connected transistor that is configured to sink the current. The diode connected transistor includes an output terminal, and a control terminal, where the output terminal is coupled to a control terminal. The device further includes a current source circuit that coupled to the control terminal. The device additionally includes an impedance element that coupled to the output terminal at a first node and to the control terminal and the current source circuit at a second node.

Abstract: A measurement circuit comprises an electronic circuit, multiple measurement channels, and a combining circuit. The electronic circuit includes a first terminal, a second terminal, and a non-resistive circuit element. Each of the multiple measurement channels includes a differential input connected to the electronic circuit. The differential inputs of the multiple measurement channels are connected in series and include a differential input coupled to the non-resistive circuit element. One input of a differential input of a first measurement channel of the multiple measurement channels is connected to the first terminal of the electronic circuit and one input of a differential input of a second measurement channel of the multiple measurement channels is connected to the second terminal of the electronic circuit. The combining circuit receives multiple outputs from the multiple measurement channels and produce a composite output signal.

Abstract: A system is configured and a method is provided for receiving an input ratio represented by a first input signal and a second input signal, and producing an output ratio represented by a first output signal and a second output signal. The system is constructed and the method is provided for alternately operating in at least two time periods, wherein in one time period the first input signal, a low accuracy amplifier, and the first output signal are selectively coupled, and in another time period the input signal, the low accuracy amplifier, a high accuracy attenuator, and the second output signal are selectively coupled so as to maintain the output ratio proportional to the input ratio.

Abstract: A system is configured and a method is provided for receiving an input ratio represented by a first input signal and a second input signal, and producing an output ratio represented by a first output signal and a second output signal. The system is constructed and the method is provided for alternately operating in at least two time periods, wherein in one time period the first input signal, a low accuracy amplifier, and the first output signal are selectively coupled, and in another time period the input signal, the low accuracy amplifier, a high accuracy attenuator, and the second output signal are selectively coupled so as to maintain the output ratio proportional to the input ratio.

Abstract: Circuits and methods that improve the performance of voltage reference driver circuits and associated analog to digital converters are provided. A voltage reference driver circuit that maintains a substantially constant output voltage when a load current is modulated by an input signal is provided. The voltage reference driver circuit synchronously decouples a voltage regulation circuit from the load circuit when modulating events such as pulses caused by the load circuit during a switching interval are generated, preventing disturbance of the regulation circuitry and keeping its output voltage substantially constant.

Abstract: Systems and methods for reducing the magnitude of signal dependent capacitance are provided. Capacitance canceling circuitry is operative to generate cancellation capacitance in response to the magnitude of a signal, which may be the same signal that produces the undesired signal dependent capacitance, to at least partially cancel the signal dependent capacitance.

Abstract: Circuits and methods that improve the performance of voltage reference driver circuits and associated analog to digital converters are provided. A voltage reference driver circuit that maintains a substantially constant output voltage when a load current is modulated by an input signal is provided. The voltage reference driver circuit synchronously decouples a voltage regulation circuit from the load circuit when modulating events such as pulses caused by the load circuit during a switching interval are generated, preventing disturbance of the regulation circuitry and keeping its output voltage substantially constant.

Abstract: A CMOS switch with compensation circuitry that maintains linearized gate capacitance, said switch capable of selectively processing a signal independent of changes to gate capacitance current. The switch passes signals which are substantially insensitive to changes in source impedance. Thus, the switch processes an analog signal with a minimum of distortion as a result of gate capacitance currents.

Abstract: A full differential sample and hold circuit for an analog to digital converter. The sample and hold circuit samples and holds the differential signal resulting from two input signals. The sample and hold circuit includes a comparator, two differential capacitors and a common mode sample and hold circuit. The comparator has two input terminals and an output terminal. Each of the differential capacitors corresponds to one of the input signals and has an input terminal adapted for selective coupling to the respective input signal. Each of the differential capacitors has an output terminal electrically coupled to a different input terminal of the comparator. The common mode sample and hold circuit is disposed between the input terminals of the two differential capacitors. In one embodiment, the common mode sample and hold circuit comprises two common mode capacitors.

Abstract: A multiple channel analog to digital converter utilizing common conversion circuitry for converting multiple analog signals into corresponding digital signals. The converter includes an input stage having a plurality of capacitors, each one corresponding to one of the analog signals. The capacitors sample the respective analog signals and are successively coupled to common conversion circuitry, including a CDAC and a comparator. The CDAC iteratively increments or decrements the voltage of a selected one of the sampled analog signals for comparison to a reference voltage by the comparator. The comparator output is latched by a successive approximation register to provide a parallel output signal which is fed back to control the CDAC.