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US 11,112,303 B2Granted
Measurement circuit and method therefor
AssigneeSemiconductor Components Industries, LLC
InventorsDieter Jozef Joos, Thomas Sevrin, Patrick Lepers
Life of this patent
Estimating the term…
Abstract
In embodiment, a measurement circuit forms a compensation signal that is representative of disturbances that are received while the measurement circuit is not receiving a signal to be measured, then the circuit removes the compensation signal from the measurement signal before measuring the value of the measurement signal.
Claims20
A measurement circuit comprising:
- a measurement channel circuit configured to receive an input signal from an input of the measurement circuit and measure a value of the input signal;
- a regulation circuit having a first switch configured to selectively couple the regulation circuit to regulate the input to a first value during a first time interval and to selectively decouple the regulation circuit from regulating the input during a second time interval wherein the measurement circuit receives a measurement signal at the input within the second time interval but not during the first time interval;
- a sampling circuit having a variable impedance circuit configured to selectively couple the sampling circuit to receive the input signal and to selectively increase an impedance of the variable impedance circuit to form a compensation signal that is representative of the input signal wherein the sampling circuit forms the compensation signal while the regulation circuit is regulating the input to the first value and wherein the sampling circuit is decoupled from receiving the input signal in response to the regulation circuit being decoupled from regulating the input;
- and
- the sampling circuit configured to selectively apply the compensation signal to the input for at least a portion of the second time interval wherein the measurement circuit receives the measurement signal to be measured at the input for the portion of the second time interval.
2 more elements
A measurement circuit comprising:
- a measurement channel circuit configured to receive an input signal from an input of the measurement circuit and measure a value of the input signal;
- a regulation circuit configured to regulate the input to a first value during a first time interval and to selectively not regulate the input to the first value during a second time interval;
- a sampling circuit configured to form substantially an average value of the input signal over a plurality of cycles of the input signal wherein the sampling circuit forms substantially the average value over at least a portion of the first time interval while the regulation circuit is regulating the input to the first value;
- and
- an output circuit of the sampling circuit configured to apply a first signal that is representative of substantially the average value to the input during a portion of the second time interval, the output circuit configured to decouple the input from receiving the first signal during the first time interval.
2 more elements
A method of forming a compensation circuit comprising:
- configuring the compensation circuit to receive, from an input, a first signal to be measured;
- configuring the compensation circuit to regulate the input to a first value for a first time interval while not receiving the first signal and to receive an input signal for the first time interval;
- configuring the compensation circuit to filter the input signal to form a sample signal in response to decreasing a cut-off frequency of a filter circuit from a first cut-off frequency to a second cut-off frequency over a portion of the first time interval;
- and
- configuring the compensation circuit to cease regulating the input to the first value and to apply a signal that is representative of the sample signal to the input for a second time interval wherein during at least a portion of the second time interval the compensation circuit is not regulating the input to the first value and the first signal is formed at the input thereby removing the sample signal from the first signal to form a compensated first signal.
2 more elements
Dependencies are inferred from the claim text.