US 2022/0276285 A1 · CURRENT SENSING

Abstract

This application relates to current sensing, in particular for a signal processing circuit (500) for outputting an output signal (Sout) based on an input signal (Sin). An output stage (101) includes an output transistor (102) driven, in use, by a drive signal. A current monitor (501) is configured to monitor, in use, a first current through the output transistor, wherein the current monitor comprises a current sensor (105) having a sense transistor (106) configured to be driven based on the drive signal so as to generate a sense current related to the first current. A compensation controller (301) receives an indication of signal level of the input signal and controllably varies operation of the current monitor (501) so as to at least partially compensate for signal-dependent variation in a relationship between the first current and the first sense current.

Claims20

Dependent claims

A signal processing circuit configured to output an output signal based on an input signal comprising:

an output stage comprising a first transistor driven, in use, by a first drive signal;
a current monitor configured to monitor a first current through said first transistor, wherein the current monitor comprises a first current sensor having a first sense transistor configured to be driven based on said first drive signal so as to generate a first sense current related to the first current;
and
a compensation controller configured to receive an indication of signal level of the input signal and controllably vary operation of the current monitor based on said indication of signal level so as to at least partially compensate for signal-dependent variation in a relationship between the first current and the first sense current.

1 more element

Dependencies are inferred from the claim text.

Current sensing

Life of this patent

Current sensing

Life of this patent

Abstract

Claims20