Patent ID: 11860199
Assignee: DIALOG SEMICONDUCTOR (UK) LIMITED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An apparatus comprising a first current sensor for a switching converter comprising an inductor and a first switch, the first switch being arranged to selectively couple the inductor to a first voltage, the first current sensor being configured to:
i) generate a first output current that is dependent on an inductor current flowing through the inductor; and
ii) at least partially compensate for an error arising due to the first switch in the generation of the first output current, wherein;
the first current sensor comprises a first stage configured to generate a first current that is dependent on the inductor current, the first current comprising a current error, the current error resulting from the error arising due to the first switch; and
a second stage configured to:
i) receive the first current; and
ii) generate the first output current by at least partially compensating for the current error of the first current and wherein the first stage comprises:

a first differential amplifier;
a first resistive element;
a second resistive element configured to be couplable to the first switch in a parallel coupling configuration, wherein:
the first differential amplifier is configured to generate the first current that is dependent on the impedances of the first resistive element, the second resistive element and the first switch, wherein:

an output of the first differential amplifier is coupled to a gate of a first transistor a negative input of the first differential amplifier is coupled to a first terminal of the first transistor.