US 11,835,554 B2
Current sensing circuitry
Dipankar Nag, Newbury (GB); Peter Hsu, Edinburgh (GB); Kapil R. Sharma, Edinburgh (GB); Gordon J. Bates, Edinburgh (GB); Simon R. Foster, Reading (GB); and Mark J. McCloy-Stevens, Edinburgh (GB)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Dec. 21, 2020, as Appl. No. 17/129,113.
Claims priority of provisional application 63/014,303, filed on Apr. 23, 2020.
Prior Publication US 2021/0333310 A1, Oct. 28, 2021
Int. Cl. G01R 19/25 (2006.01); H03F 3/45 (2006.01); G01R 19/00 (2006.01)
CPC G01R 19/2509 (2013.01) [H03F 3/45475 (2013.01); G01R 19/0053 (2013.01); H03F 2200/129 (2013.01); H03F 2200/171 (2013.01); H03F 2203/45116 (2013.01)] 20 Claims
OG exemplary drawing
 
1. Current sensing circuitry, comprising:
a differential amplifier comprising first and second inputs configured to sense a current across a sense resistance, and an output configured to output a current sense signal;
a first current source;
a second current source; and
a switch network operable in:
a first phase in which the first current source is connected to the first input and disconnected from the output, and the second current source is connected to the output and disconnected from the first input; and
a second phase in which the first current source is connected to the output and disconnected from the first input, and the second current source is connected to the first input and disconnected from the output.