US 11,844,157 B2
Current control circuitry
Dave Smith, Edinburgh (GB); Saurabh Singh, Edinburgh (GB); Andrew Buist, Edinburgh (GB); Paulius Cerebiejus, Edinburgh (GB); Mark J. McCloy-Stevens, Edinburgh (GB); and Terence A. Orr, Edinburgh (GB)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Jul. 8, 2022, as Appl. No. 17/860,918.
Application 17/860,918 is a continuation of application No. 17/123,429, filed on Dec. 16, 2020, granted, now 11,477,868.
Claims priority of provisional application 62/982,788, filed on Feb. 28, 2020.
Claims priority of provisional application 62/959,350, filed on Jan. 10, 2020.
Prior Publication US 2022/0353970 A1, Nov. 3, 2022
Int. Cl. H05B 45/345 (2020.01); H03F 3/04 (2006.01)
CPC H05B 45/345 (2020.01) [H03F 3/04 (2013.01); H03F 2200/129 (2013.01)] 19 Claims
OG exemplary drawing
 
1. Current control circuitry for controlling a current through a load, the current control circuitry comprising:
amplifier circuitry;
reference voltage generator circuitry configured to supply a fixed reference voltage to a first input of the amplifier circuitry;
an output stage comprising:
a control terminal coupled to an output of the amplifier circuitry;
a current input terminal configured to be coupled to the load; and
a current output terminal;
a clock-controlled variable resistance coupled to the current output terminal of the output stage, wherein a resistance of the variable resistance is based on a digital code input to the variable resistance; and
a feedback path between the current output terminal of the output stage and a second terminal of the amplifier circuitry for providing a feedback voltage to a second input of the amplifier circuitry.