US 12,237,817 B2
Programmable gain amplifier with active charge-injection/charge-leakage suppression
Dexue Zhang, Arcadia, CA (US)
Assigned to Gigajot Technology, Inc., Glendale, CA (US)
Filed by Gigajot Technology, Inc., Glendale, CA (US)
Filed on Apr. 8, 2024, as Appl. No. 18/629,835.
Application 18/629,835 is a continuation of application No. 17/306,836, filed on May 3, 2021, granted, now 11,979,126.
Claims priority of provisional application 63/019,953, filed on May 4, 2020.
Prior Publication US 2024/0275351 A1, Aug. 15, 2024
Int. Cl. H03F 3/45 (2006.01); H03G 3/30 (2006.01)
CPC H03G 3/30 (2013.01) [H03F 3/45475 (2013.01); H03G 2201/103 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An integrated circuit, comprising:
an amplifier circuit;
a switching circuit configured to:
precharge, during a precharge phase, a first capacitor coupled between an input signal and an input node of the amplifier circuit; and
isolate the input node of the amplifier circuit during an active phase so that an output of the amplifier circuit is proportional to a ratio of the first capacitor and a second capacitor coupled between the output of the amplifier circuit and the input node of the amplifier circuit; and
wherein the switching circuit comprises a low-impedance charge expulsion path to reduce charge injection from the switching circuit to the input node of the amplifier circuit when transitioning from the precharge phase to the active phase, and to reduce charge leakage from the switching circuit to the input node of the amplifier circuit during the active phase.