US 12,191,812 B2
Low off-leakage current switch
Yukihisa Handa, Arlington, MA (US); Kerry Brent Phillips, Haverhill, MA (US); and Matthew Thomas Juszkiewicz, Londonderry, NH (US)
Assigned to Analog Devices, Inc., Wilmington, MA (US)
Filed by Analog Devices, Inc., Wilmington, DE (US)
Filed on Mar. 17, 2022, as Appl. No. 17/697,711.
Claims priority of provisional application 63/196,635, filed on Jun. 3, 2021.
Prior Publication US 2022/0393645 A1, Dec. 8, 2022
Int. Cl. H03F 1/02 (2006.01); H03F 3/45 (2006.01)
CPC H03F 1/0205 (2013.01) [H03F 3/45475 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A low off-leakage switched gain trans-impedance amplifier (TIA) circuit having an input terminal to receive an input current, the switched gain TIA circuit comprising:
a first switch including a first transistor circuit coupled in series with a second transistor circuit via a first midpoint node, wherein a back-gate node of the second transistor circuit is coupled to the first midpoint node, and wherein the first switch has an ON state and an OFF state;
an amplifier circuit including an output node coupled to an input node of the first switch and an input node of a second switch; and
a bootstrapping circuit configured to receive a voltage and generate an output signal selectively coupleable to the first midpoint node to bias the first midpoint node to a representation of the voltage based on whether the first switch is in the OFF state,
wherein an output of the first switch is coupled to a first resistor in a first feedback path of the TIA circuit.