US 12,249,978 B2
Isolated bootstrapped switch circuit
Gerd Trampitsch, Munich (DE); and Leon Alexander Loopik, ZH (NL)
Assigned to Analog Devices International Unlimited Company, Limerick (IE)
Filed by Analog Devices International Unlimited Company, Limerick (IE)
Filed on Sep. 16, 2022, as Appl. No. 17/932,878.
Prior Publication US 2024/0097670 A1, Mar. 21, 2024
Int. Cl. H03K 17/082 (2006.01); H03K 19/003 (2006.01)
CPC H03K 17/0822 (2013.01) [H03K 19/00315 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A bootstrapped switch circuit coupled to a timing circuit that provides one or more signals, the bootstrapped switch circuit having an input terminal and an output terminal, the bootstrapped switch circuit comprising:
a switch having a first terminal coupled to the input terminal, a second terminal coupled to the output terminal, and a control terminal, wherein the switch includes a diode coupled between a fourth terminal of the switch and the second terminal of the switch;
a charge pump coupled to the timing circuit, wherein a first terminal of the charge pump is coupled to the first terminal of the switch and a second terminal of the charge pump is coupled to the fourth terminal of the switch;
a logic circuit coupled to the timing circuit; and
a gain stage configured to operate in an isolated voltage domain, the gain stage coupled between an output of the logic circuit and the control terminal of the switch, wherein the gain stage has a gain greater than 1, and wherein, based on the output of the logic circuit, the gain stage is configured for providing negative to positive voltages between the first terminal of the switch and the control terminal of the switch.