US 12,463,630 B2
Voltage boosted transmitter without a negative rail
Ercem Yesil, San Diego, CA (US); Patrick Isakanian, El Dorado Hills, CA (US); and Kevin Jia-Nong Wang, Poway, CA (US)
Assigned to QUALCOMM INCORPORATED, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jan. 2, 2024, as Appl. No. 18/402,568.
Prior Publication US 2025/0219631 A1, Jul. 3, 2025
Int. Cl. H03K 17/0412 (2006.01); H03K 17/06 (2006.01); H03K 17/687 (2006.01)
CPC H03K 17/04123 (2013.01) [H03K 17/063 (2013.01); H03K 17/687 (2013.01); H03K 2217/0081 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system, comprising:
a driver including a pull-up p-type field effect transistor (PFET);
a negative boost circuit comprising:
a first drive circuit configured to receive a first supply voltage;
a second drive circuit configured to receive a second supply voltage different from the first supply voltage;
a switch coupled between an output of the second drive circuit and a gate of the pull-up PFET, wherein the switch is configured to turn on when the output of the second drive circuit is driven high, and turn off when the output of the second drive circuit is driven low; and
a capacitor having a first terminal and a second terminal, wherein the first terminal is coupled to the gate of the pull-up PFET and the second terminal is coupled to an output of the first drive circuit; and
a pre-drive circuit configured to drive an input of the first drive circuit and an input of the second drive circuit based on an input signal.