US 12,308,847 B2
Dual loop charge pump for enhanced reliability and power consumption
James Strom, Rochester, MN (US); John Borkenhagen, Rochester, MN (US); Ann Chen Wu, Hopewell Junction, NY (US); and Rashmi Bindu, Austin, TX (US)
Assigned to International Business Machines Corporation, Armonk, NY (US)
Filed by International Business Machines Corporation, Armonk, NY (US)
Filed on Jun. 21, 2023, as Appl. No. 18/338,492.
Prior Publication US 2024/0429924 A1, Dec. 26, 2024
Int. Cl. H03L 7/089 (2006.01); H03L 7/087 (2006.01); H03L 7/099 (2006.01)
CPC H03L 7/0895 (2013.01) [H03L 7/087 (2013.01); H03L 7/099 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A charge pump circuit comprising:
an H-bridge circuit; an input of the H-bridge circuit coupled to a phase frequency detector to receive respective increment and decrement control signals from the phase frequency detector;
an output of the H-bridge circuit coupled to a loop filter to control current flow to and from the loop filter based on the respective increment and decrement control signals;
a first loop control comprising a sense operational amplifier coupled to the H-bridge circuit, wherein the sense operational amplifier provides an output configured to drive a pair of H-bridge footer transistors providing a charge pump current to match respective voltages at a first charge pump node and a second charge pump node; and
a second loop control coupled to the H-bridge circuit configured to drive an H-bridge header transistor to adjust a common mode voltage at the second charge pump node and a third charge pump node, the second charge pump node and the third charge pump node coupled to the loop filter.