US 11,870,450 B1
Jitter and reference spur management with adaptive gain by voltage controlled oscillator calibration
Yueh Chun Cheng, Cupertino, CA (US); and Xuan Wang, San Jose, CA (US)
Assigned to Ambarella International LP, Santa Clara, CA (US)
Filed by Ambarella International LP, Santa Clara, CA (US)
Filed on Mar. 1, 2022, as Appl. No. 17/683,613.
Int. Cl. H03L 7/06 (2006.01); H03L 7/099 (2006.01); H03L 7/089 (2006.01)
CPC H03L 7/0992 (2013.01) [H03L 7/0893 (2013.01); H03L 7/0995 (2013.01); H03L 2207/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a first circuit configured to generate an output signal having a first frequency in response to a voltage level of a first input signal and a value of a second input signal; and
a second circuit configured to perform a calibration operation to determine the value of the second input signal by (i) setting the voltage level of the first input signal to a reference voltage level and (ii) adjusting the value of the second input signal based on a reference frequency signal having a second frequency, said output signal having the first frequency, and a value of a third input signal representing a target frequency for said put signal.