Patent ID: 9654120
Date: 2017-05-16
CPC Classifications: G01R,H03B,H03L

Claim:
1. A method comprising: generating a first signal based on a difference between a first frequency of a first voltage controlled oscillator (VCO) and a second frequency of a second VCO, wherein the first VCO is a separate VCO than the second VCO, and wherein the first VCO generates a first VCO output signal having the first frequency and the second VCO generates a second VCO output signal having the second frequency based on a same reference signal; determining a first gain of the first VCO at least partially based on the first signal; and unlocking a first phase lock loop (PLL) associated with the first VCO to an open loop configuration, wherein unlocking the first PLL includes opening a feedback path of the first PLL with respect to an input of a phase frequency detector of the first PLL, wherein opening the feedback path disables loop feedback to the phase frequency detector, wherein the first VCO output signal is generated while the first PLL is unlocked to the open loop configuration.