Patent ID: 9590646
Date: 2017-03-07
CPC Classifications: H03B,H03K,H03L

Claim:
1. A frequency synthesizer system for producing a radio frequency (RF) signal with an RF frequency that is responsive to a frequency reference (FREF) clock, the system comprising: an inductive-capacitive (LC) tank oscillator circuit configured to generate the RF signal; a digital to time converter (DTC) circuit configured to operate, for a first edge of the FREF clock, in a baseline mode that introduces a first delay value to the FREF clock, and for a subsequent edge of the FREF clock, in a delay mode that introduces a second delay value to the FREF clock; a controller circuit configured to enable the LC-tank oscillator circuit in response to a first edge of the FREF clock and to set the second delay value as a function of the frequency of the RF signal; and a phase detector circuit configured to detect, for the subsequent edges of the FREF clock and with the delay of the DTC circuit, a phase difference between the FREF clock and the RF signal.