Patent ID: 11959995
Assignee: STMICROELECTRONICS S.R.L.
Field: Basic communication processes (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 15:
16. A method of operating a circuit, the method comprising:
biasing a tunable resonant circuit to generate a variable-frequency output signal between a first node and a second node;
generating a first digital control signal and a second digital control signal as a function of an input reference signal and said variable-frequency output signal, wherein said first digital control signal being asserted is indicative of a first operational state wherein a timing offset of said variable-frequency output signal with respect to said input reference signal has a first sign and wherein said second digital control signal being asserted is indicative of a second operational state wherein said timing offset has a second sign opposite said first sign;
generating a control signal as a function of said first digital control signal and said second digital control signal;
receiving said control signal at a control node coupled to a variable capacitance and tuning said tunable resonant circuit as a function of said control signal,
sensing a reset signal and generating a timing signal, wherein said timing signal is asserted in response to a pulse sensed in said reset signal and de-asserted after a time interval from said sensed pulse; and
selectively coupling, between said first node and said second node, selected capacitances from said set of capacitances as a function of said second digital control signal, in response to said timing signal being asserted.