US 11,811,362 B1
Voltage controlled oscillator (VCO) with adaptive temperature compensation
Alberto Baldisserotto, Cary, NC (US); and Aida Varzaghani, San Jose, CA (US)
Assigned to Cadence Design Systems, Inc., San Jose, CA (US)
Filed by Cadence Design Systems, Inc., San Jose, CA (US)
Filed on Nov. 8, 2022, as Appl. No. 17/983,359.
Int. Cl. H03B 5/04 (2006.01); H03L 7/099 (2006.01); H03L 1/00 (2006.01); H03L 1/02 (2006.01)
CPC H03B 5/04 (2013.01) [H03L 1/00 (2013.01); H03L 1/02 (2013.01); H03L 7/099 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A system comprising:
a voltage controlled oscillator comprising:
a cross junction circuit electrically coupled to a temperature dependent input current;
an inductor circuit electrically coupled to the cross junction circuit;
a capacitor bank circuit electrically coupled to the inductor circuit;
an input node configured to receive a control voltage; and
an output node electrically coupled to the inductor circuit and configured to provide an oscillation frequency output, wherein the oscillation frequency output is controlled by the control voltage; and
an analog temperature dependent circuit electrically coupled to the voltage controlled oscillator via the cross junction circuit and configured to provide the temperature dependent input current, wherein the analog temperature dependent circuit comprises a bandgap voltage reference circuit, wherein the temperature dependent input current comprises a complementary-to-absolute temperature (CTAT) current, wherein the bandgap voltage reference circuit is configured to produce a proportional-to-absolute temperature (PTAT) current and a temperature invariant current, and wherein the CTAT current is derived by subtracting the PTAT current from the temperature invariant current.