US 11,689,156 B1
Voltage-controlled oscillator and method for using the same
Giuseppe Papotto, Biancavilla (IT); Alessandro Parisi, Mascalucia (IT); Andrea Cavarra, Catania (IT); and Giuseppe Palmisano, S. Giovanni la Punta (IT)
Assigned to STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed by STMicroelectronics S.r.l., Agrate Brianza (IT)
Filed on Dec. 7, 2021, as Appl. No. 17/643,068.
Int. Cl. H03B 5/12 (2006.01)
CPC H03B 5/124 (2013.01) [H03B 5/1215 (2013.01); H03B 5/1265 (2013.01); H03B 2200/004 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A voltage controlled oscillator (VCO) circuit comprising:
a pair of inductors coupled in series;
a first pair of varactors coupled in series, a first common mode node being between the respective varactors of the first pair of varactors;
a second pair of varactors coupled in series, a second common mode node being between the respective varactors of the second pair of varactors,
a first terminal of the first pair of varactors being coupled to a first terminal of the second pair of varactors and a first terminal of the pair of inductors, and
a second terminal of the first pair of varactors being coupled to a second terminal of the second pair of varactors and a second terminal of the pair of inductors; and
a supply voltage node switchably coupled to the first common mode node through a first switch, the supply voltage node being a node located between the pair of inductors.