Patent ID: 9312810
Filing Date: 2016-04-12
CPC Classification: H03B

Claim Text:
1. A complementary Colpitts voltage-controlled oscillator comprising: a first circuit having a first PMOS transistor, a first current source, a first capacitor, and a second capacitor; a second circuit having a first NMOS transistor, a second current source, a third capacitor, and a fourth capacitor; and a first transformer and a second transformer arranged between the first circuit and the second circuit, wherein one end of a primary winding of the first transformer is connected with a gate electrode of the first PMOS transistor; one end of a secondary winding of the first transformer is connected with a drain electrode of the first PMOS transistor; the other end of the primary winding of the first transformer and the other end of the secondary winding of the first transformer are connected with a node A corresponding to an AC ground; and wherein one end of a primary winding of the second transformer is connected with a gate electrode of the first NMOS transistor; one end of a secondary winding of the second transformer is connected with a drain electrode of the first NMOS transistor; and the other end of the primary winding of the second transformer and the other end of the secondary winding of the second transformer are connected with the node A.