Complementary Colpitts voltage controlled oscillator with low power and low phase noise

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.