Patent ID: 9088290
Filing Date: 2015-07-21
Classification: H03B,H03L

Abstract:
1. An LC oscillator process compensation circuit, comprising: an LC oscillator, the LC oscillator comprising a gain stage, an inductor and two voltage-controlled capacitors, the gain stage comprising a first Field Effect Transistor, a second Field Effect Transistor, a third Field Effect Transistor and a fourth Field Effect Transistor, and the gain stage having two voltage output terminals each of which is connected with a voltage-controlled capacitor, and the inductor being connected between the two voltage output terminals; a reference voltage terminal; a follower, connected with the reference voltage terminal and arranged for providing a working voltage for the LC oscillator, and the follower further comprising a detection circuit which is arranged for detecting current changes of the gain stage; and a current auxiliary circuit, connected with an external power source and the follower respectively to provide a working current for the follower; wherein the follower comprises a fifth Field Effect Transistor, a sixth Field Effect Transistor, a seventh Field Effect Transistor and the detection circuit, and a drain of the fifth Field Effect Transistor is connected with the current auxiliary circuit, a gate of the fifth Field Effect Transistor is connected with a source of the sixth Field Effect Transistor, a source of the fifth Field Effect Transistor is connected with a drain of the first Field Effect Transistor and one terminal of the detection circuit respectively, a gate of the sixth Field Effect Transistor is connected with the reference voltage terminal, a drain of the sixth Field Effect Transistor is connected with a drain of the seventh Field Effect Transistor, a source of the seventh Field Effect Transistor is grounded, a gate of the seventh Field Effect Transistor is connected with the detection circuit, and the other terminal of the detection circuit is grounded.