LC OSCILLATOR PROCESS COMPENSATION CIRCUIT

摘要

An LC oscillator process compensation circuit includes an LC oscillator, a reference voltage terminal, a follower and a current auxiliary circuit, the LC oscillator includes a gain stage, an inductor and two voltage-controlled capacitors, the gain stage includes a first Field Effect Transistor, a second Field Effect Transistor, a third Field Effect Transistor and a fourth Field Effect Transistor, the current auxiliary circuit is connected with an external power source and the follower that connected with the reference voltage terminal to provide a working voltage for the LC oscillator, the follower includes a detection circuit to detecting current changes of the gain stage. The LC oscillator process compensation circuit has simple circuit structure and eliminates frequency changes of the LC oscillator caused by the process variations of the gain stage, thereby ensuring stability of the frequency of the LC oscillator, improving work precision and reducing design difficult.

主权项

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.