Automatic biasing scheme for reducing oscillator phase noise

Details Automatic biasing scheme for reducing oscillator phase noise Automatic biasing scheme for reducing oscillator phase noise

1998-02-27

2000-05-16

Kinkead, Arnold

Oscillators

Solid state active element oscillator

Transistors

331 74, 331109, 331175, 331183, 331186, H03B 508

Patent

active

060642777

ABSTRACT:
A drive circuit for an oscillator having an LC tank reduces phase noise by maximizing the oscillation amplitude and minimizing the drive to the tank. The drive circuit utilizes a capacitive attenuator network for level shifting the oscillation signal before feeding it back to the drive transistors in the drive circuit, thereby allowing a large peak voltage swing across the tank without saturating the transistors. An adaptive control circuit controls the biasing of the drive transistors and reduces the drive to the tank when the maximum oscillation amplitude is reached so that the drive circuit replenishes just the minimum amount of energy lost in the tank during each cycle, thereby minimizing the coupling of active circuit noise into the tank.

REFERENCES:
patent: 3815048 (1974-06-01), Hamlet
patent: 3824491 (1974-07-01), Treadway
patent: 4918406 (1990-04-01), Baumbach et al.
patent: 5818306 (1998-10-01), Lee et al.

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