Synthesizer and calibrating method for the same

Details Synthesizer and calibrating method for the same Synthesizer and calibrating method for the same

2007-02-20

2007-02-20

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S179000, C331S175000

Reexamination Certificate

active

11034484

ABSTRACT:
Synthesizer and calibrating method utilizing same. The frequency synthesizer modulates input signals comprising a phase locked loop circuit. The phase locked loop circuit comprises a phase frequency detector for generating a first signal, a low pass filter for outputting a filtered control signal derived from the received first signal, a voltage control oscillator for generating an output signal with a first frequency based on the control signal, a frequency divider dividing the first frequency for output to the input terminal of the phase frequency detector, a modulator coupled to the frequency divider, a pre-emphasis filter receiving and filtering the input signal for output to the modulator, and an auto loop gain calibration circuit, receiving the control signal, and calculating a current gain of the control signal in accordance with the voltage of the control signal to compensate for the frequency response mismatch between the pre-emphasis filter and the frequency synthesizer.

REFERENCES:
patent: 4864257 (1989-09-01), Vandegraaf
patent: 4965531 (1990-10-01), Riley
patent: 6008703 (1999-12-01), Perrott et al.
patent: 6515553 (2003-02-01), Filiol et al.
patent: 7005928 (2006-02-01), Albasini et al.
patent: 7015738 (2006-03-01), Cao

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