Method and apparatus for optimizing an oscillator start up time

Details Method and apparatus for optimizing an oscillator start up time Method and apparatus for optimizing an oscillator start up time

1997-09-12

1998-12-01

Grimm, Siegfried H.

Oscillators

Electromechanical resonator

Crystal

331177V, 331179, H03B 532, H03L 300

Patent

active

058444483

ABSTRACT:
An oscillator circuit (10) having an optimized start up time includes an inverting amplifier (12) coupled in parallel to a crystal (14), a first bank of capacitors (16) coupled to the crystal, and a second bank of capacitors (20) switchably coupled (18) in parallel to the frequency resonant network, wherein the second bank of capacitors has a higher capacitance load than the first bank of capacitors. The oscillator circuit may also include a processor (62) for controlling when the second bank of capacitors gets switched and coupled to the crystal.

REFERENCES:
patent: 4896122 (1990-01-01), Tahernia et al.
patent: 5030926 (1991-07-01), Walden
patent: 5349309 (1994-09-01), Fujii
patent: 5493715 (1996-02-01), Humphreys et al.
patent: 5534826 (1996-07-01), Logan
Andreas Rusznyak, "Start-Up Time of CMOS Oscillators", 1987 IEEE Transactions on Circuits and Systems, vol. CAS-34, No. 3, Mar. 1987, pp. 259-268.

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