Automatic timebase calibration for synchronizing a timebase freq

Details Automatic timebase calibration for synchronizing a timebase freq Automatic timebase calibration for synchronizing a timebase freq

1998-06-10

2000-12-05

Brown, Glenn W.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Calibration

324 7653, 324 7671, 324 7679, 331 14, 331 18, G01R 3500, H03L 706

Patent

active

061571989

ABSTRACT:
The present invention is a timebase calibration system having a phase locked loop configuration. The system includes a phase detector having a first input receiving an output of an oscillator, and a second input which can be coupled to a frequency reference. The output of the phase detector is provided through a switch to a first input of a summer, while a second input of the summer is connected to a digital to analog (D/A) converter. The output of the summer is provided to a voltage control input of the timebase oscillator. The system further includes a digital voltmeter with an input connected to the output of the phase detector. With such a system, the output of the digital voltmeter provides a voltage proportional to the frequency error between the timebase oscillator and the frequency reference standard. By adjusting the digital input to the D/A converter to generate an analog output voltage which drives the output of the voltmeter to zero volts, the frequency of the timebase oscillator is calibrated to match the frequency reference.

REFERENCES:
patent: 4580107 (1986-04-01), Caldwell et al.
patent: 5048335 (1991-09-01), Marsh et al.
patent: 5079522 (1992-01-01), Owen et al.
patent: 5382922 (1995-01-01), Gersbach et al.
patent: 5450458 (1995-09-01), Price et al.
patent: 5689808 (1997-11-01), Sandahl et al.

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