Control of VCO in ultrasonic flow meter

Details Control of VCO in ultrasonic flow meter Control of VCO in ultrasonic flow meter

1996-10-04

1998-03-17

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

7386127, 7386128, 331 65, G01F 166, H03L 700

Patent

active

057291802

ABSTRACT:
An apparatus for controlling a voltage controlled oscillator (20) in an ultrasonic flow meter (18) includes a comparator (28) for comparing a received signal to an estimate signal, to form an early-late signal (32). The early-late signal (32) is received by a counter (36) to form a count signal (38). A digital to analog converter (42) receives the count signal (38) and converts it to a control voltage output (40) that is coupled to the voltage controlled oscillator (20).

REFERENCES:
patent: 3824483 (1974-07-01), Margala et al.
patent: 4509372 (1985-04-01), Mount
patent: 4557148 (1985-12-01), Akiyama
patent: 5639971 (1997-06-01), Brown

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