Distortion measurement system

Details Distortion measurement system Distortion measurement system

1974-09-25

1976-02-24

Mullins, James B.

Oscillators

Bridge type

R.c. or r.l. type

330 29, 330 59, 330 86, 330134, 331183, H03B 526

Patent

active

039407152

ABSTRACT:
A distortion measurement system for measuring distortion as low as 0.002% includes an ultra low distortion oscillator having a relatively fast response which is achieved by switching the time constant of the control loops of the oscillator during settling. The analyzer section included in the distortion system has a unique notch filter which provides low distortion. This is achieved by adding together two 90.degree. all pass phase shifters. In addition, automatic tuning is provided by two feedback control loops; one is responsive to out-of-phase signals which controls the RC filter circuits of the phase shifters and the other responds to the in-phase signals which controls the output summing junction of the notch filter. Finally, a feedforward type of simultaneous tuning is accomplished by ganging the oscillator frequency adjustment with the analyzer.

REFERENCES:
patent: 3868698 (1975-02-01), Dressler

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