Circuit to reduce harmonic distortion in a triangular wave-form

Details Circuit to reduce harmonic distortion in a triangular wave-form Circuit to reduce harmonic distortion in a triangular wave-form

1974-09-30

1976-01-13

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

235183, 307228, 328181, G06G 726, H03K 408

Patent

active

039327418

ABSTRACT:
A device is disclosed for generating a triangular wave form for use in an electronic function generator. The device employs a level detector which produces a square wave output to drive a triangular function generator in a loop arrangement.
Amplitude symmetry of the triangular wave is maintained by sensing the average value and comparing it with a reference level to generate an error signal which in turn serves as a reference input to the level detector. The output of the level detector is therefore corrected to cancel drifts in the average or base line value of the triangular wave form.
Time symmetry, or symmetry of the positive and negative slopes of the triangle is maintained by means of a feedback loop utilizing a stable current source. The time symmetry of the square wave is the same as that of the triangle. The square wave is sensed and serves to switch on and off the stable current source. By integrating the current from the current source a voltage is obtained which is proportional to time asymmetries in the square wave. An error signal derived from the integrated current is used in the triangle generator to control either the positive or negative slope of the wave form. A triangular wave form is therefore generated which has both stable amplitude symmetry and time symmetry.

REFERENCES:
patent: 3577007 (1971-05-01), Cross
patent: 3610952 (1971-10-01), Chandos
patent: 3676698 (1972-07-01), Hunter
patent: 3713000 (1973-01-01), Driskell et al.
patent: 3743951 (1973-07-01), Carroll

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