Precision rectifier circuits

Details Precision rectifier circuits Precision rectifier circuits

1980-01-08

1981-12-22

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307491, 307499, 328 6, 363 45, H03K 501, G06G 712

Patent

active

043073050

ABSTRACT:
A precision rectifier circuit includes two differential amplifiers each having a negative feedback path including a diode. Two pnp transistors have their base-emitter paths connected in parallel with the respective diodes and their collectors connected together and via an output resistor to ground. An a.c. signal to be rectified is applied to non-inverting inputs of the amplifiers, whose inverting inputs are interconnected via a resistor in series with a capacitor, to develop a unipolar output voltage across the output resistor. The capacitor renders the output voltage independent of input offset voltages of the amplifiers. The transistors can comprise Darlington-connected transistors to avoid the need for matching.

REFERENCES:
patent: 3553566 (1971-01-01), Nagy, Jr.
Electronic Design Notes (EDN), Measure Differential A.C. Signal Easily with Precision Rectifiers, by J. Graeme, Jan. 20, 1975, pp. 45-47.
Electronic Design Notes (EDN), Full Wave Rectifier Needs Only Two Resistors, by S. Smith, Jan. 5, 1975, p. 56.

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