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Full-Wave Tunnel Diode Rectifier-Demodulator

IP.com Disclosure Number: IPCOM000096995D
Original Publication Date: 1962-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Simaitis, GE: AUTHOR [+2]

Abstract

The circuit performs full wave rectification demodulation of small RF voltages by using a portion of the D.C. characteristic of a tunnel diode.

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Full-Wave Tunnel Diode Rectifier-Demodulator

The circuit performs full wave rectification demodulation of small RF voltages by using a portion of the D.C. characteristic of a tunnel diode.

The circuit is such that R1 and R2, in combination with +V, biases tunnel diode E at a peak current value P on its D.C. characteristic. A resistor R3 is connected in series with E and in parallel with R2, while a capacitor C is connected in parallel with R3. With the circuit operating point established at P, corresponding to voltage VP, a modulated carrier signal Ein is applied to terminal 10 of the circuit. The level of Ein causes operation of E to points S and Q, corresponding to voltages VS and VQ, respectively.

Upon application of the modulated input carrier signal Ein to terminal 10, E alternately swings from point S to point Q, causing a decrease in current through E on each variation from point P. Thus the average D.C. through E decreases by an amount proportional to the level of the A.C. voltage applied. Resistor R3 serves as a load where the unidirectional current change is realized as an output voltage obtained by application of Ein. The R3, C combination serves to filter out the carrier frequency of Ein. The signal level of Ein is held to operate only within the symmetrical portion of the D.C. characteristic of E, on either side of point P, points S and Q, to insure minimum distortion and maximum demodulating efficiency.

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