Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1974-09-04
1976-02-24
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
329 50, 329101, 329146, 329150, 329163, 329167, 332 31T, 332 41, 332 44, 332 45, H03C 154, H03D 124
Patent
active
039407160
ABSTRACT:
A double-balanced modulating and demodulating circuit is disclosed for producing from carrier and modulating input signals at least one double sideband suppressed carrier signal. A pair of dual-channel amplitude modulators are provided each of which is operable to produce a pair of full-wave unsuppressed-carrier amplitude-modulated output signals without filtering. The modulating signal is applied to each amplitude modulator in phase opposition, respectively, so as to produce envelopes of the output signals that are in phase opposition. The various outputs of the amplitude modulators are combined in summing circuits so as to produce without filtering two double sideband signals in phase opposition, respectively, and two reconstituted unmodulated carrier signals which are in phase opposition, respectively. By the use of feedback means, the device will operate as its own local oscillator.
REFERENCES:
patent: 3243731 (1966-03-01), Erickson
patent: 3252094 (1966-05-01), Hughes et al.
patent: 3514720 (1970-05-01), Roucache et al.
patent: 3810047 (1974-05-01), Gehring
Grimm Siegfried H.
Laubscher Lawrence E.
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