Balanced modulator using logic gates for DSBSC output

Details Balanced modulator using logic gates for DSBSC output Balanced modulator using logic gates for DSBSC output

1982-09-20

1984-12-25

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 43B, 332 44, 332 48, 332 51R, 375 43, 375 61, 455 46, 455109, H03C 154

Patent

active

044906897

ABSTRACT:
A balanced modulator, producing a double sideband suppressed carrier (DSBSC) output achieves carrier suppression and linear performance suitable to modulate frequency division multiplexed signals with stringent interchannel interference requirements. It is simply and inexpensively realized through the use of two logic gates which are arranged in a dual complementary fashion, so that their output terminals go high and low alternately, and which drive a center-tapped transformer through coupling capacitors to provide the required switching function necessary to produce the DSBSC output. The modulator circuit has the added feature that the square wave carrier source that is applied to the logic gates can be the means of activating the circuit, thereby eliminating the need for a separate power supply.

REFERENCES:
patent: 3401359 (1968-09-01), Becker
patent: 3636478 (1972-01-01), Glock
patent: 4142162 (1979-02-01), Huntley
patent: 4346354 (1982-08-01), Hanna

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