Modulator using low-pass filter as delay element

Details Modulator using low-pass filter as delay element Modulator using low-pass filter as delay element

1991-09-06

1993-05-25

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

Including discrete semiconductor device

332152, 332164, 332168, 332172, 332177, 375 39, 375 43, 375 61, 455 46, 455109, 455327, 455330, 455332, H03C 114, H03C 158, H04L 2720

Patent

active

052143970

ABSTRACT:
A push-pull modulator stage 70 has two possible transmission paths, an electrically short path (7) and a phase delay path (6) with a phase delay element providing a phase shift of approximately 180.degree.. The phase delay element has the form of a low pass filter. In each of the two paths (6, 7) a semiconductor diode (D.sub.1, D.sub.2) is disposed in such a way that they sense the carrier (U.sub.c) with a phase shift of 180.degree. and, correspondingly, switch in unison if no modulation voltage (U.sub.m) is present, thus suppressing the carrier at the signal output (3). When a modulation signal (U.sub.m) is present, the push-pull balance is disturbed and the resistance of one of the two paths (6) becomes lower relative to the other path (7), which leads to the generation of the modulated carrier voltage (Umc). The modulator stage (70) can also be designed as a dual modulator stage and/or can be used as a mixer stage.

REFERENCES:
patent: 4249263 (1981-02-01), Shinkawa et al.
patent: 4528526 (1985-07-01), McBiles
patent: 4607394 (1986-08-01), Nightingale
patent: 4612518 (1986-09-01), Gans et al.

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