Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1980-07-14
1982-10-19
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 23R, 332 48, 332 52, 375 42, H03C 500, H04L 2720
Patent
active
043552897
ABSTRACT:
A parallel type modulator is disclosed which utilizes a pair of bi-phase modulators (10), each of which are capable of independent phase and amplitude modulation. In each bi-phase modulator, a carrier frequency signal is split by a power splitter (20) into two signals 180.degree. apart in phase which are passed through directional couplers (30 and 31) and a pair of PIN diodes (35 and 36) to a summing junction (37). A bias source circuit (42) delivers biasing current to the coupled outputs of the directional couplers (30, 31) and through the PIN diodes (35, 36) to the summing junction (37); this current is returned to ground through a bias return circuit (44) which conducts the DC or low frequency biasing signal but allows the carrier frequency output signal to be passed through to the output of each bi-phase modulator. Reduction of the bias current to one diode below null levels at which the intermediate signals cancel will cause a carrier frequency signal to appear at the summing junction which will be in phase with the signal passed through the other diode. A continuous variation of the bias current through one of the diodes at a level below the null current level will result in amplitude modulation of the output signal at the summing junction. The PIN diodes are always operated in their conducting regions so that large parasitic reactances at microwave frequencies are avoided. A parallel modulator can be formed of a pair of the bi-phase modulators provided with carrier frequency signals in quadrature, and with the outputs of each bi-phase modulator being summed to yield an output signal at the carrier frequency which can have an arbitrary phase angle and continuous modulation of amplitude.
REFERENCES:
patent: 3624559 (1971-11-01), Schaeperkoetter
patent: 3701053 (1972-10-01), de Rubinat
patent: 3798573 (1974-03-01), Seidel
patent: 3996532 (1976-12-01), Fletcher et al.
patent: 4021758 (1977-05-01), Standing
patent: 4028641 (1977-06-01), Bodtmann et al.
patent: 4090147 (1978-05-01), Seidel
patent: 4276521 (1981-06-01), Davidheiser
Beyer James B.
Summers James B.
Grimm Siegfried H.
Westin Edward P.
Wisconsin Alumni Research Foundation
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