Low power consumption binary phase-shift-keyed (BPSK) modulator

Details Low power consumption binary phase-shift-keyed (BPSK) modulator Low power consumption binary phase-shift-keyed (BPSK) modulator

1994-01-28

1995-10-03

Pascal, Robert J.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332105, 332104, 375200, 375308, 375279, H04K 100, H03C 300

Patent

active

054555442

ABSTRACT:
A low power consumption BPSK modulator uses only a single input transformer which is not required to be center-tapped, and a switching arrangement including four junction field effect transistors. An advantage of the subject invention is that the DC switching current is reduced by a factor of approximately 1500 with respect to a conventional diode ring modulator. The carrier signal loss of the subject apparatus is lower than that exhibited by a ring modulator due to the use of only a single transformer, and due to the low on-resistance of the JFETs. An extremely important advantage of the subject invention in the field of cordless telephone handsets is that the subject apparatus can be made relatively small due to the necessity for only one transformer.

REFERENCES:
patent: 4224583 (1980-09-01), Larkin
patent: 4276521 (1981-06-01), Davidheiser
patent: 4940954 (1990-07-01), Aubert et al.
patent: 5119396 (1992-06-01), Sanderford, Jr.
RF Design magazine, Sep. 1993, p. 59, FP-BPM-1047.

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