Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
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
054555434
ABSTRACT:
A low power consumption BPSK modulator uses only one center-tapped transformer and a single-pole double-throw (SPDT) switching arrangement including four field effect transistors and a pair of termination resistors. 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. An extremely important advantage of the subject invention in the field of handheld battery-powered communications equipment is that the subject apparatus can be made relatively small due to the necessity for only one transformer.
REFERENCES:
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patent: 4224583 (1980-09-01), Larkin
patent: 4276521 (1981-06-01), Davidheiser
patent: 4565980 (1986-01-01), Ashida
patent: 4940954 (1990-07-01), Aubert et al.
patent: 5039959 (1991-08-01), Young
patent: 5081432 (1992-01-01), Devlin et al.
patent: 5119396 (1992-06-01), Sanderford, Jr.
patent: 5311151 (1994-05-01), Vaisanen
RF Design magazine, Sep. 1993, p. 59, FP-BPM-1047.
Emanuel Peter M.
Kinkead Arnold
Lenihan Thomas F.
Pascal Robert J.
Thomson Consumer Electronics Inc.
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