Binary phase shift key modulator with programmable level control

Details Binary phase shift key modulator with programmable level control Binary phase shift key modulator with programmable level control

1990-04-02

1991-09-03

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

Including discrete semiconductor device

375 52, 375 67, H04L 2720

Patent

active

050458167

ABSTRACT:
A BPSK modulator for modulating a data signal onto a carrier signal comprises first and second transistors connected in a mirror configuration and a center tap transformer. The collectors of the first and second transistors are coupled to a first winding of the center tap transformer and the BPSK modulated carrier signal is provided at the output of the transformer. Unmodulated data is input to each of the bases of the first and second transistors. The emitters of the first and second transistors are coupled to the collector of a third transistor whose base receives the carrier signal. A programmable gain control circuit is also coupled to the base of the third transistor for step-wise adjustment of the transmit level of the BPSK modulated carrier signal. In this manner, the transmit output level of the modulator may be adjusted when necessary in the event of changing environmental or other considerations.

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patent: 4885794 (1989-12-01), Sprignoli
Callais & Durfee, Official Transcript, 20th Annual NCTA Convention, Jul. 6-9, 1971, pp. 28-48--Washington, DC, "The Subscriber Response System".

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