Combined analog/digital frequency modulator

Modulators – Phase shift keying modulator or quadrature amplitude modulator

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Details

332119, H03C 100

Patent

active

051246724

ABSTRACT:
A circuit arrangement allows either analog (ANAL) modulation or (DIG) digital modulation to be selected by means of couplers (K1, K2) for transmission over a radio channel. The analog or digital signals are applied to I,Q generators to form I, Q wave shapes (I.sub.A, Q.sub.A or I.sub.D, Q.sub.D), which modulate a possible intermediate frequency in a stage (3) and upon summation, modulate a transmission frequency in a stage (4).

REFERENCES:
patent: 4682123 (1987-07-01), Loper et al.

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