Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1989-07-19
1992-06-23
Pascal, Robert J.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
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.
Nokia-Mobira Oy
Pascal Robert J.
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