Modulator having oscillator for generating IF and RF signals by

Details Modulator having oscillator for generating IF and RF signals by Modulator having oscillator for generating IF and RF signals by

1993-07-06

1994-12-13

Grimm, Siegfried H.

Modulators

Amplitude modulator

Plural modulation

332167, 332170, 455 46, 455 47, 455102, 455109, H03C 152, H03C 160

Patent

active

053732650

ABSTRACT:
Apparatus and method for effecting single sideband suppressed carrier modulation suitable for small, hand-held, high-frequency cellular radio transmitters such as those used at 900 mHz. A local oscillator generates a signal at 0.8 the frequency of the desired carrier. The generated frequency is counted down to produce an IF that is 0.2 the frequency of the desired carrier and the IF is mixed with the baseband signal to produce a modulated IF. The modulated IF is then mixed with the first generated signal to generate the modulated carrier signal. Advantageously, all of the foregoing components can be provided on the same integrated circuit chip.

REFERENCES:
patent: 4025855 (1977-05-01), Atkinson
patent: 4540958 (1985-09-01), Neyens et al.
patent: 5243304 (1993-09-01), Rixon

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