Multiple RF carrier synthesizer

Details Multiple RF carrier synthesizer Multiple RF carrier synthesizer

1994-01-28

1995-11-28

Chin, Stephen

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

331 16, 331 23, 331 34, H04B 106, H04B 700, H03L 700

Patent

active

054716730

ABSTRACT:
Circuitry for simultaneously generating a set of carriers having preselected frequencies in the amplitude modulation broadcast band includes a circuit for producing a train of pulses having a crystal-controlled pulse repetition frequency equal to the separation in frequency between successive assignable frequencies in the broadcast band, each pulse in the train having a pulsewidth approximately equal to the reciprocal of the frequency of the lower end of the broadcast band and having a rise time approximately equal to the reciprocal of the frequency of the upper end of the broadcast band, so that the spectrum of the train of pulses includes components having frequencies equal to all of the assignable frequencies in the broadcast band, the pulse train being applied to a set of phase-locked oscillators connected in parallel, each oscillator being tuned to a different one of the selected components of the train of pulses.

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