Heterodyne receiver with synchronous demodulation for receiving

Details Heterodyne receiver with synchronous demodulation for receiving Heterodyne receiver with synchronous demodulation for receiving

1996-06-10

1999-07-27

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455313, 455323, 455260, 375294, 375376, H04M 546

Patent

active

059306971

ABSTRACT:
A heterodyne receiver operating on the principle of synchronous modulation for time-signal reception where a first mixer is driven by the first phase-locking loop which is fed from a reference frequency source and a switchable precharging value. By means of switched frequency dividers and the precharging values, internationally different clock frequencies (JP: 40 kHz; USA/GB: 60 kHz; EU/D: 77.5 kHz) can be processed and converted to the intermediate frequencies. These are then synchronously demodulated by means of a second mixer which receives its signal from the second phase-locking loop that is driven through the intermediate frequency signal via the phase comparator, and also through the control signal of the phase-locking loop, so that only residual error adjustment need be performed.

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