Arrangement for Carrier Recovery from Two Received Phase Shift K

Details Arrangement for Carrier Recovery from Two Received Phase Shift K Arrangement for Carrier Recovery from Two Received Phase Shift K

1985-09-27

1987-06-23

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

329112, 375 97, H03D 322

Patent

active

046758836

ABSTRACT:
An arrangement for carrier recovery of two pulse shift keyed signals comprising a bandpass filter at the input which is followed by a series connection of a full-wave rectifier, a carrier frequency filter and a frequency divider is particularly characterized in that the input signal is converted into a push-pull signal in a transformer and employed for driving an emitter-coupled amplifier, two pairs of emitter-coupled transistors being connected in series between the input and a pair of operational amplifiers. A first of the operational amplifiers is connected to a voltage controlled oscillator. Its output is connected to a first frequency divider, the first frequency divider being connected to a further frequency divider for a further division of two for connection to a demodulator which receives the input signal. The second operational amplifier generates a control signal which is fed, by way of a filter section, to a field effect transistor as a part of a variable resistor connected in the input circuit for controlling the output voltages of the second pair of emitter-coupled transistors which feed the two operational amplifiers.

REFERENCES:
patent: 2167480 (1939-07-01), Hansell
patent: 3339143 (1967-08-01), Chaffee
patent: 3349330 (1967-10-01), Wedmore
patent: 3708751 (1973-01-01), Starr et al.
patent: 3753114 (1973-08-01), Burley
patent: 4201948 (1980-05-01), Natens
patent: 4233565 (1980-11-01), Chmura
patent: 4298986 (1981-11-01), Hughes
patent: 4475218 (1984-10-01), Takeda et al.
Seymour, R., "A Monolithic RF/IF Amplifier and Its Applications", Wescon Technical Papers, vol. 11, No. 2, 1967, Aug. 8-25, pp. 1-10.

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