Transmitter with complex phase comparator

Details Transmitter with complex phase comparator Transmitter with complex phase comparator

1998-12-08

2000-10-17

Kinkead, Arnold

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

332103, 332100, 455260, 375302, 375306, H03C 300, H04B 100

Patent

active

061338044

ABSTRACT:
A transmitter in which a complex low IF digitised signal is applied in quadrature to a complex phase comparator together with a digitised frequency down-converted version of an analogue signal produced by a transmitter VCO. The low IF digitised signal serves as a reference against which the digitised frequency down-converted version of the transmitter VCO is compared. The output of the complex phase comparator is converted to an analogue signal which is applied as a control signal to the transmitter VCO. An analogue embodiment of the transmitter which uses zero-IF signals is also disclosed.

REFERENCES:
patent: 5960364 (1996-11-01), Dent

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