Baseband phase-locked direct conversion receiver with frequency

Details Baseband phase-locked direct conversion receiver with frequency Baseband phase-locked direct conversion receiver with frequency

1997-02-10

1999-04-06

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455260, H04B 126

Patent

active

058930299

ABSTRACT:
To generate a fixed frequency offset in a direct conversion receiver (200) a phase ramp representing the frequency offset if generated. This phase ramp is combined with the demodulated phase component of a received signal. A phase wrap detection and compensation circuit (224) is capable of detecting and compensating for phase wrap that occur in the phase ramp by differentiating the input and detecting when a phase wrap is about to occur and causes a switch (316) to flip between two conditions. A first condition couples the phase ramp to the output. A second condition compensates when a wrap around has been detected. As such, a VCO (218) produces a local oscillator having a fixed frequency offset that is immune from locking problems that occur when a phase wrap is introduced.

REFERENCES:
patent: 4523324 (1985-06-01), Marshall
patent: 5003621 (1991-03-01), Gailus
patent: 5222253 (1993-06-01), Heck
patent: 5396521 (1995-03-01), Minami
patent: 5438692 (1995-08-01), Mohindra
patent: 5584068 (1996-12-01), Mohindra

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