Methods and circuitry for reducing intermodulation in...

Details Methods and circuitry for reducing intermodulation in... Methods and circuitry for reducing intermodulation in...

2006-05-23

2006-05-23

Chan, Wing (Department: 2643)

Telecommunications

Receiver or analog modulated signal frequency converter

Modulation distortion or cross talk correction or elimination

Reexamination Certificate

active

07050777

ABSTRACT:
Methods and circuitry reduce adverse impacts of intermodulation and optimize performance of integrated circuits that include two or more oscillator circuits on the same chip. In one embodiment, intermodulation between voltage-controlled oscillators (VCOs)in the receiver and transmitter paths of a transceiver is reduced by adjusting relative power of the VCOs and/or bandwidths of the phase-locked loops (PLLs). The invention measures the injection lock frequency range of the VCOs based on which transmitter and receiver VCO power and loop bandwidths are adjusted.

REFERENCES:
patent: 4763085 (1988-08-01), Lamberg
patent: 4864574 (1989-09-01), Pritt
patent: 6163684 (2000-12-01), Birleson
Heng-Chia Chang, ‘Analysis of Oscillators with External Feedback Loop for Improved Locking Range and noise Reduction’, Aug. 1999, IEEE Transactions on Microwave Theory and Techniques, vol. 47, No. 8, pp. 1535-1542.
European Search Report, May 21, 2003.

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