Method for lowpass filter calibration in a satellite receiver

Details Method for lowpass filter calibration in a satellite receiver Method for lowpass filter calibration in a satellite receiver

1997-06-18

2000-10-17

Vo, Don N.

Pulse or digital communications

Receivers

Interference or noise reduction

455266, H04B 110

Patent

active

061342823

ABSTRACT:
An improved satellite receiver front end architecture having a tuner chip and a demodulator/decoder chip. The tuner chip includes a lowpass filter having a configurable cutoff frequency, and the tuner chip uses a frequency signal to provide accurate adjustment of the cutoff frequency. A clock signal having a clock frequency is converted into a control voltage which determines the cutoff frequency of the lowpass filter. Consequently, the cutoff frequency may be increased by increasing the clock frequency, or decreased by decreasing the clock frequency. This configuration provides for improved cutoff frequency control in the presence of signal interference.

REFERENCES:
patent: 5511235 (1996-04-01), Duong et al.
patent: 5933769 (1999-08-01), Kaneko

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