Frequency stabilization circuit using signal level threshold

Details Frequency stabilization circuit using signal level threshold Frequency stabilization circuit using signal level threshold

1997-11-06

2000-02-22

Trost, William G.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455 75, 455255, 331 1R, H04B 106

Patent

active

060290552

ABSTRACT:
A frequency stabilization circuit includes a local oscillator, a mixer, a level comparator, a frequency comparator, and a controller. The local oscillator outputs a local oscillation signal in accordance with a control voltage. The mixer converts a received radio frequency signal into an intermediate frequency signal using the local oscillation signal from the local oscillator. The level comparator compares a DC voltage corresponding to the intermediate frequency signal from the mixer with a reference voltage to determine whether the reception electric field level of the radio frequency signal is high or low. The frequency comparator compares the frequency of the intermediate frequency signal from the mixer with the frequency of the reference signal to output frequency difference information. The frequency comparator outputs previous frequency difference information when the comparison result of the level comparator indicates a decrease in reception electric field level. The controller outputs the control voltage to the local oscillator in accordance with the frequency difference information from the frequency comparator.

REFERENCES:
patent: 4856080 (1989-08-01), Hulkko
patent: 5107220 (1992-04-01), Andoh
patent: 5280641 (1994-01-01), Ishii et al.
patent: 5335364 (1994-08-01), Heinonen
patent: 5574998 (1996-11-01), Andoh
patent: 5621757 (1997-04-01), Hori

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