Automatic frequency control circuit applicable to a mobile commu

Details Automatic frequency control circuit applicable to a mobile commu Automatic frequency control circuit applicable to a mobile commu

1996-04-05

1998-03-10

Ghebretinsae, T.

Pulse or digital communications

Receivers

Automatic frequency control

375336, 4551822, 331 1A, H04L 2706

Patent

active

057270309

ABSTRACT:
An automatic frequency control circuit comprises an quadrature demodulation unit for creating an in-phase signal and an antiphase signal by quadrature-demodulating a Gaussian Minimum Shiftkeying signal and supplying an electric field strength signal exhibiting an electric field strength of the Gaussian Minimum Shiftkeying signal as well as the created in-phase and antiphase signals; a quality judging unit for judging the quality of the Gaussian Minimum Shiftkeying signal and creating an automatic frequency-controlling data indicating a compensation amount in accordance with the obtained quality signal; a converter for converting into digital signals the in-phase signal, antiphase signal and electric field strength signal supplied from the quadrature demodulation unit and converting the automatic frequency-controlling data into an analog signal; a temperature compensated crystal oscillation circuit for compensating the frequency of the GMSK signal on the basis of the compensation amount indicated by the automatic frequency-controlling data converted into an analog signal by the converter.

REFERENCES:
patent: 5495506 (1996-02-01), Shoji
patent: 5557643 (1996-09-01), Kim et al.
patent: 5633898 (1997-05-01), Kishigami et al.
patent: 5634205 (1997-05-01), Kurisu et al.

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