Demodulation circuit having automatic frequency control function

Details Demodulation circuit having automatic frequency control function Demodulation circuit having automatic frequency control function

1991-11-26

1994-08-02

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551822, 455259, 455265, H04B 116

Patent

active

053353544

ABSTRACT:
A demodulation circuit having an automatic frequency control (AFC) function in which a received input high frequency signal is mixed with a first reference signal to once form an intermediate frequency signal, the intermediate frequency signal is then mixed with a second reference signal having an adjustable frequency through such a frequency correction unit as a matched filter unit to obtain a demodulation signal having a maximum power value kept as a base band signal. For the purpose of preventing the failure of maintaining the AFC function caused by the limited correctable range of the frequency correction unit such as the matched filter unit, when the correctable range of the frequency correction unit reaches its limit, the frequency of the first reference signal is separately adjusted to thereby keep the frequency of the intermediate frequency signal always within the correctable range of the frequency correction unit.

REFERENCES:
patent: 4112372 (1978-09-01), Holmes et al.
patent: 4237556 (1980-12-01), Naito
patent: 4658438 (1987-04-01), Kamata et al.
patent: 5109544 (1992-04-01), Mittel et al.
patent: 5132799 (1992-07-01), Gakumura

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