Rectification feedback high frequency circuit arrangement includ

Details Rectification feedback high frequency circuit arrangement includ Rectification feedback high frequency circuit arrangement includ

1993-03-01

1995-12-12

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455127, 375345, H01Q 1112, H04B 104

Patent

active

054758734

ABSTRACT:
To prevent variation of a transmission band characteristic which is caused by variation of operational conditions (e.g., temperature in the rectification feedback amplification) in a system with large extraband attenuation for sharply cutting off the transmission band in each channel of the communication system including plural narrow band channels allotted close to each other, rectification feedback is effected through through an adaptive filter. A band characteristic of the adaptive filter is varied in response to the variation of operational conditions including temperature, while data processing is rapidly effected through digital signal processing. Consequently, even if the communications in each channels are intermittently repeated, each time the communication is reopened, the desired transmission band characteristic can be instantly fixed, so as to prevent the disturbance of stable operation by adjudicating the interference through data correlation.

REFERENCES:
patent: 4553105 (1985-11-01), Sasaki
patent: 4910799 (1990-03-01), Takayama
patent: 4996500 (1991-02-01), Larson et al.
patent: 5128629 (1992-07-01), Trinh
patent: 5179353 (1993-01-01), Miyake
patent: 5196806 (1993-03-01), Ichihara
patent: 5337006 (1994-08-01), Miyazaki

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