Two-output low-noise down converter circuit

Details Two-output low-noise down converter circuit Two-output low-noise down converter circuit

1997-11-04

1999-12-28

Eisenzopf, Reinhard J.

Telecommunications

Wireless distribution system

455225, H04B 100

Patent

active

060093048

ABSTRACT:
The invention provides a two-output low-noise down converter circuit which is improved in the isolation between two outputs. In the two-output low-noise down converter circuit, an input signal is divided into two divisional signals of different polarization systems and then the divisional two signals are processed by two-system signal processing circuits which comprise low-noise amplifiers, band-pass filters, frequency converter circuits and a local oscillator, respectively. The two-output low-noise down converter circuit includes: a switching circuit for performing switching control on the outputs of the two signal processing circuits responsive to the voltages applied to two output terminals, and for selectively outputting two polarized signals to its output terminals; intermediate frequency amplifiers for amplifying the two outputs of the switching circuit and leading out the resulting outputs at the two output terminals; and a control circuit for controlling the turning-on and -off of the power of the intermediate frequency amplifiers responsive to loads of the two output terminals.

REFERENCES:
patent: 5027430 (1991-06-01), Yamauchi et al.
patent: 5345591 (1994-09-01), Tsurumaki et al.
patent: 5568158 (1996-10-01), Gould
patent: 5584064 (1996-12-01), Nakamura
patent: 5649311 (1997-07-01), Somei
patent: 5752180 (1998-05-01), Guo et al.

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