High-frequency step attenuator suitable for transmission circuit

Details High-frequency step attenuator suitable for transmission circuit High-frequency step attenuator suitable for transmission circuit

1996-06-07

1998-09-08

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455115, H01Q 1112, H04B 104

Patent

active

058059865

ABSTRACT:
A high-frequency signal step attenuator including an amplifying circuit having a transistor element with its base or gate connected to an input terminal to which a high-frequency input signal is supplied, and supplying an amplified output signal of the input signal to an output terminal, a current detector for detecting a current flowing through a current path of collector-emitter or a current path of drain-source of the transistor element to generate an output voltage corresponding to a detected current, a voltage setter for selectively generating output voltages of different levels, and a comparator for comparing the output voltage of the current detector with the output voltage of the voltage setter, and supplying an output signal of a compared result as a feedback signal to the base or gate of the transistor element.

REFERENCES:
patent: 5113525 (1992-05-01), Andoh
patent: 5337006 (1994-08-01), Miyazaki
patent: 5376895 (1994-12-01), Aihara
patent: 5566363 (1996-10-01), Senda

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