Radio frequency level control circuit with reduced supply voltag

Details Radio frequency level control circuit with reduced supply voltag Radio frequency level control circuit with reduced supply voltag

1997-10-29

2000-11-07

Hunter, Daniel S.

Telecommunications

Transmitter and receiver at separate stations

With control signal

455 69, 4551921, 455338, H03G 330

Patent

active

061448427

ABSTRACT:
A radio frequency level control circuit is disclosed having a level controller, a sensor and a variable gain amplifier which are located in a feedback path of the level controller. The level controller forms an output signal by mixing an input signal and a feedback signal in a Gilbert cell. The sensor forms a measuring signal and a reference signal from the output signal. The variable gain amplifier produces a feedback signal from a difference between the measuring signal and the reference signal. The Gilbert cell has a current mirror circuit which is configured to lower the supply voltage of the Gilbert cell and to reflect current from the first stage to the second stage. The current mirror circuit is located between a first stage and a second stage of the Gilbert cell, where the first stage is coupled to the feedback signal and the second stage is coupled to the input signal.

REFERENCES:
patent: 5291150 (1994-03-01), Saarnimo et al.
patent: 5459426 (1995-10-01), Hori
patent: 5557228 (1996-09-01), Liu
patent: 5589791 (1996-12-01), Gilbert
patent: 5627486 (1997-05-01), Gross
patent: 5717360 (1998-02-01), Vu et al.
patent: 5815019 (1998-09-01), Uemura et al.
patent: 5826182 (1998-10-01), Gilbert
patent: 5841316 (1998-11-01), Shau

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