Control of a variable gain amplifier with a delta sigma modulato

Details Control of a variable gain amplifier with a delta sigma modulato Control of a variable gain amplifier with a delta sigma modulato

1998-06-05

2000-05-09

Lee, Benny

Amplifiers

With semiconductor amplifying device

Including gain control means

330129, H03G 310

Patent

active

060609508

ABSTRACT:
Apparatus, and an associated method, for generating a gain control signal for controlling operation of a variable gain amplifier. Gain control circuitry includes a delta sigma modulator which exhibits a noise transfer function for shifting noise components of a gain control signal formed therefrom upwards in frequency. Undesired modulation of portions of a received signal to be amplified by the amplifier, together with noise components of the gain control signal, thereby do not interfere with operation of apparatus in which the variable gain amplifier forms a portion.

REFERENCES:
patent: 5083304 (1992-01-01), Cahill
patent: 5283536 (1994-02-01), Wheatley, III et al.
patent: 5722062 (1998-02-01), Nakanishi et al.
patent: 5737033 (1998-04-01), Masuda

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