US 2006/0028270 A1 · Adaptable voltage control for a variable gain amplifier

Abstract

A method and apparatus for adaptively controlling a variable gain amplifier (VGA). The operation of the VGA is separated into a low gain mode and a high gain mode and the mode in which the VGA is currently operating in is adaptively sensed. A threshold voltage is compared to a control voltage of the VGA; if the VGA is currently operating in the low gain mode and the control voltage is higher than the threshold voltage, the VGA is switched from the low gain mode to the high gain mode; and if the VGA is currently operating in the high gain mode and the control voltage is lower than the threshold voltage, the VGA is switched from the high gain mode to the low gain mode.

Claims20

Dependent claims

A method for controlling gain of a variable gain amplifier (VGA) having a low gain mode and a high gain mode, the method comprising:

sensing which mode the VGA is operating in;
comparing a threshold voltage to a control voltage of the VGA;
if the VGA is operating in the low gain mode and the control voltage is higher than the threshold voltage, changing the VGA mode from the low gain mode to the high gain mode;
and
if the VGA is operating in the high gain mode and the control voltage is lower than the threshold voltage, changing the VGA mode from the high gain mode to the low gain mode.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/239,927Filed 29 Sep 2005

Priority

24 May 2004

Published

9 Feb 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

H03F 3/4569
Measuring at the common source circuit of the differential amplifier: controlling the common source circuit of the differential amplifier
H03F 3/45197
Using MOSFET transistors as the active amplifying circuit: pl types
H03F 3/45744
In differential amplifiers with FET transistors as the active amplifying circuit: by offset reduction
H03G 1/0088
Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal: using discontinuously variable…

Family

Application10/852,275Continuation · filed 24 May 2004

Application11/239,927Continuation · filed 29 Sep 2005

US 2005/0258900 A1Published application

US 6,980,053 B2Related patent

US 7,135,926 B2Related patent

US 2006/0028270 A1This patent

From the US filing history. Foreign family members aren’t listed.

Adaptable voltage control for a variable gain amplifier

Life of this patent

Adaptable voltage control for a variable gain amplifier

Life of this patent

Abstract

Claims20