Detector for automatic gain control

Details Detector for automatic gain control Detector for automatic gain control

2007-02-21

2008-12-16

Nguyen, Patricia (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S254000, C330S085000

Reexamination Certificate

active

07466196

ABSTRACT:
Provided is a detector for automatic gain control (AGC). The detector for AGC is used for a variable gain amplifier (VGA) including at least one VGA cell. The detector for AGC includes: first and second transistors having drains connected in common to a power supply voltage and sources connected in common to a first node, and driven in response to a non-inverting output voltage and an inverting output voltage of the VGA cell, respectively; a first current source connected between the sources of the first and second transistors and a ground voltage to supply a predetermined current; a third transistor having a drain and a source connected to the power supply voltage and a second node, respectively, and driven in response to a pre-set reference voltage; a second current source connected to the source of the third transistor and the ground voltage to supply a predetermined current; and a comparator having a non-inverting input terminal and an inverting input terminal connected to the first and second nodes, respectively, and comparing a peak voltage from the first node with a reference voltage from the second node to output a control voltage with a predetermined level to the VGA cell based on the comparison result. The detector for AGC can continuously and effectively detect an output swing of the VGA.

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