Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
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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Kim Cheon Soo
Park Sung Kyung
Electronics and Telecommunications Research Institute
Ladas & Parry LLP
Nguyen Patricia
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