Gain controlled amplifier and cascoded gain controlled...

Details Gain controlled amplifier and cascoded gain controlled... Gain controlled amplifier and cascoded gain controlled...

2006-02-07

2008-08-26

Mottola, Steven J (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S282000

Reexamination Certificate

active

07417499

ABSTRACT:
A gain controlled amplifier and a cascoded gain controlled amplifier based on the same are disclosed. The gain controlled amplifier includes an operational amplifier for amplifying an input signal, an input resistor connected to an input terminal of the operational amplifier, a feedback resistor connected to an output terminal of the operational amplifier, and a resistor circuit for providing voltages having different levels to the input terminal and the output terminal of the operational amplifier, respectively, according to a digital signal composed of specified bits. The gain controlled amplifier employs an R-2R ladder circuit controlled by a digital signal so as to obtain a gain that is in linear proportion to a decibel scale. Since the R-2R ladder circuit operates with a small resistance value, the chip size of the gain controlled amplifier can be reduced.

REFERENCES:
patent: 5034699 (1991-07-01), Powell
patent: 2007/0090875 (2007-04-01), McLachlan et al.
patent: 07-176964 (1995-07-01), None
patent: 2003-087068 (2003-03-01), None
Korean Office Action issued Jul. 31, 2006 for Korean Patent Application No. 2005-13262.

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