Amplifiers – Sum and difference amplifiers
Reexamination Certificate
2007-11-20
2009-11-10
Choe, Henry K (Department: 2817)
Amplifiers
Sum and difference amplifiers
C330S253000
Reexamination Certificate
active
07616056
ABSTRACT:
Provided is an operational transconductance amplifier (OTA). An existing Nauta transconductor used to implement a high frequency Gm-C filter integrated circuit (IC) is analyzed by a new method and from a new perspective to remove extra components and divide roles of remaining inverters for more simple and efficient circuit structure. In an existing Nauta transconductor, a common mode signal from an input terminal is amplified and appears at an output terminal, while in the inventive Nauta transconductor the common mode signal from an input terminal does not appear at the output terminal and is effectively eliminated. These enhanced characteristics can be achieved with a smaller number of inverters than an existing Nauta transconductor. Frequency characteristics of the filter can be effectively enhanced by independently controlling the quality factor without affecting the transconductance value required for frequency characteristics of the filter.
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Kim Cheon Soo
Park Jung Woo
Choe Henry K
Electronics and Telecommunications Research Institute
Rabin & Berdo P.C.
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