Novel allpass filter configuration employing single OTRA

A new circuit configuration uses a single operational transresistance amplifier (OTRA) and four passive elements to realize both first- and second-order allpass filters. Owing to internal grounding of the OTRA input terminals, effects of input parasitics are significantly reduced. Applications of th...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 2, Analog and digital signal processing Analog and digital signal processing, 2005-03, Vol.52 (3), p.122-125
Main Authors: Cakir, C., Cam, U., Cicekoglu, O.
Format: Article
Language:English
Subjects:
Allpass filters
Amplifiers
Analog integrated circuits
Band pass filters
Capacitors
Circuits
CMOS
Equalizers
Frequency
Operational amplifiers
operational transresistance amplifiers (OTRAs)
Oscillators
Quadratures
Resistors
Signal processing
Simulation
Terminals
Transfer functions
Voltage
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Description
Summary:A new circuit configuration uses a single operational transresistance amplifier (OTRA) and four passive elements to realize both first- and second-order allpass filters. Owing to internal grounding of the OTRA input terminals, effects of input parasitics are significantly reduced. Applications of the circuit include the realization of the phase equalizer, the quadrature oscillator, and the high-Q bandpass filter for analog signal processing. The performance of the allpass filter is illustrated by circuit-level simulation of a quadrature oscillator with CMOS realization of the OTRA.
ISSN:1549-7747
1057-7130
1558-3791
DOI:10.1109/TCSII.2004.842055