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학술대회 Modified-Nauta Operational Transconductance Amplifier for 400 MHz High-Q VHF Filter
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박정우, 김천수, 유현규
Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF) 2009, pp.132-135
This paper proposes an efficient transconductor structure nearly free from the serious drawback of commonmode signal amplification at its output found in the conventional Nauta-OTA widely used for the implementation of VHF filter. A newly developed method mathematically clarifies the transfer characteristic of the proposed OTA and reveals the essential features of OTA/gyrator. In order to verify this scheme, we implemented a transconductor circuit and a lowpass filter based on the proposed concepts, using a compact circuit design that avoids CMFB circuit and parasitic poles. The measurement results of a 7th order Gm-C Chebyshev lowpass filter with cutoff frequency of 400MHz, are shown. ©2009 IEEE.
KSP 제안 키워드
Compact circuit, Cut-off frequency, Gm-C, High Q, Low Pass Filter, Operational transconductance amplifier, circuit design, measurement results, signal amplification, transfer characteristics