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Conference Paper
Modified-Nauta Operational Transconductance Amplifier for 400 MHz High-Q VHF Filter
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- Authors
- Jung Woo Park, C.S.Kim, H.K. Yu
- Issue Date
- 2009-01
- Citation
- Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF) 2009, pp.132-135
- Language
- English
- Type
- Conference Paper
- Abstract
- 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 Keywords
- Compact circuit, Gm-C, High Q, Low Pass Filter, Operational transconductance amplifier, circuit design, cutoff frequency, measurement results, signal amplification, transfer characteristics