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Title:
On the use of Nauta's transconductor in low-frequency CMOS g(m)-C bandpass filters
IEEE Journal of Solid-State Circuits
Type:
article
Keywords:
polyphase, filters, non-quasi-static phenomena, non-quasi-static MOS models, g(m)-C filters, complex filters, bandpass filters, CMOS
Abstract:
This paper discusses the use of a transconductor, first proposed by Nauta for high frequency applications, in low frequency CMOS g(m) - C bandpass filters. The behavior of the transconductor is examined in detail, showing that the robust implementation of higher-order low-voltage filters is possible for center frequencies in the lower megahertz region. The experimental results are presented of the realization of two prototypes, a 0.6-mum CMOS 18th-order real bandpass filter and a 0.35-mum CMOS 7th-order complex (14th-order bandpass) filter, both with a center frequency of 3 MHz and a passband of 1 MHz. These filters comply with the specifications for the channel-select stage of the Bluetooth short-range radio receiver.
Year:
2002
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