Active-MOSFET-C single-amplifier biquadratic filters for video frequencies

H. R. Schmid, G. S. Moschytz

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


The authors show how continuous-time active-RC filters can be implemented in CMOS by replacing all resistors by MOSFETs operating in the linear region. As an example, a 24 MHz active-MOSFET-C single-amplifier biquadratic lowpass filter with a pole-Q of 3 implemented in a 0.6 μm CMOS process is discussed. By comparing measurements of a test chip, simulations and calculations, the following conclusion is reached: as long as the specifications for frequency, pole-Q, spurious-free dynamic range and supply voltage lie within certain limits, then active-MOSFET-C single-amplifier biquads (MOSFET-C SABs) are preferable, with respect to chip size and power consumption, compared to multi-amplifier biquads, e.g. integrator-connected biquads. Above these limits, the latter must be used.

Original languageEnglish
Pages (from-to)35-41
Number of pages7
JournalIEE Proceedings: Circuits, Devices and Systems
Issue number1
StatePublished - 2000
Externally publishedYes


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