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A CMOS lowpass filter with programmable cutoff frequency is presented. The architecture is gm/C type with the gm controlled through a resistor servo approach. The wide tuning range is achieved by exploiting a dual loop control over a degenerated differential pair. This filter, implemented in a 0.25 µm 2.5V CMOS technology, dissipates 120mW with fc=120MHz and has a die area of 0.23mm2.
Line fed telecommunication circuits like battery operated circuits must work from very low supplies. Contrary to most battery operated systems in telecommunication applications, high performance is also required. This paper describes two low voltage (1.5 V minimum) Switched Capacitor (S.C.) filters that achieve a dynamic range comparable with that of filters operated from 5V or more. Both filters...
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