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High-frequency voltage-controlled continuous-time lowpass filter using linearised CMOS integrators

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2 Author(s)
Nedungadi, A.P. ; Texas A&M University, Department of Electrical Engineering, College Station, USA ; Geiger, R.L.

The design and implementation of a continuous-time lowpass filter with voltage-controlled cutoff frequency and passband ripple is presented. The circuit uses a linearised CMOS transconductor as a basic integrating building block. A voltage-controlled phase-adjusting scheme is employed in the integrator to compensate for excess phase in the transconductance at high frequencies. The fabricated filter is capable of realising cutoff frequencies as high as 2 MHz and handles single-ended input signals up to 4 V p-p with less than 1% distortion.

Published in:

Electronics Letters  (Volume:22 ,  Issue: 14 )