Widely programmable high-frequency continuous-time filters in digital CMOS technology
- 1 April 2000
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 35 (4) , 503-511
- https://doi.org/10.1109/4.839910
Abstract
We present design considerations for programmable high-frequency continuous-time filters implemented in standard digital CMOS processes. To reduce area, accumulation MOS capacitors are used as integrating elements. The filter design problem is examined from the viewpoint of programmability. To allow frequency scalability without deterioration of noise performance and of the frequency response shape, we employ a technique called "constant-capacitance scaling," which assures that even parasitic capacitances remain invariant when transconductors are switched in and out of the filter. This technique is applied to the design of a programmable fourth order Butterworth continuous-time filter with a bandwidth programmable from 60 to 350 MHz implemented in a 0.25-/spl mu/m digital CMOS process. The filter has a dynamic range of 54 dB, dissipates 70 mW from a 3.3-V supply, and occupies an area of 0.15 mm/sup 2/.Keywords
This publication has 16 references indexed in Scilit:
- Modeling of accumulation MOS capacitors for analog design in digital VLSI processesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003
- A CMOS biquad at VHFPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Time-scaled electrical networks. Properties and applications in the design of programmable analog filtersIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 2000
- A CMOS continuous-time G/sub m/-C filter for PRML read channel applications at 150 Mb/s and beyondIEEE Journal of Solid-State Circuits, 1997
- Low-power CMOS continuous-time filtersIEEE Journal of Solid-State Circuits, 1996
- A CMOS transconductance-C filter technique for very high frequenciesIEEE Journal of Solid-State Circuits, 1992
- Design of a 15-MHz CMOS continuous-time filter with on-chip tuningIEEE Journal of Solid-State Circuits, 1991
- Transistor-only frequency-selective circuitsIEEE Journal of Solid-State Circuits, 1990
- Design considerations for high-frequency continuous-time filters and implementation of an antialiasing filter for digital videoIEEE Journal of Solid-State Circuits, 1990
- MOS transconductors and integrators with high linearityElectronics Letters, 1986