Title :
Switched current filters
Author :
Hughes, J.B. ; Macbeth, I.C. ; Pattullo, D.M.
Author_Institution :
Philips Res. Labs., Redhill, UK
fDate :
4/1/1990 12:00:00 AM
Abstract :
`Switched Currents´ is a new analogue sampled-data signal processing technique that can be implemented without the need for linear floating capacitors. This feature enables signal processors to be integrated in a standard digital VLSI process (CMOS), making the technique ideally suited for mixed analogue/digital ICs. Switched current cells are described, and a configuration for a universal integrator is developed that is exactly equivalent to a switched capacitor counterpart. With this integrator, complete switched current filters may be constructed from switched capacitor prototypes. This is demonstrated by the `exact´ design and simulation of a sixth order lowpass filter with a cutoff frequency of 5 MHz
Keywords :
CMOS integrated circuits; VLSI; active filters; integrating circuits; linear integrated circuits; switched filters; CMOS; analogue sampled-data; cutoff frequency; mixed analogue/digital ICs; monolithic active filters; signal processing technique; sixth order lowpass filter; standard digital VLSI process; switched capacitor prototypes; switched current filters; universal integrator;
Journal_Title :
Circuits, Devices and Systems, IEE Proceedings G
