A Micropower Class-AB CMOS Log-Domain Filter for DECT Applications

This paper presents a micropower second-order low-pass filter using the log-domain principle and integrated in a 0.35-μm CMOS process. It has been designed as an antialiasing filter for a DECT transceiver with a 45-kHz nominal cutoff frequency. The circuit uses transistors biased in weak inversion without requiring separate wells. It operates at 1.5-V supply voltage and its current consumption is 8 μA in idle mode. The log-domain filter is implemented with an on-chip conditioner which allows class-AB operation. It can process input currents at 5 kHz that are 25 times larger than the 200-nA bias current. Measurements up to 500 times the bias current have been done, since at 1 kHz the input current is only limited by the supply voltage.


Published in:
IEEE Journal of Solid-State Circuits, 36, 7, 1067-1075
Year:
2001
ISSN:
00189200
Keywords:
Other identifiers:
Scopus: 2-s2.0-0035392692
Laboratories:




 Record created 2010-06-24, last modified 2018-12-03


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)