Title :
A novel offset current cancellation technique for switched-current circuits and systems
Author :
Chen, Kuan-Dar ; Kuo, Tai-Haur ; Lee, Shuenn-Yuh
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
This paper presents an unique offset current cancellation technique called “multiple-path feedback compensation (MPFC)” which can greatly reduce offset currents at the output and internal nodes of SI circuits and systems. A 5th-order Chebyshev SI filter is used as an example for the implementation and the verification of the proposed MPFC technique. 90 test chips have been fabricated with a 1 μm CMOS n-well digital process. Increased percentages of the chip area and the power consumption due to the use of the MPFC circuit are 5% and 4%, respectively. Measured results show that the variance of output offset currents is reduced to 2% of its original amount. Besides, the peak signal-to-noise ratio (SNR) is increased by 3 dB and the total harmonic distortion (THD) is reduced by 10 dB
Keywords :
CMOS analogue integrated circuits; Chebyshev filters; active filters; circuit feedback; compensation; harmonic distortion; integrated circuit measurement; switched current circuits; 1 micron; CMOS n-well digital process; Chebyshev SI filter; MPFC technique; chip area; internal nodes; multiple-path feedback compensation; offset current cancellation technique; output nodes; output offset current variance; peak signal-to-noise ratio; power consumption; switched-current circuits; total harmonic distortion; CMOS process; Chebyshev approximation; Circuit testing; Circuits and systems; Current measurement; Digital filters; Distortion measurement; Energy consumption; Output feedback; Semiconductor device measurement;
Conference_Titel :
Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3073-0
DOI :
10.1109/ISCAS.1996.539973
