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15MHz wide tuning-range OTA with −69dBHD3 and its application to Gm-C filter

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3 Author(s)
Jun-Ye Lin ; Dept. of Electr. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Wei-Hsiu Chang ; Chung-Chih Hung

This paper presents a high linearity operational transconductance amplifier (OTA). The OTA circuit combines the techniques of the double differential pairs (DDP) and Source-degenerated current mirrors to achieve high linearity in a large GM tuning range. With the Gm values ranged from 60μS to 130μS, the HD3 of the OTA is below -69dB at 15MHz. The OTA has been applied to a fourth-order linear phase low-pass filter for high speed system. The fourth-order low-pass filter with the cutoff frequency of 15MHz has been implemented. The filter is designed by 0.18-μm CMOS process technology, the HD3 performance is about -53dB, and the group delay variation is below 5% at cutoff frequency.

Published in:

VLSI Design, Automation and Test (VLSI-DAT), 2011 International Symposium on

Date of Conference:

25-28 April 2011