Design and simulation of fourth order low-pass Gm-C filter with novel auto-tuning circuit in 90 nm CMOS

被引:8
|
作者
Abdolmaleki, Mohammad [1 ]
Dousti, Massoud [2 ]
Tavakoli, Mohammad Bagher [1 ]
机构
[1] Islamic Azad Univ, Arak Branch, Dept Elect Engn, Arak, Iran
[2] Islamic Azad Univ, Dept Elect & Comp Engn, Sci & Res Branch, Tehran, Iran
关键词
Gm-C filter; Equiripple linear-phase; OTA; Automatic tuning circuit; CMOS inverters; CMFB; LINEARIZATION TECHNIQUE; OTAS; SUBTHRESHOLD; LINEARITY; GAIN;
D O I
10.1007/s10470-020-01785-9
中图分类号
TP3 [计算技术、计算机技术];
学科分类号
0812 ;
摘要
A tunable high-frequency operational transconductance amplifier (OTA) is presented along with its application in the implementation of a Gm-C filter. The OTA is tuned by varying the negative resistance produced by a positive feedback at the output. Post-layout simulation results (using TSMC 90 nm CMOS technology and a 1-V supply voltage) show that the differential DC gain, common-mode gain and OTA unity gain frequency are 34 dB, -26 dB and 10 GHz, respectively. Moreover, for precise control of filter performance, an auto-tuning circuit is presented to adjust the filter cutoff frequency at low power consumption (i.e., 0.6 mW, about 16.3% of the total circuit power consumption). The filter has a cutoff frequency of 1 GHz with a group delay variation less than 6% up to 1.3 f(c). The size of filter is 0.040 x 0.023mm(2) and the third order intermodulation (IM3) value at cutoff frequency is -37 dB. The Monte Carlo simulation results are presented for predicting the manufacturing process errors.
引用
收藏
页码:451 / 461
页数:11
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