A low-voltage CMOS OTA with rail-to-rail differential input range

被引：12
|
作者：
Li, MF [1 ]
Dasgupta, U [1 ]
Zhang, XW [1 ]
Lim, YC [1 ]
机构：
[1] Natl Univ Singapore, Dept Elect Engn, Singapore 119260, Singapore
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-FUNDAMENTAL THEORY AND APPLICATIONS | 2000年 / 47卷 / 01期
关键词：
D O I：
10.1109/81.817382
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This paper describes a novel circuit design technique for a low-voltage CMOS operational transconductance amplifier (OTA) where the output current versus the input voltage relationship is linear for differential input voltage range extended from rail to rail. The input transconducting CMOS transistors operate in the nonsaturation region. A pair of complementary n-type input OTAN and p-type OTAP circuits in conjunction with n-MOS and p-MOS output current mirrors are connected in parallel to implement the rail-to-rail voltage input and push-pull current output. The transconductances gmn and g(mp) of the OTAN and the OTAP are tuned by biasing voltages VDSN and VDSP, respectively. A masterbias generator (with VDSP as input) is used to generate VDSN as output so as to satisfy g(mn) = g(mp) The circuit is capable of operating at supply voltage larger than two times the MOS transistor threshold voltage VT When the supply voltage is 2 V and the MOS transistor threshold voltage is 0.7 V, using SPICE level 3-2 mu m CMOS technology device parameters, the simulation result of the output current deviation from perfect linearity is less than 0.3% for rail-to-rail differential input voltage range.
引用
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页码：1 / 8
页数：8
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