An integrated low-voltage class AB CMOS OTA

被引：33
|
作者：
Harjani, R [1 ]
Heineke, R [1 ]
Wang, F [1 ]
机构：
[1] Univ Minnesota, Dept Elect Engn, Minneapolis, MN 55455 USA
来源：
IEEE JOURNAL OF SOLID-STATE CIRCUITS | 1999年 / 34卷 / 02期
关键词：
class AB; CMOS operational transconductance amplifier (OTA); current utilization; low voltage;
D O I：
10.1109/4.743753
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：
We present a new circuit topology for a low-voltage class AB amplifier, The circuit shows superior current efficiency in the use of the supply current to charge and discharge the output load, It uses negative feedback rather than component matching to optimize current efficiency and performance, resulting in a current boost ratio exactly equal to one. Measurement results for an example circuit fabricated in a 2-mu m CMOS process are given, The circuit uses a quiescent supply current of 0.2 mu A and is able to settle to a 1% error in 1.1 ms for a 0.4-V input step and a load capacitance of 35 pF. The circuit design is straightforward and modular, and the core circuit can be used to replace the differential pair of other op-amp topologies.
引用
收藏
页码：134 / 142
页数：9
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