Low-Power Class-AB CMOS Voltage Feedback Current Operational Amplifier With Tunable Gain and Bandwidth

被引：19
|
作者：
Esparza-Alfaro, Fermin [1 ]
Pennisi, Salvatore [2 ]
Palumbo, Gaetano [2 ]
Lopez-Martin, Antonio J. [1 ]
机构：
[1] Univ Publ Navarra, Dept Elect & Elect Engn, Pamplona 31006, Spain
[2] Univ Catania, DIEEI, I-95125 Catania, Italy
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2014年 / 61卷 / 08期
关键词：
Class AB; CMOS analog integrated circuits; current amplifier; current conveyor; current mirror; current mode (CM); operational amplifiers; quasi-floating gate transistor; voltage feedback current operational amplifier (VFCOA); CURRENT-MODE CIRCUITS; CURRENT CONVEYOR; CURRENT MIRROR; OUTPUT STAGES; DESIGN;
D O I：
10.1109/TCSII.2014.2327390
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：
A CMOS class-AB variable-gain voltage feedback current operational amplifier (VFCOA) is presented. The implementation is based on class-AB second-generation current conveyors and exploits an electronically tunable transistorized feedback network. The circuit combines high linearity, low power consumption, and variable-gain range from 0 to 24 dB with nearly constant bandwidth, tunable from 1 to 3 MHz. A prototype has been fabricated in 0.5-mu m technology and occupies a total area of 0.127 mm(2). The VFCOA operates using a 3.3-V supply with static power consumption of 280.5 mu W. Measurements for maximum gain configuration show a dynamic range (1% THD at 300 kHz) of 87.5 dB and a THD lower than -40 dB for an output current 23 times the bias current.
引用
收藏
页码：574 / 578
页数：5
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