摘要
提出了一种设计CMOS运算跨导放大器(OTA)的新电路结构,这种结构是在基本OTA中引入偏置电流提升电路,故称为电流提升OTA。讨论了电路设计方法,并用3μmP阱CMOS工艺制出了器件样品。测试结果表明,这种新结构OTA在输入信号允许范围、—3dB带宽、转换速率等方面均优于基本OTA。作为一个应用实例,用两个电流提升OTA及两个分立电容组成了二阶高通滤波器,该滤波器的截止频率f_O可由电信号连续调节,其可调范围是从10KHz至300KHz。
A new architecture for CMOS OTA (Operational Transconductance Amplifier) design is presented. This structure adds a bias current booster to the basic OTA to improve electrical performance. The Design method of the new structure is discussed ard model device is fabricated in a 3μm p—well CMOS process. Experimental results are presented which show that the new structure offers larger input signal range, wider —3dB frequency bandwidth and higher slew rate than the basic OTA. The new device is suitable for discrete or monolithic applications. A second order high—pass filter, as an application example, is built using two fabricated OTAs and discrete capacitors, and the filter has a broad cut—off frequency, fo, adjustable range from 10 KHz to 300 KHz.
出处
《天津大学学报》
EI
CAS
CSCD
1989年第2期97-105,共9页
Journal of Tianjin University(Science and Technology)
关键词
放大器
跨导放大器
CMOS
运算
MOS integrated circuits, MOS Operational amplifiers, Transconductance amplifiers.
