摘要
描述了一种可数字精细控制增益放大器的结构和设计方法,它可以用高分辨率电流型D/A转换器和运算放大器实现,调试容易,外接元件少,可以方便地和计算机接口.放大器增益的线性好、精度高,既可放大又可衰减,动态范围达100dB以上.阐述了放大器的工作原理,给出了采用AD7547和OP37的设计实例,讨论了放大器的频率响应及其增益分配等.
The construction and design method are described for the digital programmable high resolution g ain-co ntrolled amplifier,which consists of a D/A converter,two operational amplifiers and a few passive elements. It has good linear, high resolution, easy interface with a computer,a dynamic range over (110 dB_.The principle and design example using AD7547 and OP37 are given,and the frequency response and gain distribution of amplifier are also discussed.
出处
《西北师范大学学报（自然科学版）》
CAS
2004年第3期35-37,共3页
Journal of Northwest Normal University(Natural Science)
关键词
程控增益放大器
高精度增益控制
D/A转换器
放大器设计
program g ain-con trolled amplifi er(PGA)
high resolution ga in-con trolled
D/A converter
amplifier design
