INSTRUMENTATION AMPLIFIER WITH DIGITAL GAIN PROGRAMMING AND COMMON-MODE REJECTION TRIM

被引：1
|
作者：
VYROUBAL, D
机构：
[1] Jugoturbina-Inst, Karlovac
来源：
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 1990年 / 39卷 / 04期
关键词：
D O I：
10.1109/19.57238
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 design for an instrumentation amplifier with digitally programmable gain and common-mode rejection (CMR) trim is presented. A standard multiplying D/A converter (DAC) is used as the differential feedback control element, and the common-mode rejection is provided by four resistors in a configuration equivalent to a balanced bridge. Digital CMR adjustment is established after another bridge-balancing DAC has been added to the basic circuit. Detailed circuit analysis proves that excellent offset and drift cancellation follows from the proper pairing of four op amps used in the circuit. Feasibility of amplifier integration into a single chip is also discussed.
引用
收藏
页码：588 / 593
页数：6
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