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Article: Designing with op amps: single-formula technique keeps it simple.(operational amplifiers)
- Article from:
- EDN
- Article date:
- March 2, 1998
- Author:
CopyrightCOPYRIGHT 1998 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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A simple single-op-amp design technique uses one formula--[R.sub.F]/|gain|--for both positive and negative gains. The procedure works for all gain settings and produces designs with minimal bias-current error.
Numerous texts and application notes describe the design of op-amp circuits. Most designers use the [R.sub.F]/[R.sub.I] formula for inverting amplifiers and the 1+[R.sub.F]/[R.sub.I] formula for noninverting amplifiers, where [R.sub.F] and [R.sub.I] are the feedback and input resistors, respectively. These two formulas have been the basis of op-amp design for many years. Why learn a new procedure? One reason is that the new procedure is simple in that it uses ...