| Autors: Pandiev, I. M. Title: Analysis and Design of Bipolar Programmable-Gain Amplifiers Using Digital Potentiometers Keywords: analog circuits; amplifiers; gain control; digital poten-tio Abstract: This paper presents a theoretical analysis and design procedure of versatile programmable amplifier circuits with bipolar gain. In particular, under analysis are two basic electronic circuits of single- and two-stage bipolar programmable-gain amplifiers employing monolithic CMOS digital potentiometers. For both circuits, a single digital potentiometer is connected as a voltage divider in the negative feedback network of an op-amp. As a result of adjusting the position of the wiper of the potentiometer, the depth of the feedback changes, and hence the voltage gains change. Based on theoretical analysis of the circuits, analytical expressions for the basic static and dynamic parameters are derived. Moreover, using those formulas approaches for selecting an appropriate circuit configuration and recommendations for selecting passive and active component values are proposed. References Issue
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Вид: публикация в национален форум с межд. уч., публикация в реферирано издание, индексирана в Scopus и Web of Science
