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The difference amplifier in Figure 3 has resistor values R₁ = R3 = 10 k which are known exactly, however resistors R₂ and R4 are nominally 200 k but have unknown tolerances. In experiment the differential gain was measured to be 26 dB and the CMRR was measured to be 40 dB. Assuming an ideal op-amp determine the input resistance, common mode gain, and the unknown ratio between R₂ and R4 (R₂/R4).

The difference amplifier in Figure 3 has resistor values R₁ = R3 = 10 k which are known exactly, however resistors R₂ and R4 are nominally 200 k but have unknown tolerances. In experiment the differential gain was measured to be 26 dB and the CMRR was measured to be 40 dB. Assuming an ideal op-amp determine the input resistance, common mode gain, and the unknown ratio between R₂ and R4 (R₂/R4).

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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The difference amplifier in Figure 3 has resistor values R₁ = R3 = 10 k which are known exactly, however resistors R₂ and R4 are nominally 200 k but have unknown tolerances. In experiment the differential gain was measured to be 26 dB and the CMRR was measured to be 40 dB. Assuming an ideal op-amp determine the input resistance, common mode gain, and the unknown ratio between R₂ and R4 (R₂/R4). R₁ 10-w R₂ U20-www www.1 R₁ R₂ www Figure 3. Problem 4. 9+
Transcribed Image Text:The difference amplifier in Figure 3 has resistor values R₁ = R3 = 10 k which are known exactly, however resistors R₂ and R4 are nominally 200 k but have unknown tolerances. In experiment the differential gain was measured to be 26 dB and the CMRR was measured to be 40 dB. Assuming an ideal op-amp determine the input resistance, common mode gain, and the unknown ratio between R₂ and R4 (R₂/R4). R₁ 10-w R₂ U20-www www.1 R₁ R₂ www Figure 3. Problem 4. 9+
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