Question

An instrumentation amplifier has a high

• A. \( \text{Output impedance} \)
• B. \( \text{CMRR} \)
• C. \( \text{Input offset currents} \)
• D. \( \text{Supply voltage} \)

Hint:

Instrumentation amplifiers are specialized differential amplifiers commonly used in medical and industrial applications for accurate signal acquisition. Their primary advantages include very high input impedance, low output impedance, and, most importantly, high CMRR, which allows them to amplify small differential signals while rejecting common-mode noise.

Answer 1

The Correct Option is B

An instrumentation amplifier is designed for precise, low-level signal amplification. One of its key characteristics is a high Common-Mode Rejection Ratio (CMRR). A high CMRR ensures that the amplifier effectively rejects common-mode noise, which is crucial for accurate measurement in noisy environments. While instrumentation amplifiers generally have high input impedance and low output impedance, a high CMRR is a defining characteristic for its application in measurement systems. High input offset currents are undesirable as they introduce errors, and supply voltage is a power requirement, not a performance characteristic that is "high" in the sense of being a desirable feature in the same way CMRR is.