Which of the following options does not define a high quality instrumentation amplifier?
a) High CMRR
b) High offset voltage
c) High input impedance.
d) low output impedance
b) High offset voltage
The correct answer is b) High offset voltage.
A high-quality instrumentation amplifier is designed to accurately amplify small signals while rejecting common-mode noise. It typically has the following characteristics:
a) High common-mode rejection ratio (CMRR): CMRR is a measure of how well the amplifier rejects unwanted signals that are common to both inputs. A high CMRR means that the amplifier is effective at rejecting common-mode noise.
b) Low offset voltage: A high-quality instrumentation amplifier should have a low offset voltage, which is the voltage difference between the input terminals when the voltage difference at the output terminals is zero. A low offset voltage means that the amplifier accurately amplifies small signals without introducing any additional offset.
c) High input impedance: The input impedance of an instrumentation amplifier should be high to minimize the loading effect on the signal source and maintain signal integrity.
d) Low output impedance: The output impedance of an instrumentation amplifier should be low to drive the load effectively and prevent signal attenuation.
Based on these characteristics, option b) stands out as it does not define a high-quality instrumentation amplifier.