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thistle
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Can anyone tell me how to calculate the common-mode input range of an instrumentation amplifier with all op-amps biased from +15V to -15V assuming all op-amps can swing rail to rail.
Thanks.
Thanks.
The common-mode (CM) input range of an instrumentation amplifier refers to the range of input voltages that can be applied to both of the amplifier's input terminals without causing distortion or damage to the circuit. It is typically specified as a voltage range, such as +/- 10V.
The differential input range of an instrumentation amplifier refers to the range of input voltages that can be applied to the positive and negative input terminals without causing distortion or damage to the circuit. It is typically specified as a voltage range, such as +/- 10V. The CM input range, on the other hand, refers to the range of input voltages that can be applied to both input terminals simultaneously without causing distortion or damage.
The CM input range of an instrumentation amplifier is affected by the supply voltage, the amplifier's input impedance, and the input signal's frequency and amplitude. In general, a larger supply voltage and a higher input impedance will result in a larger CM input range.
If the input voltage applied to both of the amplifier's inputs exceeds the specified CM input range, the amplifier may become saturated or experience clipping, resulting in distorted output signals. In extreme cases, exceeding the CM input range can also cause damage to the amplifier or other components in the circuit.
The CM input range of an instrumentation amplifier can be extended by using external components such as precision resistors or diodes to adjust the input impedance and limit the input voltage. This can help prevent saturation and distortion, allowing for a larger input voltage range. However, it is important to carefully consider the effects on the overall circuit performance before implementing any modifications.