A low-noise preamplifier is required for measurement. When making a low-noise preamplifier, for applications where
the signal source of
the sensor
has low
resistance
, a bipolar input type OP amplifier (AD797, OP27, etc.) with low equivalent input noise voltage is selected, and a low resistance value (less than several hundred Ω) is used for the gain setting
resistors
R1 and R2. The figure below is an example of a 600Ω audio low-noise amplifier.
Reference address：Use low resistor values in low noise preamplifiers
When the output amplitude of the preamplifier is below 1V, the post-amplifier with a 20dB amplifier can be connected to the next stage to amplify it to a level of several V. This can reduce the thermal noise generated by the resistor R (in the case of R1 and R2 in parallel). By the way, the noise of the resistor at room temperature is
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Figure 600Ω Line Audio Low Noise Amplifier
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