Lock_in_amplifier

Published:2009/7/23 23:19:00 Author:Jessie | From:SeekIC

carrier-modulated output of the signal source. Because the desired signal information is contained within the carrier, the system constitutes an extremely narrowband amplifier. Noncarrier related components are rejected, and the amplifier passes only signals, which are coherent with the carrier. The amplifier can extract a signal 120 dB below the noise level. The signal source is a thermistor bridge, which detects extremely small temperature shifts in a biochemical microcalorimetry reaction chamber. To trim, adjust the phase potentiometer so that switching occurs when the carrier crosses through zero.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Amplifier_Circuit/Lock_in_amplifier.html

Print this Page | Comments | Reading(3)