Design on Low-noise Preamplifier

Pyroelectric detector's output signal is very weak,so the response rate is low,the pre-amplifier must be used in conjuction in order to improve the response rate,so pre-amplifier'noise impact on response rates great.The paper starts from requirements of the pyroelectric detector to the preamplifier and proposes a method that how to reduce the noise of pre-amplifier to improve the response rate from the noise matching method,the selection of passive components and shielding and grounding of the pre-amplifier.