CAJ | 학술논문

以 AD630为硬件核心的锁相放大器能够有效的提取出淹没在噪声信号中的微弱有用信号，其高效、准确的特性使其在微弱信号检测方面显示出独特的优势。笔者主要从两个方面对锁相放大器进行了研究与改进：第一，设计一种前置低噪声 LC 谐振放大器，来代替以往锁相放大器所需的前置放大和预滤波部分，以实现放大、滤波合二为一；第二，针对锁相放大器实际输出与期望值之间可能存在误差的问题，设计一种输出信号检测及校正电路，以使输出结果更加贴近期望值。本文最后利用 Proteus 软件对文中所设计的实际电路进行仿真，以验证文中所设计电路的可行性。
이 AD630위경건핵심적쇄상방대기능구유효적제취출엄몰재조성신호중적미약유용신호，기고효、준학적특성사기재미약신호검측방면현시출독특적우세。필자주요종량개방면대쇄상방대기진행료연구여개진：제일，설계일충전치저조성 LC 해진방대기，래대체이왕쇄상방대기소수적전치방대화예려파부분，이실현방대、려파합이위일；제이，침대쇄상방대기실제수출여기망치지간가능존재오차적문제，설계일충수출신호검측급교정전로，이사수출결과경가첩근기망치。본문최후이용 Proteus 연건대문중소설계적실제전로진행방진，이험증문중소설계전로적가행성。
Lock - in amplifier with AD630 as the core of hardware can effectively extract the weak useful signal submerged in noise signals,whose characteristics of being efficient and accurate have shown its unique advantage in weak signal detection. This paper researches the lock - in amplifier mainly from two aspects. First, one kind of pre low noise LC resonant amplifier is designed to replace the parts of pre amplifier and pre filtering required by the past lock - in amplifiers,and to realize the integration of amplifying and filtering. Secondly,one kind of detection and correction circuit of the output signal for the problem of existence of error between actual output value and expected value of the lock - in amplifier is designed to make the actual output value relatively close to the expected value. In the end,the circuits designed in the paper are simulated by using the Proteus software to verify the feasibility of the circuits.