Multiplier is the circuit which is conformed of nonlinear elements and can make two signal multiplied so that it can implement frequency transformation.
相乘器是由非线性元件组成，可以实现两个信号的相乘，完成频率变换的电路。
A preprocessing circuit is designed for analog signal transformation because of large inner impedance of biosensor and bipolar signal.
针对采用的生物传感器内阻高、信号弱、双极性等特点，用预处理电路对模拟信号进行了变换。
Signal channel consists of attenuating circuit, impedance transformation circuit and amplification circuit.
信号通道由衰减电路、阻抗变换电路、放大电路等电路组成。
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