运算放大器广泛应用于电路设计中，其可靠性指标直接影响电路系统的性能。

Operational amplifiers are widely used in circuit design its reliability is of great importance to the performance of circuits.

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本文首先对低场磁共振电路系统的各个功能模块进行了分析，并估算了低场磁共振的信号幅值，然后重点对天线接口和前置放大两个电路模块进行了分析研究。

The function blocks of the low field NMR circuit system are analyzed at first. Then the signal amplitude is calculated. The antenna interface and the preamplifier are studied in detail at last.

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