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本文提出了一种可用于热释电红外探测技术的基于跨导运算放大器(OTA)且唯一有源器件的全波整流电路,该电路利用OTA的差分放大特性,明显改善了普通运放整流电路引起的输出波形过零失真。针对普通OTA输入信号范围小的缺点,提出补偿OTA全波整流电路,不仅扩大了输入信号范围,同时通过调节偏置电流可实现整流后信号再次放大。给出了仿真结果并用于大信号宽频带热释电红外探测电路,实验证明电路工作稳定,整流输出达到预期效果。
This paper presents a full-wave rectifier circuit based on transconductance operational amplifier (OTA) and the only active device that can be used for pyroelectric infrared detection technology. This circuit makes use of the differential amplification characteristic of OTA and obviously improves the common operational amplifier rectifier circuit Caused by the output waveform zero crossing distortion. Aiming at the shortcoming of small input signal range of ordinary OTA, the compensation OTA full-wave rectification circuit is proposed, which not only expands the input signal range but also amplifies the rectified signal by adjusting the bias current. The simulation results are given and applied to large-signal broadband pyroelectric infrared detection circuit. The experiment proves that the circuit works stably and the rectified output achieves the expected result.