HJS113B Sine Wave Signal Generator Temperature Drift Improvement Experiment

1. Experiment Purpose

Customer usageDuring the use of the HJS113B sine wave signal generator, the customer hopes that we can optimize the output amplitude temperature drift. Our technical personnel organized to reproduce the problem based on customer suggestions and study improvement measures.

2. Product Composition Introduction

HJS113B is an AGC-type Wien bridge oscillation circuit, as shown in Figure 1, which includes two high-performance operational amplifiers, two precision low-temperature drift timing resistors (10kΩ), a precision reference voltage source, rectifying elements,JFET variable resistors and integrators, etc. It generates sine waves using the frequency selection characteristics of RC series and parallel networks and positive feedback, with advantages such as low waveform distortion, stable output signal amplitude, and convenient frequency adjustment. The device is made using improved thick film integrated circuit technology, enhancing its reliability for long-term use in high-temperature environments.

3. Technical Research Data

3.1 Problem Reproduction

Five HJS113B devices were numbered as 1#2#3#4#5#, and then connected according to the circuit shown in Figure 3. Experimental tests recorded the output amplitude data of HJS113B under -55℃~+150℃ conditions as shown in Table 1; data processing curves are shown in Figure 4.5块HJS113B器件分别编号1#2#3#4#5#，后按照图3所示线路连接。经实验测试，HJS113B器件在-55℃~+150℃条件下输出幅度数据记录见表1所示，数据处理曲线见图4所示。

3.2问题改进

根据上述测试记录及曲线图可知，HJS113B在-55℃~150℃区间内输出幅度温漂过大，针对这一现象，我方组织技术人员依设计原理、器件结构等，结合实验现象，对HJS113B采取内部补偿网络进行优化。优化后进行实验，测试数据见表2，数据处理曲线见图5。

 通过表2及曲线图5可知，改进后的HJS113B在-55℃~150℃区间内温漂系数较小，相对于改进前器件的输出幅度温漂有明显改善,其对应的温度区间内温漂系数如表3所示。

四、技术数据分析结论

HJS113B经对补偿网络改进优化后，输出幅度温漂值相对于改进前有较大改善，并且满足用户需求。该器件属于模拟电路，相对于数字正弦波器件具有频带范围宽，抗干扰能力强，尺寸小，外围电路简单等优点。广泛应用于角度传感器和陀螺传感器激励、通讯、工业自动控制、超声波探测等方面。