详细的噪声测试电路。热滞后 Q1-Q2 低噪声 JFET 对由 A1-Q3 进行直流稳定,A2 提供 A = 10,000
前置放大器输出。 A3-A4 形成 0.1Hz 至 10Hz,A = 100,带通滤波器,前置放大器输入的总增益为 106。
峰峰值噪声
检测器,通过监视示波器扫描门复位,提供 DVM 输出
说明
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Detailed noise test circuitry. Thermally lagged Q1-Q2 low noise JFET pair is DC stabilized by A1-Q3, A2 delivers A = 10,000 preamplifier output. A3-A4 form 0.1Hz to 10Hz, A = 100, bandpass filter, total gain referred to pre-amplifier input is 106. Peak-to-peak noise detector, reset by monitoring oscilloscope sweep gate, supplies DVM output