BENTLY 149992-01 前置器
BENTLY 149992-01前置放大器在放大有用信号的同时也将噪声放大,低噪声前置放大器就是使电路的噪声系数达到最小值
的前置放大器。 对于微弱信号检测仪器或设备,前置放大器是引入噪声的主要部件之一。 整个检测系统的噪声系数主要取
决于前置放大器的噪声系数。仪器可检测的最小信号也主要取决于前置放大器的噪声。BENTLY 149992-01 前置放大器一
般都是直接与检测信号的传感器相连接,只有在放大器的最佳源电阻等于信号源输出电阻的情况下,才能使电路的噪声系
数最小。 前置放大器的作用 1提高系统的信噪比(前放紧靠探测器,传输线短,分布电容Cs减小,提高了信噪比)2.减少外
界干扰的相对影响(信号经前放初步放大.)3.合理布局,便于调节与使用(前放为非调节式,主放放大调节倍数、成形常数)
BENTLY 149992-014.实现阻抗转换和匹配(前放设计为高输入阻抗,低输出阻抗) 分类 电压灵敏前放(电压放大器) 电荷灵敏
前放(带有电容负反馈的电流积分器)输出增益稳定、噪声低、性能良好 电流灵敏前放(电流前放,并联反馈电流放大器) 快响应,
可获得时间信息。可远距离传输。输出脉冲上升时间和宽度窄,适合高计数率测量。
BENTLY 149992-01 preamplifier amplifies the noise as well as the useful signal. Low noise preamplifier is to minimize
the noise figure of the circuit.Pre-amplifier of. For weak signal detection instruments or equipment, preamplifier is one of
the main components to introduce noise. The noise figure of the whole detection system mainly takesDepends on the
noise figure of the preamplifier. The minimum signal detectable by the instrument mainly depends on the noise of the
preamplifier. BENTLY 149992-01 preamplifier IAre directly connected with the sensor that detects the signal. Only
when the optimal source resistance of the amplifier is equal to the output resistance of the signal source can the noise
of the circuit be reduced.Minimum number. The role of the preamplifier 1. Improve the signal-to-noise ratio of the system
(the preamplifier is close to the detector, the transmission line is short, the distributed capacitance Cs is reduced, and
the signal-to-noise ratio is improved) 2. Reduce the externalThe relative influence of interference (the signal is preliminarily
amplified by the front amplifier.) 3. Reasonable layout, easy to adjust and use (the front amplifier is non-adjustable, and
the main amplifier amplifies the adjustment multiple and forming constant).BENTLY 149992-014. Realization of impedance
conversion and matching (preamplifier is designedwith high input impedance and low output impedance) Classification
Voltage sensitive preamplifier (voltage amplifier) is charge sensitiveThe preamplifier (current integrator with capacitor negative
feedback) has stable output gain, low noise and good performance. The current-sensitive preamplifier (current preamplifier,
parallel feedback current amplifier) has fast response.Time information can be obtained. It can be transmitted over a long distance.
The rise time and width of the output pulse are narrow, which is suitable for high counting rate measurement.
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