Measuring a small AC signal superimposed on a large DC signal requires a preamplifier that could not only remove DC voltage but also maintain low noise. The preamplifier "CMP61102" is a product that satisfies both of these requirements. (Figure 2.) The protection circuit that can input a DC signal of 40V or 80V protects the amplifier from damage caused by large voltage. Electrical Characteristics are shown in Table 2.
Table 2. Electrical Characteristics
|Maximum Input Voltage||±40 V
*Extension to ±80 V is possible
|Input Impedance||100 kΩ|
|Voltage Gain||60 dB|
|Equivalent Input Noise Voltage Density||2 nV/√Hz or less|
|Upper Cutoff Frequency||3 MHz|
|LPF Switching Function
(Upper cutoff frequency setting values)
|7 levels switchable via a rotary switch
10, 100, 1k, 10k, 100k, 1MHz, THRU
|Lower Cutoff Frequency||1 Hz
*can be extended to 0.1 Hz or less
|Maximum Output Voltage||±10 V|
*Please contact us in advance for customized products.