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Pre-amplifier circuit with a high input resistance

2015-01-06 00:16  
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Pre-amplifier circuit with a high input resistance
The circuits shown in Figures a and b have a high input resistance and low output resistance, and they can be used as a broadband amplifier for oscilloscopes and other test head circuits. Their input and output have the same potential, the voltage amplification factor is 1. Figure c shows the amplitude and phase characteristic curve when the load resistance RL = 50Ω.The main technical indications:Input resistance (25 ℃ pm ) > 10 9 ΩBroadband frequency (-3dB, load resistor RL = 50 Ω ) > 100MHzOutput resistance of < 10 Ω