Patent ID: 8339199

Claim:
A pre-amplifier, comprising: at least two PMOS transistors as source followers and two NMOS transistors as amplifiers, or at least two NMOS transistors as source followers and two PMOS transistors as amplifiers for increasing or decreasing voltage; at least four tail current sources with same current value, wherein a charging and discharging current of a load capacitor of two output terminals Out_p and Out_n are adjusted according to a differential voltage of two input terminals V INN and V INP ; two diodes; and a receiver, wherein if two PMOS transistors are used as source followers to make input signals follow the source so as to increase the voltage of input signals and two NMOS transistors are used as current switches to turn on and control the gate-source voltage of the two NMOS transistors, wherein the two diodes are used to attain the minimum clamping voltage and the receiver is used to process the preamplified signals with its input as the equivalent of two equal load capacitors of the preamplifier.