In modern electronic devices、In communication equipment and scientific research and production, it is often necessary to use amplification circuits to extract the weak signals output by sensors or the weak signals received in the air by the communication receiving end、Enlarge。Only by amplifying the signal to a certain extent can the requirements of the downstream equipment be met，Make the analysis results correct。At the same time, many devices also require a certain output power，Only in order to drive the downstream equipment or enable the transmitter of communication to effectively transmit m88 slot machine casinothe signal to the receiver。However, facing a variety of amplification requirements，It is difficult for current amplifier circuits to operate within the frequency band、Gain dynamic range、Power and other parameters meet design requirements。The amplifier designed in this project has low noise、High Gain、High bandwidth、And features such as adjustable gain。In order to achieve low noise, this amplifier is built with discrete components (if it is built with an operational amplifier，Noise cannot be controlled)，The first five stages of amplification are built with double-gate field effect transistors，The last stage uses THS3202 operational amplifier for power amplification。Amplifier gain 0-62dB m88 slot machine casinocontinuously adjustable。Signal bandwidth 10KHz-120MHz。The system is low cost，High precision，Meet general production and scientific research experiment requirements，Can be used in many occasions，Promotable。

Picture1  Amplification circuit