Microwave Two-way Intelligent Amplifier Design And Research

A microwave bidirectional smart amplifier applied for wireless local area network of IEEE802. 11b/g agreement in the frequency of 2. 4GHz to 2. 5GHz is designed, fabricated and measured in this thesis. This smart amplifier includes detector, power amplifier, low noise amplifier, voltage-controlled attenuator and power-controlled circuit, to extend Access Point and enlarge application area of wireless local area network. The power-controlled circuit is used to control linear dynamic range of the power amplifier, and keep stable output power 27dBm.The power-controlled circuit controls the circuit and at the same time it controls the switches to transmitting circuit or receiving circuit automatically. The power amplification part is made up of RF2126 and RF2128P power amplifier IC and the output power is larger than 27dBm after being enlarged. The design of low noise amplifier is the keystone of this thesis, ATF-35143 and AT-30511 are used for two stage low noise amplifier, and the gain is larger than 20dB, noise figure is 1.3dB. The startup voltage of transmitting circuit is larger than 10dBm, after the switch loss is deducted, the output power is about 27dBm, the whole gain of the receiving circuit is about 17dB and the noise figure is smaller than 3. 5dB.