Abstract
The work mainly by the front level attenuator, the LC tuned amplifier, the push-pull output stage is composed. The first level weakens 40dB fixedly through pi the attenuator realization. Front the double grid field effect manages 3SK223 to make the level to increase the controllable LC tuned amplifier, the LC resonance by double harmonious and the list harmonious cascade way, enhanced the system selectivity. The complete machine gain is bigger than the 80dB, AGC control area to achieve above 60dB.The output stage uses the low pressure high electric current high speed axle to the axle structure integration operational amplifier OPA2354 push-pull transformer coupling output, sharpened the belt load capacity greatly. In order to reduce the amplifier as far as possible the noise and ceases the high frequency auto excitation, this design has adopted the power source filter, the shield, electromagnetic compatibility, the interstate coupling, the impedance matching and so on many kinds of measures. After the test, this plan has completed completely the basic function and the expansion function. Sweeps the frequency source turning on input end after CPLD self-made DDS, May very convenient see the system frequency response on the oscilloscope.
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