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功率稳幅系统已经成为微波扫频仪必不可少的组成部分.因为它不仅可以使扫频仪在整个频段内提供平直的输出功率特性,同时改善了信号源的源匹配,从而扩展了运用范围.已为W004型微波扫频仪研制成自动电平控制系统.系统由自动电平控制放大器和射频通路两大部分构成.自动电平控制放大器由三个负反馈放大单元级联而成,总增益为1700倍.选用经过老化处理、特性接近的晶体管担任第一放大单元的差分输入级,并引入了相位校正网络,同时保证了系统的稳定和工作带宽.
The power stabilizer system has become an integral part of the microwave sweeper because it not only allows the sweeper to provide flat output power characteristics across the frequency band but also improves the source match of the signal source, Range has been developed for the W004 microwave sweep automatic level control system.The system consists of automatic level control amplifier and RF path composed of two parts.Automatic level control amplifier consists of three negative feedback amplification unit cascade, The total gain of 1700 times.After aging treatment, close to the characteristics of the transistor used as the first amplification unit of the differential input stage, and the introduction of the phase correction network, while ensuring system stability and bandwidth.