一、引言参量放大器具有低噪声特性。但由于它窄带特性往往使其应用受到一定的限制。宽带参量放大器同窄带参量放大器相比,不论在相位特性方面还是在工作稳定性方面都有很大的改善。特别是工作在常温的宽带参量放大器,由于它不用庞大复杂的致冷系统,应用起来就更为方便。因此,在对相位有一定要求的微波接收机中使用宽带常温参量放大器是有一定的使用 I. Introduction Parametric amplifiers have low noise characteristics. However, due to its narrowband characteristics, its application is often limited. Wideband parametric amplifier with narrowband parametric amplifier, both in terms of phase characteristics and work stability have greatly improved. Especially at room temperature broadband parametric amplifier, because it does not require large and complex refrigeration system, the application is more convenient. Therefore, there are certain requirements on the phase of the microwave receiver using a broadband temperature parametric amplifier is a certain use