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利用电子注作非线性元件的参量放大器可分为二大类型。由爱斯基创设的利用直向电子注快空间电荷波的参量放大器称为纵向电子注参量放大器。由爱德列尔发展的另一种四极放大器称为横向电子洼参量放大器。
The use of electronic injection as a nonlinear component of the parametric amplifier can be divided into two major types. A parametric amplifier created by Eski that utilizes direct electron injection of fast space charge waves is called a longitudinal electronic parametric amplifier. Another type of quadrupole amplifier developed by Adriel is called a transverse electronic depression variable amplifier.