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近几年来,在无线电广播和放大技术上,常常采用一种新型的串接放大器,它具有高的输入内阻、小的固有噪声以及稳定性良好和较大的电压增益.在串接放大器中,可以很方便地采用深度负反馈,从而可以对某些频率进行选择放大.这种电路广泛地使用在高频、中频和低频前置放大的输入级中.串接放大器具有许多形状的变态电路,如怀特阴极输出器、推挽并联输出器、动态板极负荷放大器等等.各种电路的组合,可以构成不同的用途,现将串接放大器的结构、原理、用途分述如下:
In recent years, radio broadcasting and amplifying techniques, often using a new type of cascaded amplifier, which has a high input resistance, small natural noise and good stability and larger voltage gain in the cascode amplifier , Deep negative feedback can be easily used to selectively amplify certain frequencies that are widely used in the input stages of high frequency, intermediate frequency, and low frequency preamplifiers. Cascaded amplifiers have many shapes of metamorphic circuits , Such as the White cathode output device, push-pull parallel output device, dynamic board polar load amplifier, etc. The combination of various circuits can constitute different uses, now concatenated amplifier structure, principles, uses are described below: