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63 What is the AC amplifier? Why should the circuit with multi-level AC amplifier?

In Electronic Infomation Category: 6 | on February 07,2012

AC signal can be amplified as AC amplifier circuit. Common AC amplifier are: fixed bias type, voltage negative feedback, current negative feedback, negative feedback and 63 datasheet and hybrid twin-tube direct-coupled 5 kinds.

in industrial automation and 63 price and wireless technologies, are often encountered in many signal is very weak, to thousands of times magnification, or even a million times or more to drive the load, this signal by single-stage amplifier is not competent. The multi-stage amplifier of the total magnification factor equal to the product of the amplifier at all levels, so the total magnification can do much. See from the performance of the circuit, doing multiple single-stage amplifier is too large, stability and 63 suppliers and signal to noise ratio necessary to check the bad, negative for signal amplification. Therefore, often using a variety of negative feedback to improve the amplifier performance. Multi-stage amplifier is conducive to adding a variety of negative feedback, and can be arranged before and after reasonable levels of focus. Such as the focus of pre-decorated amplifier amplifies the signal voltage, the middle-class amplifier amplified voltage based on the appropriate amplification current, the final stage of mainly current amplification (power amplifier). This will help get good enlargements.

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