通用可变增益放大器
内容摘要：跟着增益控制放大电路技术的不断发展和科学技术的不断进步,根据放大器的特性在自动测控领域、智能测控领域、智能设备等方面有着举足轻重的作用，在一些重要领域的应用也比较广泛。

可变增益放大器的增益方式主要有：连续变化和非连续变化两大种类。

实际改变增益方有许多种方法，每种方法都各有各自的特点，各有各的优势，各有其优点和缺点。

根据理论可分析,如果要改变通用可变增益放大器反馈控制电路的电阻和控制电路的输入电阻,都可以有效改变增益的效果。

如果仅是简单地改变控制电路的电阻和控制电路的输入电阻，这样的可变增益放大器往往性能不是很好，有的甚至不能很好的正常运行。

所以通用可变增益放大器的选择和使用是非常关键的且意义重大。

关键词：增益放大器自动测控集成运算放大器
General variable amplifier design
Abstract:With the continuous and control, intelligent measurement and control, intelligent instruments and meters and other important is becoming more and more widely in the field of application. Variable gain amplifier gain change ways mainly have artificial (or machinery) and programmable two categories (the latter usually with the aid of mu P), there are many types of specific methods, each method has its advantages and limitations. In theory, change the integrated operational amplifier (op amp) feedback resistance or input resistance, can change the gain of the amplifier. But simply change the feedback resistance or input resistance of variable gain amplifier, often do not have the ideal performance, some can't normal use. From the perspective of application, the realization method of typical variable gain amplifier is given to the correct selection and use of variable gain amplifier has a guiding significance.
Keywords: Variable gain amplifier Automatic measurement and control Integrated operational amplifier
前言 (1)
1 通用可变增益放大器的概述 (5)
1.1 可变增益放大器的研究意义 (5)
1.2 可变增益放大器的发展趋势 (7)
2 通用可变增益放大器的基础 (8)
2.1 增益放大器的分类 (8)
2.2 增益控制 (8)
2.2.1 指数增益控制 (9)
2.3 高性能可变增益放大器 (12)
3 增益放大器的结构 (13)
3.1 可变增益放大器的原理 (13)
3.2 吉儿伯特VGA (13)
3.2.1 指数性质VAG (15)
3.2.2 VAG结构 (15)
4 增益放大器的设计 (16)
4.1 程控放大器设计 (16)
4.2 控制电路的设计 (17)
5 结束语 (18)
参考文献 (19)。