A log amplifier, which may spell log as logarithmic or logarithm and which may abbreviate amplifier as amp or be termed as a converter, is an electronic amplifier that for some range of input voltage has an output voltage approximately proportional to the logarithm of the input:

如果考虑等式Y = log(X)，我们会发现，每当X乘以常数A，Y则按另一个常数A1递增。 因 此，如果log(K) = K1，则log(AK) = K1 + A1，log(A 2 K) = K1 + 2A1且log(K/A) = K1 – A1。

There are three basic architectures which may be used to produce log amps: the basic diode log amp, the successive detection log amp, and the "true log amp" which is based on cascaded semi-limiting amplifiers. The voltage across a silicon diode …

Figure 1 shows an amplifier that provides a logarithmic output for a linear input current or voltage. For input currents, the circuit will maintain 1% logarithmic conformity over almost six decades of operation. This circuit is based, as are most logarithmic circuits, on the inherent logarithmic relationship between collector current and V in.

2012年2月24日 · Log amplifier is a linear circuit in which the output voltage will be a constant times the natural logarithm of the input. The basic output equation of a log amplifier is v Vout = K ln (Vin/Vref); where Vref is the constant of normalisation, and K is the scale factor.

The term log amp, as it is generally understood in communications technology, refers to a device which calculates the log of an input signal's envelope. What does that mean in practice? Take a look a the scope photo below.

2017年8月2日 · This feature will describe the applications and characteristics of log amps, pin point key parameters, advise on how to select a log amp, and provide examples of log amps and their typical application.

2019年3月21日 · 对数放大器输出使用附加两个运算放大器中的一个进行调节，以产生传递函数公式：V OUT = -0.249 x log (I1 / I2) + 1.5 伏。 总结 无论是基带还是射频，对数放大器都为设计人员提供了一种用于处理宽动态范围信号的技术。

A logarithmic amplifier, or a log amplifier, is an electronic circuit that produces an output that is proportional to the logarithm of the applied input. This section discusses about the op-amp based logarithmic amplifier in detail.

2007年7月9日 · 这种能够计算输入信号之实时对数的组件，被称为基频对数放大器（baseband log amp）（也有人称为”真实对数放大器（true log amp）”）。 然而，此处所讨论的焦点是包络侦测对数放大器（envelope-detecting log amp），也可以称为解调变对数放大 …