什么是开尔文连接？
A：开尔文连接是一种用于模拟信号远传的连接方法。其特点是不在驱动器的输出端直接连接反馈到反相端，而从负载端将反馈接到放大器/驱动器的反相端的一种连接方法，其目的是减小线路电阻引起的误差。如图1是ADI的AD688的datasheet中开尔文连接图。
图1
原文介绍如下（翻译仅供参考）：
KELVIN CONNECTIONS
Force and n connections, also referred to as Kelvin connections, offer a convenient me
thod of eliminating the effects of voltage drops in circuit wires. As en in Figure 9a, the load current and wire resistance produce an error (VERROR = R×IL) at the load. The Kelvin connection of Figure 9b overcomes the problem by including the wire resistance within the forcing loop of the amplifier and nsing the load voltage. The amplifier corrects for any errors in the load voltage. In the circuit shown, the output of the amplifier would actually be at 10 volts + VERROR and the voltage at the load would be the desired 10 volts.
所说的开尔文连接是指驱动端和感测端的连接，它提供了抵消线路压降的便利方法。见图9.a，负载电流和线路电阻会使负载产生一个误差压降（VERROR = R×IL）。而如图9.b所示的开尔文连接会产生一个克服包括由放大器驱动环路的线路电阻在内的难题。（***nsing the load voltage暂时理不清它的意思指什么***） （放大器通过感测负载电压），放大器会纠正任何负载电压的误差。如图中所示，放大器的输出实际上是10V＋VERROR ，而负载得到的却是期望的10V。
The AD688 has three amplifiers which can be ud to implement Kelvin connections. Am
plifier A2 is dedicated to the ground force-n function while uncommitted amplifiers A3 and A4 are free for other force-n chores.
AD688有3个可以用于开尔文连接的放大器。放大器A2专门用于the ground force-n 而无定制放大器A3和A4则可以做为其它“驱动-感测”事务之用。（****详见后面的图2，即原文件的图2.a）
In some applications, one amplifier may be unud. In such cas, the unud amplifier should be connected as a unity-gain follower (force and n pins tied together) and the input should be connected to ground.
（这两个无定制放大器）在某些应用中，有一个可能不会用到。同样的原因，不用的放大器应当成单位增益跟随器（驱动端和感测端接到一起），且其输入端应接地。
An unud amplifier may be ud for other circuit functions as well. The curves on this page show the typical performance of A3 and A4.
未使用的放大器最好用于电路的其它功能，本页上就有放大器A3和A4的典型性能曲线。
图2
开尔文连接.gifAD688内部框图.gif 个别地方一时译不动，请原谅。
Q048：什么是开尔文连接？
A：开尔文连接是一种用于模拟信号远传的连接方法。其特点是不在驱动器的输出端直接
连接反馈到反相端，而从负载端将反馈接到放大器/驱动器的反相端的一种连接方法，其目的是减小线路电阻引起的误差。如图1是ADI的AD688的datasheet中开尔文连接图。
图1
原文介绍如下（翻译仅供参考）：
KELVIN CONNECTIONS
Force and n connections, also referred to as Kelvin connections, offer a convenient method of eliminating the effects of voltage drops in circuit wires. As en in Figure 9a, the load current and wire resistance produce an error (VERROR = R×IL) at the load. The
Kelvin connection of Figure 9b overcomes the problem by including the wire resistance within the forcing loop of the amplifier and nsing the load voltage. The amplifier corrects for any errors in the load voltage. In the circuit shown, the output of the amplifier would actually be at 10 volts + VERROR and the voltage at the load would be the desired 10 volts.
所说的开尔文连接是指驱动端和感测端的连接，它提供了抵消线路压降的便利方法。见图9.a，负载电流和线路电阻会使负载产生一个误差压降（VERROR = R×IL）。而如图9.b所示的开尔文连接会产生一个克服包括由放大器驱动环路的线路电阻在内的难题。（***nsing the load voltage暂时理不清它的意思指什么***） （放大器通过感测负载电压），放大器会纠正任何负载电压的误差。如图中所示，放大器的输出实际上是10V＋VERROR ，而负载得到的却是期望的10V。
The AD688 has three amplifiers which can be ud to implement Kelvin connections. Amplifier A2 is dedicated to the ground force-n function while uncommitted amplifiers A3 and A4 are free for other force-n chores.
AD688有3个可以用于开尔文连接的放大器。放大器A2专门用于the ground force-n 而无定制放大器A3和A4则可以做为其它“驱动-感测”事务之用。（****详见后面的图2，即原文件的图2.a）
In some applications, one amplifier may be unud. In such cas, the unud amplifier should be connected as a unity-gain follower (force and n pins tied together) and the input should be connected to ground.
（这两个无定制放大器）在某些应用中，有一个可能不会用到。同样的原因，不用的放大器应当成单位增益跟随器（驱动端和感测端接到一起），且其输入端应接地。
