Comparison of various circuit diagram VI conversion and a constant current source

As shown, the circuit can get several constant current output to the load resistor RL. Since the first RL floating, rarely used. The second RL is a virtual ground, do not often

use. Although RL third floating, but a termination RL positive power supply terminal, more commonly used. The fourth is a positive feedback balanced, due to the load RL ground and loved by the people. The fifth and fourth on the same principle, but expanded the current output capacity, large multi-use people often take over the load resistor R2 RL, omitted follower amplifier. The fifth is a circuit I would like also to ground load, two are behind the constant current source circuit. Comparison of several V/I circuit, those who are not just one-way devices like transistors, can achieve constant exchange, after the addition of the transistor can only do a unidirectional DC current. The fourth and fifth are built on the basis of balanced positive and negative feedback, and if the error due to the resistance and loss of balance, will affect the constant current output characteristic, that is, the output current will vary with load. And several other resistance error affects only the value of the output current, without affecting the output characteristics, if the output current, or collector current and the emitter current of the transistor is not equal too, can be replaced by transistors MOSFET.

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