Current Sources and Voltage References

Using the JFET as a current source

Using JFETs and CRDs to Create Current Sources

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In summary, the lower the drain current and the lower the output conductance, then

the tighter the regulation will be. The closer the source resistor load-line intersects the

zero TC point, the less the current source will drift over the intended temperature

range, and the more stable and reliable your circuit will be. You can determine just how

accurate your current source is by applying equations 6.23 and 6.25.

As another design example, let’s create a simple JFET current source, in some easy

steps. We can use the following checklist (see Table 6.3) to aid in our ...