Precision Current Source Design Employs Bootstrapped Integrator

摘要

The general-purpose current source in Figure 1 is accurate within 1% and insensitive to temperature (less than 50 ppm/℃). It also has a high output resistance and a wide compliance range (4.3 to 34 V). This composite configuration uses an IC voltage reference (IC1) and resistor (R1) to create a current source that follows the expression I_(SOUBCE) = V_(REF)/R1 + IC1's ground current.