*4.33 As an alternative to the idea suggested in Prob- lem 4.32, the designer considers a second approach to produc- ing a relatively constant small voltage from a variable current supply: It relies on the ability to make quite accurate copies of any small current that is available (using a process called current mirroring). The designer proposes to use this idea to supply two diodes of different junction areas with equal cur- rents and to measure their junction-voltage difference. Two types of diodes are available: for a forward voltage of 700 mV, one conducts 0.1 mA, while the other conducts 1 A. Now, for identical currents in the range of 1 mA to 3 mA supplied to each, what range of difference voltages result? What is the effect of a temperature change of±20°Con this arrangement?

*4.33 As an alternative to the idea suggested in Prob- lem 4.32, the designer considers a second approach to produc- ing a relatively constant small voltage from a variable current supply: It relies on the ability to make quite accurate copies of any small current that is available (using a process called current mirroring). The…

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