Problem:
In an electronic instrument using the biasing scheme shown in Figure, a manufacturing error reduces RS to zero. Let VDD = 15 V, RG1 =10 MΩ , and RG2 =5.1MΩ . What is the value of VG created? If supplier specifications allow kn to vary from 0.2 to 0.3 mA/V2 and Vt to vary from 1.0 V to 1.5 V, what are the extreme values of ID that may result? What value of RS should have been installed to limit the maximum value of ID to 1.5 mA? Choose an appropriate standard 5% resistor value (refer to Appendix J). What extreme values of current now result?