Masnari/Escuti/Brickley 3. Assuming that the turn-on voltage for the diodes in the circuits shown below is 0.7 V: a.Determine if the diode is ‘on’ in each circuit. b.Find the currents I1, I2and IDin each circuit. c.Find the voltage at node X in each circuit. Circuit 2 Solution with proper turn-on voltage VV7.0=γ. (a)Assuming that the diode is ‘on’, the KVL and KCL equations become: (1) 03)1()3(5:21=+Ω−Ω−VIKIKVKVLloopouter(2) 03)1(7.0)2(:2=+Ω−−ΩVIKVIKKVLDlooprightRewriting KVL equations (1) and (2) we have (1) VIKIK8)1()3(21=Ω+Ω(2) VIKIKD3.2)2()1(2=Ω−Ωalong with the KCL equation for node X (3)0:21=−−DXnodeIIIKCLSolving these three equations for the respective branch currents we get:
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