Diode-Resistor circuit r1 2 0 1k d1 1 2 diode vcc 1 3 5v ac 0.001 sin(5 0.01 1000) distof1 0.01 distof2 0.01 vcc2 3 0 0v *.model diode D .model diode D is=1.0e-14 tt=0.1n cjo=2p *.disto dec 1 1000.0 1000.0 *.disto dec 20 1.0e3 1.0e8 .disto dec 20 1.0e3 1.0e8 0.9 *the output is v(2) .end