OPREG.CIR - OPAMP VOLTAGE REGULATOR W/ SERIES-PASS TRANSISTOR * * INPUT VOLTAGE (VSIN FOR TEST ONLY) VIN 10 0 DC 15 VSIN 1 10 SIN(0 0 1KHZ) * SERIES TRANSISTOR Q1 1 3 2 QNOM * REFERENCE VOLTAGE RZ 1 4 5K DZ 0 4 D1N746 * OPAMP CONTROLLER XOP1 4 5 3 OPAMP1 RF2 2 5 10K RF1 5 0 5K * LOAD RL 2 0 100 *IL 2 0 PWL(0 0 10MS 0 10.1MS 1 20MS 1 20.1MS 0 30MS 0) * .model QNOM NPN(BF=100) .model D1N746 D(Is=5u Rs=14 Bv=2.81 Ibv=5u) * * OPAMP MACRO MODEL, SINGLE-POLE * connections: non-inverting input * | inverting input * | | output * | | | .SUBCKT OPAMP1 1 2 6 * INPUT IMPEDANCE RIN 1 2 10MEG * GAIN BANDWIDTH PRODUCT = 10MHZ * DC GAIN (100K) AND POLE 1 (100HZ) EGAIN 3 0 1 2 100K RP1 3 4 1K CP1 4 0 1.5915UF * OUTPUT BUFFER AND RESISTANCE EBUFFER 5 0 4 0 1 ROUT 5 6 10 .ENDS * * ANALYSIS .TRAN 0.05MS 30MS * VIEW RESULTS .PRINT TRAN V(2) .PLOT TRAN V(2) .PROBE .END