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127 lines
2.6 KiB
C
127 lines
2.6 KiB
C
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/*
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* opamp.c
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*
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*/
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#include "netlist/devices/net_lib.h"
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NETLIST_START(main)
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/* Standard stuff */
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CLOCK(clk, 10000) // 1000 Hz
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SOLVER(Solver, 48000)
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ANALOG_INPUT(V5, 5)
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PARAM(Solver.ACCURACY, 1e-6)
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PARAM(Solver.DYNAMIC_TS, 0)
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PARAM(Solver.SOR_FACTOR, 1.0)
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//PARAM(Solver.CONVERG, 1.0)
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PARAM(Solver.GS_LOOPS, 5)
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SUBMODEL(op1, opamp_fast)
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/* Wired as non - inverting amplifier like in LM3900 datasheet */
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RES(R1, 25000)
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RES(R2, 100000)
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RES(R3, 200000)
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CAP(C1, CAP_U(0.05))
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NET_C(clk, C1.1)
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NET_C(C1.2, R1.1)
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NET_C(op1.VM, GND)
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NET_C(op1.VP, V5 )
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NET_C(op1.PLUS, R1.2, R3.1)
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NET_C(R3.2, V5)
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//NET_C(R3.2, GND)
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NET_C(op1.MINUS, R2.2)
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NET_C(op1.OUT, R2.1)
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RES(RL, 10000)
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NET_C(RL.2, GND)
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NET_C(RL.1, op1.OUT)
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LOG(logX, op1.OUT)
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LOG(logY, clk)
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NETLIST_END()
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NETLIST_START(opamp)
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/* Opamp model from
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*
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* http://www.ecircuitcenter.com/Circuits/opmodel1/opmodel1.htm
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*
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* Bandwidth 10Mhz
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*
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*/
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/* Terminal definitions for calling netlists */
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ALIAS(PLUS, G1.IP) // Positive input
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ALIAS(MINUS, G2.IN) // Negative input
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ALIAS(OUT, EBUF.OP) // Opamp output ...
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ALIAS(VM, EBUF.ON) // V- terminal
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ALIAS(VP, DUMMY.I) // V+ terminal
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DUMMY_INPUT(DUMMY)
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/* The opamp model */
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CCCS(G1)
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CCCS(G2)
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//PARAM(G1.G, 100) // typical OP-AMP amplification 100 * 1000 = 100000
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PARAM(G1.G, 1000000) // typical OP-AMP amplification 100 * 1000 = 100000
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PARAM(G2.G, 1000000) // typical OP-AMP amplification 100 * 1000 = 100000
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RES(RP1, 1000)
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CAP(CP1, 1.59e-6) // <== change to 1.59e-3 for 10Khz bandwidth
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VCVS(EBUF)
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PARAM(EBUF.RO, 50)
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PARAM(EBUF.G, 1)
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// NET_C(EBUF.ON, GND)
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NET_C(G1.ON, GND)
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NET_C(G2.ON, GND)
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NET_C(RP1.2, GND)
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NET_C(CP1.2, GND)
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NET_C(EBUF.IN, GND)
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NET_C(G1.IN, G2.IP, GND)
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NET_C(RP1.1, G1.OP)
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NET_C(RP1.1, G2.OP)
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NET_C(CP1.1, RP1.1)
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NET_C(EBUF.IP, RP1.1)
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NETLIST_END()
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NETLIST_START(opamp_fast)
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/*
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* Fast norton opamp model without bandwidth
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*/
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/* Terminal definitions for calling netlists */
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ALIAS(PLUS, R1.1) // Positive input
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ALIAS(MINUS, R2.1) // Negative input
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ALIAS(OUT, G1.OP) // Opamp output ...
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ALIAS(VM, G1.ON) // V- terminal
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ALIAS(VP, DUMMY.I) // V+ terminal
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DUMMY_INPUT(DUMMY)
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/* The opamp model */
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RES(R1, 1)
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RES(R2, 1)
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NET_C(R1.1, G1.IP)
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NET_C(R2.1, G1.IN)
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NET_C(R1.2, R2.2, G1.ON)
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VCVS(G1)
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PARAM(G1.G, 1000000)
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PARAM(G1.RO, RES_K(8))
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NETLIST_END()
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