diff options
Diffstat (limited to 'src/lib/netlist/examples/norton_opamp.c')
-rw-r--r-- | src/lib/netlist/examples/norton_opamp.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/src/lib/netlist/examples/norton_opamp.c b/src/lib/netlist/examples/norton_opamp.c new file mode 100644 index 00000000000..cf9c55622b2 --- /dev/null +++ b/src/lib/netlist/examples/norton_opamp.c @@ -0,0 +1,129 @@ +/* + * opamp.c + * + */ + + +#include "netlist/devices/net_lib.h" + +NETLIST_START(main) +{ + + /* Standard stuff */ + + CLOCK(clk, 10000) // 1000 Hz + SOLVER(Solver, 48000) + ANALOG_INPUT(V5, 5) + PARAM(Solver.ACCURACY, 1e-6) + PARAM(Solver.DYNAMIC_TS, 0) + PARAM(Solver.SOR_FACTOR, 1.0) + //PARAM(Solver.CONVERG, 1.0) + PARAM(Solver.GS_LOOPS, 5) + + SUBMODEL(op1, opamp_fast) + /* Wired as non - inverting amplifier like in LM3900 datasheet */ + + RES(R1, 25000) + RES(R2, 100000) + RES(R3, 200000) + CAP(C1, CAP_U(0.05)) + + NET_C(clk, C1.1) + NET_C(C1.2, R1.1) + + NET_C(op1.VM, GND) + NET_C(op1.VP, V5 ) + NET_C(op1.PLUS, R1.2, R3.1) + NET_C(R3.2, V5) + //NET_C(R3.2, GND) + NET_C(op1.MINUS, R2.2) + NET_C(op1.OUT, R2.1) + + RES(RL, 10000) + NET_C(RL.2, GND) + NET_C(RL.1, op1.OUT) + + LOG(logX, op1.OUT) + LOG(logY, clk) +} + +NETLIST_START(opamp) +{ + + /* Opamp model from + * + * http://www.ecircuitcenter.com/Circuits/opmodel1/opmodel1.htm + * + * Bandwidth 10Mhz + * + */ + + /* Terminal definitions for calling netlists */ + + ALIAS(PLUS, G1.IP) // Positive input + ALIAS(MINUS, G2.IN) // Negative input + ALIAS(OUT, EBUF.OP) // Opamp output ... + ALIAS(VM, EBUF.ON) // V- terminal + ALIAS(VP, DUMMY.I) // V+ terminal + + DUMMY_INPUT(DUMMY) + + /* The opamp model */ + + CCCS(G1) + CCCS(G2) + //PARAM(G1.G, 100) // typical OP-AMP amplification 100 * 1000 = 100000 + PARAM(G1.G, 1000000) // typical OP-AMP amplification 100 * 1000 = 100000 + PARAM(G2.G, 1000000) // typical OP-AMP amplification 100 * 1000 = 100000 + RES(RP1, 1000) + CAP(CP1, 1.59e-6) // <== change to 1.59e-3 for 10Khz bandwidth + VCVS(EBUF) + PARAM(EBUF.RO, 50) + PARAM(EBUF.G, 1) + +// NET_C(EBUF.ON, GND) + + NET_C(G1.ON, GND) + NET_C(G2.ON, GND) + NET_C(RP1.2, GND) + NET_C(CP1.2, GND) + NET_C(EBUF.IN, GND) + + NET_C(G1.IN, G2.IP, GND) + + NET_C(RP1.1, G1.OP) + NET_C(RP1.1, G2.OP) + NET_C(CP1.1, RP1.1) + NET_C(EBUF.IP, RP1.1) + +} + +NETLIST_START(opamp_fast) +{ + + /* + * Fast norton opamp model without bandwidth + */ + + /* Terminal definitions for calling netlists */ + + ALIAS(PLUS, R1.1) // Positive input + ALIAS(MINUS, R2.1) // Negative input + ALIAS(OUT, G1.OP) // Opamp output ... + ALIAS(VM, G1.ON) // V- terminal + ALIAS(VP, DUMMY.I) // V+ terminal + + DUMMY_INPUT(DUMMY) + + /* The opamp model */ + + RES(R1, 1) + RES(R2, 1) + NET_C(R1.1, G1.IP) + NET_C(R2.1, G1.IN) + NET_C(R1.2, R2.2, G1.ON) + VCVS(G1) + PARAM(G1.G, 1000000) + PARAM(G1.RO, RES_K(8)) + +} |