mirror of
https://github.com/mamedev/mame.git
synced 2024-11-16 07:48:32 +01:00
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
/*
|
|
* opamp.c
|
|
*
|
|
*/
|
|
|
|
|
|
#include "netlist/devices/net_lib.h"
|
|
|
|
NETLIST_START(opamp)
|
|
|
|
/* Opamp model from
|
|
*
|
|
* http://www.ecircuitcenter.com/Circuits/opmodel1/opmodel1.htm
|
|
*
|
|
* Bandwidth 10Mhz
|
|
*
|
|
* This one is connected as a impedance changer
|
|
*/
|
|
|
|
/* Standard stuff */
|
|
|
|
CLOCK(clk)
|
|
PARAM(clk.FREQ, 1000) // 1000 Hz
|
|
SOLVER(Solver)
|
|
PARAM(Solver.FREQ, 48000)
|
|
PARAM(Solver.ACCURACY, 1e-6)
|
|
|
|
/* Wiring up the opamp */
|
|
|
|
NET_C(PLUS, clk)
|
|
NET_C(MINUS, OUT)
|
|
|
|
/* The opamp model */
|
|
|
|
NETDEV_VCCS(G1)
|
|
PARAM(G1.G, 100) // typical OP-AMP amplification 100 * 1000 = 100000
|
|
RES(RP1, 1000)
|
|
CAP(CP1, 1.59e-6) // <== change to 1.59e-3 for 10Khz bandwidth
|
|
NETDEV_VCVS(EBUF)
|
|
PARAM(EBUF.RO, 50)
|
|
PARAM(EBUF.G, 1)
|
|
|
|
NET_ALIAS(PLUS, G1.IP) // Positive input
|
|
NET_ALIAS(MINUS, G1.IN) // Negative input
|
|
NET_ALIAS(OUT, EBUF.OP) // Opamp output ...
|
|
|
|
NET_C(EBUF.ON, GND)
|
|
|
|
NET_C(G1.ON, GND)
|
|
NET_C(RP1.2, GND)
|
|
NET_C(CP1.2, GND)
|
|
NET_C(EBUF.IN, GND)
|
|
|
|
NET_C(RP1.1, G1.OP)
|
|
NET_C(CP1.1, RP1.1)
|
|
NET_C(EBUF.IP, RP1.1)
|
|
|
|
//LOG(logX, OUT)
|
|
//LOG(logY, 4V)
|
|
NETLIST_END()
|