Part Number: OPA633
Tool/software: TINA-TI or Spice Models
I am looking for help running simulations of a design involving multiple OPA633 op amps. When I attempt to do so, I get a "floating node" error.
Important details:
1. I downloaded the Spice model from the TI website. Both the TINA and PSpice models cause the same error.
2. I generated the LT Spice model by creating a symbol from the .lib file.
3. The resulting model has 4 pins: VDD, VSS, IN, and OUT.
4. These pins are connected to the following signals: VDD/SS to +/- 5VDC, IN to an AC voltage source, OUT to the load.
The problem:
Simulating the OPA633 in LT Spice yields the following error:
Singular matrix: check node u8:7
Iteration No. 1
This circuit has floating nodes.
It then outputs the following error log:
Questionable use of curly braces in "b§gi10 98 45 i={if((v(z)/v(w))<(2.01/21),(v(xout)*v(yout))/(1.05*(1-(v(z)/v(w)))),((v(xout)*v(yout))/(1.05)))} "
Error: undefined symbol in: "if(([v](z)/v(w))<(2.01/21),(v(xout)*v(yout))/(1.05*(1-(v(z)/v(w)))),((v(xout)*v(yout))/(1.05)))"
WARNING: Node U2:11 is floating.
WARNING: Node U2:U12:2 is floating.
WARNING: Node U2:7 is floating.
WARNING: Node U2:U15:OUTX is floating.
WARNING: Node U8:11 is floating.
WARNING: Node U8:U12:2 is floating.
WARNING: Node U8:7 is floating.
WARNING: Node U8:U15:OUTX is floating.
WARNING: Less than two connections to node VDD. This node is used by V3.
Instance "m:u5:15": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:13": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:13": Width narrower than recommended for a level 1 MOSFET.
Instance "m:u5:11": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:10": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:14": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:12": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:9": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:7": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:6": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:5": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:4": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:3": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:2": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:8": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u5:1": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:15": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:13": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:13": Width narrower than recommended for a level 1 MOSFET.
Instance "m:u4:11": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:10": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:14": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:12": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:9": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:7": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:6": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:5": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:4": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:3": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:2": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:8": Length shorter than recommended for a level 1 MOSFET.
Instance "m:u4:1": Length shorter than recommended for a level 1 MOSFET.
Direct Newton iteration failed to find .op point. (Use ".option noopiter" to skip.)
Starting Gmin stepping
Gmin = 10
Gmin = 1.07374
Gmin = 0.115292
Gmin = 0.0123794
Gmin = 0.00132923
vernier = 0.5
vernier = 0.25
vernier = 0.125
vernier = 0.0625
Gmin = 0.00100083
vernier = 0.03125
vernier = 0.015625
vernier = 0.0078125
vernier = 0.00390625
vernier = 0.00195313
Gmin = 0.00100083
vernier = 0.000976563
vernier = 0.000488281
Gmin = 0
Gmin stepping failed
Starting source stepping with srcstepmethod=0
Singular matrix: Check node u2:u15:outx
Iteration No. 1
Singular matrix: Check node u8:7
Iteration No. 2
Could not converge to DC with sources off!
Starting source stepping with srcstepmethod=1
Singular matrix: Check node u8:7
Iteration No. 1
Could not converge to DC with sources off!
Singular matrix: Check node u8:7
Iteration No. 1
Fatal Error: Singular matrix: check node u8:7
Iteration No. 1
This circuit has floating nodes.
