Help with AD630 in Pspice

A

Archer

Guest
I was using AD630 in a Lock-in Amplifier Design and Simulation. But it
seems so difficult to simulate the circuit,the pin
2(CHA+),18(CHB+),7(STAT),12(COMP) needs not to be connected.If I leave
them alone,the pspice will report that
"ERROR [NET0075] Unconnected pin, no FLOAT property or FLOAT = e U1
pin 'CHA+'
ERROR [NET0075] Unconnected pin, no FLOAT property or FLOAT = e U1
pin 'CHB-'
ERROR [NET0075] Unconnected pin, no FLOAT property or FLOAT = e U1
pin 'COMP'
ERROR [NET0075] Unconnected pin, no FLOAT property or FLOAT = e U1
pin 'STAT'
"

what can i do?

i tried to connect the Pin2 and Pin 18 directly,and Pin 7 to GND with
resistor,and Pin12 directly to Pin13.

it is reported that:


ERROR -- Convergence problem in transient analysis at Time =
53.75E-06
Time step = 9.592E-15, minimum allowable step size =
12.00E-15

These voltages failed to converge:

V(X_U1.22) = -447.86uV \ -445.57uV

These supply currents failed to converge:

I(X_U1.ECMA) = 298.52uA \ 296.21uA
I(X_U1.ECMB) = -29.57uA \ -31.88uA
I(X_U2A.ve) = 1.979uA \ 1.661uA


What would I do to solve this terrible problem?
 
Here is the schematic.
http://xydarcher.51.net/AD630scheme.GIF
On Fri, 21 May 2004 20:29:23 +0800, Archer <xydarcher@hotmail.com>
wrote:

I was using AD630 in a Lock-in Amplifier Design and Simulation. But it
seems so difficult to simulate the circuit,the pin
2(CHA+),18(CHB+),7(STAT),12(COMP) needs not to be connected.If I leave
them alone,the pspice will report that
"ERROR [NET0075] Unconnected pin, no FLOAT property or FLOAT = e U1
pin 'CHA+'
ERROR [NET0075] Unconnected pin, no FLOAT property or FLOAT = e U1
pin 'CHB-'
ERROR [NET0075] Unconnected pin, no FLOAT property or FLOAT = e U1
pin 'COMP'
ERROR [NET0075] Unconnected pin, no FLOAT property or FLOAT = e U1
pin 'STAT'
"

what can i do?

i tried to connect the Pin2 and Pin 18 directly,and Pin 7 to GND with
resistor,and Pin12 directly to Pin13.

it is reported that:


ERROR -- Convergence problem in transient analysis at Time =
53.75E-06
Time step = 9.592E-15, minimum allowable step size =
12.00E-15

These voltages failed to converge:

V(X_U1.22) = -447.86uV \ -445.57uV

These supply currents failed to converge:

I(X_U1.ECMA) = 298.52uA \ 296.21uA
I(X_U1.ECMB) = -29.57uA \ -31.88uA
I(X_U2A.ve) = 1.979uA \ 1.661uA


What would I do to solve this terrible problem?
Click to expand...
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top