* MACRO AMP         
*****************************************************
*
*  CALCULATED PARAMETERS
*
*  GIVEN VALUES
PT 300
PF 10
PNWBSC #10N#
PNFSC  #700N#
*  CONSTANTS
PK 1.3806E-23
PQ 1.6022E-19
*  CALCULATED VALUES
PVT   #PK*PT/PQ#
PIDSC #2*PVT*PVT*PQ/(PNWBSC*PNWBSC)#
PKFSC #(PNFSC*PNFSC-PNWBSC*PNWBSC)*PIDSC*PF/(PVT*PVT)#
*
*  SWITCHED CAPACITOR OPAMP MODEL
.SUBCKT OPSC   1    2    6     7      9    NBW=20 
* PIN DESC--  IN-  IN+  OUTC  OUTR+  OUTR-       
IOUT   1 3      0
EOUT1  6 0 3 1  10000
EOUT2  8 0 1 3  10000
ENOP   3 2 4 0  1
ENA1   6 7 5 0  1
ENA2   8 9 5 0  1
************** NOISE MODEL USING A DIODE ************
.MODEL DIODESC D KF=#PKFSC# AF=1 CJO=1F RS=1U TNOM=27
IFORCE 0 11 DC #PIDSC#
D1  11 0 DIODESC
ED1 12 0 11 0  1
CD1 12 4  1MF
HD1  4 14 VD1  1MEG
VD1 14 0  DC 0  AC 0
*****************************************************
RA1  5 0  #PNWBSC*PNWBSC*(NBW-1)/(2*PK*PT)#
RA2  5 0  #PNWBSC*PNWBSC*(NBW-1)/(2*PK*PT)#
RL1  6 0  1
RL2  7 0  1
RL3  9 0  1
.ENDS OPSC
*****************************************************