ADCIN_FULLY_DIFF1.CIR - FULLY DIFFERENTIAL AMPLIFIER ADC DRIVER * * DIFFERENTIAL SOURCE VPOS 11 10 SIN(0V +2VPEAK 1KHZ) VNEG 12 10 SIN(0V -2VPEAK 1KHZ) * * COMMON MODE VOLTAGE VCM 10 0 DC 0V *VCM 10 0 SIN(0V 1VPEAK 10KHZ) * VREF 5 0 DC 0V * R1 12 2 10K R2 2 3 10K R3 11 1 10K R4 1 4 10K XOP1 1 2 3 4 5 FULLYDIFF1 * * * FULLY DIFF AMP MODEL ******************************** * vip vin vop von vcm_set .SUBCKT FULLYDIFF1 1 2 3 4 5 * INPUT IMPEDANCE RIN 1 2 10MEG * OUTPUT VOLTAGES EOUTP 3 7 VALUE = { V(1,2) * +100000/2 } EOUTN 4 7 VALUE = { V(1,2) * -100000/2 } * COMMON-MODE OUTPUT - SERVO AMP ECM 7 0 5 6 1e6 RCM1 3 6 1MEG RCM2 4 6 1MEG RCMOUT 7 0 1MEG RCMIN 5 0 1MEG * .ENDS ******************************************************** * * ANALYSIS .TRAN 0.01MS 2MS * .PROBE .END