006_op-amp_bandwidth : OP AMP Bandwidth
Requires: SmartSpice & Smartview
Minimum Versions: SMARTSPICE 4.6.5.R
The input deck for an Operational Amplifier circuit with mixed analysis of .AC, .TRAN and .MEASURE. Rubberband ".param DCGAIN to see effect on output bandwidth response.
- AC (.AC statement)
- transient (.TRAN statement)
- MEASURE (.MEASURE statement)
Input Files
rubberband_example_06.in
* OPAMP Bandwidth * Rubberband parameters: * .PARAM DCGAIN .PARAM DCGAIN=100k VS 1 0 AC 1V PWL(0US 0V 0.01US 1V 100US 1V) * * NON-INVERTING AMPLIFIER R1 2 0 10K R2 2 4 10K XOP1 1 2 4 OPAMP1 * * INVERTING AMPLIFIER R_1 1 12 10K R_2 12 14 10K XOP2 0 12 14 OPAMP1 * * * OPAMP MACRO MODEL, SINGLE-POLE * connections: non-inverting input * | inverting input * | | output * | | | .SUBCKT OPAMP1 1 2 6 * INPUT IMPEDANCE RIN 1 2 10MEG * DCGAIN =100K AND POLE1=1/(2*PI*RP1*CP1)=100HZ * GBP = DCGAIN X POLE1 = 10MHZ EGAIN 3 0 1 2 DCGAIN RP1 3 4 1000 CP1 4 0 1.5915UF * OUTPUT BUFFER AND RESISTANCE EBUFFER 5 0 4 0 1 ROUT 5 6 10 .ENDS * * * ANALYSIS .AC DEC 5 10 100MEG .TRAN 0.01US 0.5US .param point0='0.707*2' .measure ac crosscutoff cross v(4) val='point0' .param point1=0.2 point2=1.6 .measure ac slope1 cross v(4) val='point1' .measure ac slope2 cross v(4) val='point2' .measure ac slope3 expr val='abs((point2-point1)/(slope1-slope2))' .save tran v(4) v(14) .save ac v(4) v(14) .end
Graphics
