Test of a single max477 opamp in a gain of -2 circuit * .WIDTH IN=78 OUT=80 * * * * SubCircuit for the max477 opamp * * MAX477 FAMILY MACROMODELS * ------------------------- * * FEATURES: * 300MHz Unity-Gain Bandwidth * 200MHz Full-Power Bandwidth * 8mA Typical Supply Current * 100mA Output Drive * 1100V/uS Slew Rate * * connections: non-inverting input * | inverting input * | | positive power supply * | | | negative power supply * | | | | output * | | | | | * | | | | | .SUBCKT MAX477 201 1 99 50 40 * ISUPP 99 0 5.5MA ISUPPN 50 0 -5.5MA * *** INPUT STAGE I101 99 205 430U I202 204 50 430U Q201 50 203 205 QPN Q202 99 203 204 QNN R201 205 206 633 * C201 206 99 .3p * was .63 R202 204 207 633 * C202 207 50 .3P * was .63 R203 99 208 633 V201 99 210 .3 RE201 210 230 130 D201 230 208 DX R204 50 209 633 V202 211 50 .3 RE202 211 231 150 D202 209 231 DX Q203 208 206 202 QNI Q204 209 207 202 QPI R206 201 99 20meg R207 201 50 20meg IB201 201 99 2UA IB202 99 202 2UA VOS200 203 201 0V * CIN201 201 0 1.5P * CIN202 202 0 1.5P * RGM 2 220 380 VGM 202 220 0V * *** VGM SENSES THE CURRENT THROUGH VGM *** INPUT STAGE I1 99 5 430U I2 4 50 430U Q1 50 3 5 QPN Q2 99 3 4 QNN R1 5 6 633 * C1 6 99 .3P * was .63 R2 4 7 633 * C2 7 50 .3P * was .63 R3 99 8 633 V1 99 10 .3 RE1 10 30 130 D1 30 8 DX R4 50 9 633 V2 11 50 .3 RE2 11 31 150 D2 9 31 DX Q3 8 6 2 QNI Q4 9 7 2 QPI R6 1 99 20meg R7 1 50 20meg IB1 1 99 2UA IB2 99 2 2UA VOS 3 1 0V * **************SECOND STAGE************** * ********************Isup 99 50 4.47M R8 99 49 1meg R9 49 50 1meg V3 99 16 1.755 *pos swig D3 15 16 DX D4 17 15 DX V4 17 50 1.755 *neg swing EH 99 98 99 49 1 *G1 98 15 POLY(2) 99 2 50 202 0 1.58E-3 1.58E-3 F1 98 15 VGM .35 R5 98 15 2.372MEG *** *********************** 1st pole here with r5, and c3 C3 98 15 .376P *was .29p * ***************POLE STAGE*************** * *Fp=250MHz G2 98 20 15 49 1E-3 R14 98 20 1K *C4 98 20 .692P *C4 98 20 .5P * ***************POLE STAGE*************** * *Fp=500 MHz G3 98 21 20 49 1E-3 R15 98 21 1K *C5 98 21 .03P * ***************POLE STAGE*************** * *Fp=250 MHz G4 98 22 21 49 1E-3 R16 98 22 1K *C6 98 22 .346P * ***************POLE STAGE*************** * *Fp=250 MHz G5 98 23 22 49 1E-3 R17 98 23 1K *C7 98 23 .246P * **************OUTPUT STAGE************** * F6 99 50 VA7 1 F5 99 35 VA8 1 D7 36 35 DX VA7 99 36 0 D8 35 99 DX E1 99 37 99 23 1 VA8 37 38 0 R35 38 40 10 L35 38 40 300U *r35 was 12 V5 33 40 .8V D5 23 33 DX V6 40 34 .8V D6 34 23 DX *CF1 40 2 5P *** was 2.1pf * ***************MODELS USED************** * .MODEL QNI NPN(IS=1E-14 BF=10E4 VAF=15 KF=6.7E-14) .MODEL QPI PNP(IS=1E-14 BF=10E4 VAF=15 KF=6.7E-14) .MODEL QNN NPN(IS=1E-14 BF=10E4 VAF=15 KF=4.13E-13) .MODEL QPN PNP(IS=1E-14 BF=10E4 VAF=15 KF=4.13E-13) .MODEL DX D(IS=1E-15) .MODEL DY D(IS=1E-17) .MODEL DN D(KF=1.667E-9 AF=1 XTI=0 EG=.3) * .ENDS MAX477 * * * Now define the surrounding gain of -2 configuration * * VCC Power Supply * VCC 599 0 DC 5V * * VEE Power Supply * VEE 595 0 DC -5V * * * Sweep the input voltage from 1 kHz to 50 MHz in 10 steps per decade. * .AC DEC 10 1kHz 50MEGHZ * * * Voltage Source 50 Ohms * VIN 501 0 AC 0.01 **RS1 501 502 50 RS1 501 502 0.001 * * * Input Resistor 300 Ohms * RIN 502 505 3.00 * * * Feedback Resistor 600 Ohms * RFB 510 505 6.00 * * * Output Load Resistor 200 Ohm * RP1 510 0 200 * * * Instance the max477 * X1 0 505 599 595 510 MAX477 * * .PRINT AC VM(510,0) VP(510,0) .PLOT AC VM(510,0) VP(510,0) * .END .END *