Category: Software
Software Version: 17.0.37.0
Hello,
I try to simulate this active full wave rectifier with LM358 (single supply) in LTspice.
As it is a single supply, Vref is at half VCC, but the output voltage Vref is in the kV range.
This is the output of the rectifier, before the summing amplifier. The rectification seems to work, but not at the correct Vref voltage. Any ideas why ?
Attached, the .asc file, and the LM358 model I use (from TI)
Active_full_wave_rectifier.asc
* WARNING : please consider following remarks before usage * * 1) All models are a tradeoff between accuracy and complexity (ie. simulation * time). * 2) Macromodels are not a substitute to breadboarding, they rather confirm the * validity of a design approach and help to select surrounding component values. * * 3) A macromodel emulates the NOMINAL performance of a TYPICAL device within * SPECIFIED OPERATING CONDITIONS (ie. temperature, supply voltage, etc.). * Thus the macromodel is often not as exhaustive as the datasheet, its goal * is to illustrate the main parameters of the product. * * 4) Data issued from macromodels used outside of its specified conditions * (Vcc, Temperature, etc) or even worse: outside of the device operating * conditions (Vcc, Vicm, etc) are not reliable in any way. * * ** Standard Linear Ics Macromodels, 1993. ** CONNECTIONS : * 1 INVERTING INPUT * 2 NON-INVERTING INPUT * 3 OUTPUT * 4 POSITIVE POWER SUPPLY * 5 NEGATIVE POWER SUPPLY .SUBCKT LM358 1 2 3 4 5 *************************** .MODEL MDTH D IS=1E-8 KF=3.104131E-15 CJO=10F * INPUT STAGE CIP 2 5 1.000000E-12 CIN 1 5 1.000000E-12 EIP 10 5 2 5 1 EIN 16 5 1 5 1 RIP 10 11 2.600000E+01 RIN 15 16 2.600000E+01 RIS 11 15 2.003862E+02 DIP 11 12 MDTH 400E-12 DIN 15 14 MDTH 400E-12 VOFP 12 13 DC 0 VOFN 13 14 DC 0 IPOL 13 5 1.000000E-05 CPS 11 15 3.783376E-09 DINN 17 13 MDTH 400E-12 VIN 17 5 0.000000e+00 DINR 15 18 MDTH 400E-12 VIP 4 18 2.000000E+00 FCP 4 5 VOFP 3.400000E+01 FCN 5 4 VOFN 3.400000E+01 FIBP 2 5 VOFN 2.000000E-03 FIBN 5 1 VOFP 2.000000E-03 * AMPLIFYING STAGE FIP 5 19 VOFP 3.600000E+02 FIN 5 19 VOFN 3.600000E+02 RG1 19 5 3.652997E+06 RG2 19 4 3.652997E+06 CC 19 5 6.000000E-09 DOPM 19 22 MDTH 400E-12 DONM 21 19 MDTH 400E-12 HOPM 22 28 VOUT 7.500000E+03 VIPM 28 4 1.500000E+02 HONM 21 27 VOUT 7.500000E+03 VINM 5 27 1.500000E+02 EOUT 26 23 19 5 1 VOUT 23 5 0 ROUT 26 3 20 COUT 3 5 1.000000E-12 DOP 19 25 MDTH 400E-12 VOP 4 25 2.242230E+00 DON 24 19 MDTH 400E-12 VON 24 5 7.922301E-01 .ENDS
