The sensitivity test of some ideal diode circuits

... using the transistor model of the LM324 ... apx. down to 10% error

 

---

[Eop]

Testing couple of rectifier circuits from datasheets

The following schematics are from LT1122 and LTC1047 d/s-s
while the first performs more than good -- then on a contrary i had to modify the 2-nd

↓Src::LT1122 datasheet -- not tested at various frequencies nor input amplitudes/wave-forms
 

↓Src::LTC1047 datasheet -- the 10kHz seems to be the limit for the outp integrity here

//// recently i noticed something while using a variant of the ideal diode circuit as shown in the "Low Voltage Op-Amps -- in-simulation TEST" -- so i am about to test through all "Absolute circuits" for their particular peculiarities . . .

↓Src::NE5535 datasheet

↓Src::http://nptel.ac.in/courses/117107094/17

↓Src::https://www.planetanalog.com/author.asp?section_id=3065&doc_id=562650 -- the circuit can do just at about 200kHz !? //// note :: i forgot to change the counter-weight 1N4148-s to 1N34-s below (their effect is not studied here , purpose = pending -- what seems obvious is not always that -- it must be verified whether there should be counter-balance for rectifying diodes or not . . .)

↓Src::https://forum.allaboutcircuits.com/threads/a-full-wave-precision-rectifier-query.9821/ --

↓Src::http://sound.whsites.net/appnotes/an001.htm -- it can go up to the limits defined by the frequency & slew of the Op Amp in use ((!? amazing circuit ?!))

↓Src::http://www.learningelectronics.net/worksheets/opamp8.html --the ® had a "bug" so i made random guesses . . . came out as good as previous ((at least what it seems so far ?)) /// edit : the R9 should be Rcp (although there seems no significant current to/from GND from/to U2.non-inverting_input) /// the input signal amplitude range is ±1.8V @ ±5V supply and ±10V @ ±15V supply -- simplified to a line equation y = ax + b where a = 1.219512195 , b = 2.804878049 , y = VsupTOT/2 , x= abs(±VmaxINP) referenced to the GND ( = Vsup "median" )

updates 'll follow ...

---

[Eop]

Single v. Double Op-Amp "Rectifier"

Intuitive design ::

Modified from the book ::

/̲!̲\̲ "Ideal DIODE" /̲!̲\̲ ::

 

e.g. below 24k ÷ 2 = 12k Hz (Dbl v.) OR 2k ÷ 2 = 1k Hz (Sng v.)

[Eop]