Timeline for Sinusoidal waveform generator from DC
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 4, 2019 at 4:43 | vote | accept | muyustan | ||
| Nov 28, 2019 at 7:38 | comment | added | LvW | I did not mention 1Mohm.....the goal is that RP||RF reaches the required value (for a gain of 3) for an output amplitude of some volts. You may start perhaps with RP=10*RF. | |
| Nov 27, 2019 at 20:26 | comment | added | muyustan | @LvW so you mean a diode + 1Mohm resistor in series for which value of the potential between two ends(res+diode) the diode starts to allow the current? Because for me, the answer is idealy above 0.7 volts it starts to act as short. | |
| Nov 27, 2019 at 19:34 | comment | added | LvW | Buth this does not mean that the voltage across the diodes is also 0,7volts....don`t forget the relatively large resistor RP in series to the diodes... | |
| Nov 27, 2019 at 18:26 | comment | added | muyustan | @LvW I have heard and seen that method too while researching, however one part I cannot understand about this solution, why those diodes be close at any time? The voltage on the RF looks like to be higher than 0.7V for almost all the times. | |
| Nov 27, 2019 at 18:20 | comment | added | LvW | The most simple method is to make the feedback resistor RF of the gain stage somewhat larger than calculated (gain >3) and to place a series combination of another large resistor RP and two antiparallel diodes in parallel to RF. A rising amplitude will open the diodes an makes RF||RP and will the gain bring back to "3". | |
| Nov 27, 2019 at 10:26 | comment | added | muyustan | @LvW thanks, any recommendations on amplitude stability without too much effort and resources? | |
| Nov 27, 2019 at 8:11 | comment | added | LvW | It is - more or less - "normal" without any additional means for amplitude control. If you can live with it - OK. Otherwise, you must use some non-linear elements (diodes for example) which can perform "soft limiting" (instead of hard-limiting resp. clipping caused by the power rail). | |
| Nov 26, 2019 at 18:52 | comment | added | muyustan | Actually i tried some circuits and most top and bottom parts of the sine waves were little bit clipped like 0.2 V. So that should be considered normal? | |
| Nov 26, 2019 at 18:42 | comment | added | LvW | You are speaking of "sinusoidal signals"....be aware that this is an ideal case, Each oscillator output ("called "sinusoidal") will exhibit non-linear distortions, which strongly depend on the amplitude control mechanism within the oscillator. Hence, it is important if you have any signal quality requirements? | |
| Nov 26, 2019 at 12:29 | history | edited | Mitu Raj | CC BY-SA 4.0 |
added 4 characters in body
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| Nov 26, 2019 at 11:20 | answer | added | Criticizing Israel not allowed | timeline score: 4 | |
| Nov 26, 2019 at 9:59 | history | asked | muyustan | CC BY-SA 4.0 |