Timeline for "gain error" of rectifier circuit
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
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| Jan 2, 2018 at 14:56 | history | edited | Junius | CC BY-SA 3.0 |
corrected from "half wave" rectifier to rectifier
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| Dec 20, 2017 at 20:28 | comment | added | Eugene K | What changes in output waveform, except amplitude, are observed, when frequency is changes from 1kHz to 200kHz? Is output always proportional to |Vin| and only 'gain' is varied? Would you present pictures of input/output waveforms at both 1kHz Hz and 200kHz? Also, waveform at A1 output is of interest. | |
| Dec 20, 2017 at 15:55 | comment | added | Junius | @ Marko Buršič: It is not the opamp as in the appnote but I tried to chose one that is "compatible" @ Spehro Pefhany: Input and output signal are measured with a scope @ analogsystemsrf: Bypassing is there but due to breadboarding surely not the best. Still i don´t think this has to do with the "gain variations" @Eugene K: I actually ommitted the capacitance C1. Same as above, I think C1 is mainly for stability reasons and needs some tweaking, but in my opinion has no impact on "static" gain. | |
| Dec 19, 2017 at 0:17 | comment | added | Eugene K | BTW, why do you name it 'half wave rectifier', while it is full-wave one? | |
| Dec 18, 2017 at 23:25 | answer | added | Eugene K | timeline score: 2 | |
| Dec 18, 2017 at 20:53 | comment | added | Eugene K | What is C1 capacitance? | |
| Dec 18, 2017 at 17:08 | comment | added | analogsystemsrf | How clean (and free of resonances) are your rather low VDD voltage? You need dual 0.1uF to your designated GND node, the bottom of R3, the other ends to +2.5v and -2.5v. And your input cable (twisted pair) RTN should also attach to bottom of R3. | |
| Dec 18, 2017 at 16:55 | comment | added | Spehro 'speff' Pefhany | How are you measuring the input signal? | |
| Dec 18, 2017 at 16:54 | comment | added | AnalogKid | Is the gain flat from 100 Hz to 10 kHz? | |
| Dec 18, 2017 at 16:21 | comment | added | Marko Buršič | 1. The used amplifier is not from sboa068 app note list of opamps. 2. breadboard is not a tight PCB with small paths and guards to prevent stray capacitances. | |
| Dec 18, 2017 at 15:11 | history | asked | Junius | CC BY-SA 3.0 |