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Photodiode Étienne
These photodiodes were developed by Étienne in cooperation with the AEI and altered to peak at about 16.2MHz.
Schematics Used
Notable Changes Made
To achieve a peak at around 16.2MHz, components had to be changed.
Changed components:
Schematic Component | Used Component | |
---|---|---|
L1 | 6u8 | 6u8 |
C3 | 6p | 2 x 4.7p |
R2 | 40.2R | 40.2R |
Changed only for the 3rd and 4th build | ||
U5 | AD587 | LT1236A-10 |
C19 | 1u | none |
- For Coil L1 the part 1812CS-682XJLC (or at least a part with the same form factor) has to be used
- C3 influences at which frequency the peak will be
- Instead of the AD587, LT1236A-10 can be used
- When doing this, the C19 component must not be soldered.
- C19 connects pin 8 of U5 to ground. Pin 8 is not in use in LT1236A-10.
Using The Photodiode
- The photodiode requires a power input of +/- 15V
- AC Output: right SMA connector
- DC Output: left SMA connector
- When using a spectrum-analyzer (e.g. RIGOL DSA815) in combination with the ROHDE&SCHWARZ signal-generator, a 50Ω terminator must be used, too
Measured Data
The traces of the amplitude and phase were measured.
The results:
Diode | Resonance frequency [MHz] | Peak to 15MHz Ratio [dB] | P14R [dB] | P17R [dB] | P18R [dB] | FWHM with Gauß-Fit [kHz] | Phase #1 | Comment |
---|---|---|---|---|---|---|---|---|
1 | 16.11 [+/- 0.015] | 8.65 | 13.71 | 6.99 | 12.44 | 271.75 | ||
2 | 16.14 [+/- 0.01] | 8.92 | 13.46 | 6.53 | 11.34 | 270.98 | ||
3 | 16.13 [+/- 0.01] | 9.17 | 14.75 | 6.66 | 12.13 | 271.45 | ||
4 | 16.16 [+/- 0.01] | 9.39 | 14.81 | 6.5 | 12.09 | 269.72 |
#1 <color #ff00ff>Was bedeutet P17 etc?</fc> #2 <color #00ff00>Peak to 17MHz Ratio [Name sollte besser noch geändert werden]</fc>
- X = MAx dazu Y Wert = Peak hight over ..
- <color #ff0000>Es feht der Fehler von der Linienbreite und des Max Peaks</fc>
- Höhe des Resonanz-Peaks über Rauschen