This generator provides a pure sine signal with very little drift and phase noise. It sacrifices flexibility for stability, compactness and simplicity.
The resistors and inductors of the filter have to be adapted to the specific operation frequency. Refer to table 1 for values known to work. The filter design tool hosted at the university of York, UK is recommended to determine reasonable values from scratch.
|16.9 MHz||50 Ω||1.5μH||150 pF||2.2 μH||100 pF||300 Ω||chebychev|
A generator configured for 20.00 MHz was characterized:
About ten devices are in use at Mg.
An integrates quartz oscillator provides a stable square wave signal. A passive four pole LC filter removes the higher harmonics to render a near perfect sine waveform. An amplifier is used on output to increase the amplitude and the ability to drive low impedance loads.
Mounting holes of the generator and connectors are compatible with the design of the photodiode amplifier PD-ac-dc.
The oscillator should oscillate right out of the box.
|4-layer PCB||1x||24.50 €||€||1/4 of 95.43 EUR (Basista-Prototyping)|
|enclosing||1x||8.20 €||€||Hammond 1590LLBBK|
|SMA connector||1x||1.60 €||€|
|JAE IL-G connector, 3 pin||1x||0.30 €||€|
|voltage regulator||2x||0.20 €||€||SOT89|
|100 µH inductor||2x||0.30 €||€|
|10 µF tantalum cap||3x||0.80 €||€|
|HF inductor||2x||0.50 €||€||Epcos B82498F|
|oscillator||1x||2.30 €||€||Auris AQO-7050|
|opamp AD817||1x||6.55 €||€||fast, high slew rate|
|resistors, caps, diodes||25x||0.02 €||€||all parts sized 0805|
When produced as a mini series of 60, the price for the PCB drops to 5.20 € per piece.
(Icons: : nope, : in the works, : done in the schematic, not yet in layout, : done)