Sorry I have to re-post this project, as the logic of this site does not seem to allow a freelancer to lower her bid after the bidding deadline - even if this is due to project clarification and has been communicated in PM's. So here we go again...
We need a custom schematic design ready for layout, which can implement an RMS level to DC level converter for detecting a signal amplitude with an A/D converter.
Input frequency: 1 Hz to 500 MHz
Input range: -90 dBm to +10 dBm
Accuracy: 0.1 dBm
Board size: max 100 mm by 50 mm
Power source: USB
The device is a simple analog in, analog out detector for measuring RMS value of a small signal in the frequency range 1 Hz to 500 MHz. With the input signal applied at the input, the output should be a DC voltage in the range of 0V to about 3V for feeding into a suitable A/D converter. The A/D converter is not part of the detector, but suitable types may be suggested.
A more detailed requirement document is attached.
USB power is optional - if you can make it work on USB power, you have a much better solution. But feel free to suggest a solution that requires maybe [url removed, login to view] DC plus less than some number of mV AC ripple up to some frequency if you want. I will consider that as well.
For accuracy or linearity, the important thing is really being able measure the whole range of -90dBm to +10dBm with a resolution of [url removed, login to view] both in terms of absolute and relative accuracy.
This may require calibration - preferably build in and automatic. And it may require a table/function to translate from the output voltage to the measured input level. That is perfectly okay and the table/function would then be implemented outside of this project on a PC.
You acknowledge and agree that all works of authorship included in this project, shall be considered "WORKS MADE FOR HIRE" and that all ownership in such works shall vest entirely to me.
You agree to assign and deliver to me the entire rights, designs, related documentation, title and interest in this project and all copyrights.
Four steps are defined for this project:
1) Schematic ready for layout
3) Functional prototype
4) Verification test
Please bid for the first step only along with individual estimates (time and money) for the remaining 3 steps.