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Author Topic: help in designing high frequency controlled signal+amplifier+vrms  (Read 818 times)
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Hi

i'm more programmer, so I will be glade if you can help me
the design involve amplification of 10Mhz sinus and measure the vrms output for that

arduino digital --> signal generator module --> amplifier -->  RMS detector --> arduino  ADC
                                                                    ---------------------------------------------> ultrasound ceramic


1) signal generator module is AD9850 DDS signal generator module like this http://www.elecfreaks.com/2110.html
as I understand it is only frequency controlled and not amplitude controlled (if I wrong please tell me)
to control amplitude I tought using Digital Potentiometer like this one http://www.sparkfun.com/products/10613
is it going to work? any other thoughts?
how to connect it right?

2) amplifier is big box laying in our lab http://www.atecorp.com/Equipment/amplifierresearch/30s1g3m3.asp
the goal is to replace it to some thing small linear in the range 9-12 MHZ (more or less) with fix 20 gain (or controlled) giving
max output of 60 V p-p
any suggestion how to connect what we have to the signal generator?
where to look for new amplifier?

3) I found this RMS detector "ADL5511:  DC to 6 GHz Envelope and TruPwr RMS Detector" http://www.analog.com/en/rfif-components/detectors/adl5511/products/product.html
and planing to use it evaluation board http://www.analog.com/en/rfif-components/detectors/adl5511/products/EVAL-ADL5511/eb.html
does arduino can support the power request of 5 V/100 mA power supply?
how can I reduce the high frequency 60 V p-p to RFIN (RFIN AC-Coupled) 5.6 V p-p of this device (Parnell to output ceramic)?
can it be done only with resistors?
how to connect it vrms output to the arduino ?

any other questions I should ask my self?

thanks


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