Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Which of the following 3 solution is the prefered one to generate an amplitude modulated carrier frequency?
1) Waveform / function generator chip AD9102 / AD9106 (180 MHz) + single-ended buffer + low pass filter + VGA (for programmable amplitude: 10 mV ... 1 V) + bias tee (for DC component) +...
Thanks for the comments!
Then, I will use the AD9106 with 180 MSPS together with a 2nd order LPF with fc=20 MHz...
Following Nyqist, a sample rate of 25 MS/s would be sufficient for a 10 Mhz signal bandwidth. But, I thought it might be better to oversample 5x the carrier frequency? In the...
Hi,
Thanks! That makes sense and makes my decision easy. So, I will use the AD9106 that has a sample rate of 180 MHz, followed by a 2nd order 15 MHz low-pass filter. With this I should be able to generate sine waves (200 kHz - 10 MHz) with harmonics below -60 dB.
Do you think that analog I/Q...
Ok, I should be more precisely here: When I simulate low oversampling (fs=2.5*fc), the time-variant phase drift of the measurement signal's carrier frequency shows up in the demodulated amplitude signal.
If the AD9833 would be just a pure DAC (without internal clock or clock multiplication)...
Thanks, I am aware of all the noise contributions. For a 1uA-diode I calculated a total noise floor of about 6 mV rms for an output of 1 V which is acceptable.
Now, let me try to formulate my question more precisely:
Compared to a larger feedback resistor, a voltage divider between output and...
Dear electronic tinkerers,
I want to measure the current of a photo diode (1 pF, ca. 1 MOhm, 0.1-1 V pos. bias) with a large dynamic range (100 pA - 100 nA), with a high bandwidth (DC - 10 MHz) and, of course, with a good SNR of 60 dB or better.
The following paper summarizes the possible...
Dear electronic friends,
I am designing a multi-channel diode sensor PCB with high-frequency excitation (500 kHz - 10 MHz) and lock-in technique. The diode is excited with a high-frequency bias voltage and the current is measured via TIA. The light ("gate") of the diode modulates the amplitude...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
