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mishrashashi,
Thank you for your reply. Unfortunately I've tested many tools and techniques for general project management. These do not address the specifics of this kind of problem. Thanks again.
I've been dealing with this problem for a while:
How do you manage a hardware design project which is not part of your (day) job and your team is not contractually tied to it or to you?
For example, right now I'm an ECE graduate student and I'm working on developing some test equipment, which...
Hi Fovakis,
Sorry for the long delay. The crystal is your most accurate (for little money) source. If you can find a crystal of the exact frequency you need, that would be perfect. The simplest circuit would be a crystal with capacitors shunt to ground on each terminal, and an inverter going...
Hi peatear,
At the frequencies of a DC/DC converter, your whole pad is a single node, i.e. both red dots are short circuited, unless you don't have enough copper, so the larger the better. In particular, on your drawing, the current is going from the "in" node into the capacitors, and from the...
This would work:
You can do the math to calculate the phase shift according to R and C (Vout = Vin 1/(1+jwRC), get the angle). Oh, make the second inverter a Schmitt trigger so it doesn't trigger several times while the voltage on the capacitor is rising.
JP
Hi there again. A synthesizer is a Phase-lock loop (PLL) driving a VCO. One example would be the Texas Instruments TF3765. You give it a reference frequency from a crystal, say 25 MHz, and it can generate an output from 300 to 4800 MHz in steps of a few kHz. Analog devices, Linear Technologies...
Ok, so both the 30MHz and 2.4GHz are local oscillators (LO). They should both be as much like as a square wave as possible.
This is how mixers work. The LO must reverse the polarity as hard as possible. While the LO is near zero (a sine wave is much more time near zero than a square wave)...
It sounds like you are trying to up-convert a 30kHz baseband to 2.4GHz RF, right? If you are designing a transmitter you will need more specs. For the RF you will probably need a synthesizer, otherwise your frequency will be moving around. For the baseband you can use whatever you want. Make a...
The higher the frequency, the smaller the transformer. It's easy to find transformers for audio frequencies and they can be tiny. Any oscillator would work, even something based on a 555 timer.
JP
RFID would work, specially if the "tag" has to be passive (no power supply), but you have to orient it correctly with respect to the reader. A quick solution with prototyping boards, would be to have an RF transmitter (cheap 430 MHz) be the "tag" transmitting some code, and the device on the...
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