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Hello All,
I have designed a 300 GHz lens antenna and I want to test it. I have ordered its fabrication and its very small, it has to be attached with a lens and a PCB to hold it.
I have to measure s-parameters and radiation pattern. The antenna chip will also have detector mounted.
I want...
Hello everyone,
I have designed a circular waveguide module which expands at the center (like a B2B horn antenna, without radiation, its a waveguide only). Pictures are attached.
I can observe from the electric field distribution that the dominant TE11 mode of circular waveguide changes to an...
I got it, thanks!
By the way, the directional bridge circuit which you showed me last time, hasn't released by the company yet :( I am waiting for it for a month now.
https://www.analog.com/en/products/rf-microwave/rf-power-detectors/rms-responding-detector/adl5920.html#product-overview
So, I...
Hello everyone!
Today I measured the RF power range by using the bi-directional coupler for my project 'Return loss measurement using RF sensor as 50-ohm load). The block diagram of my project is attached below:
I measured both of the RF power ranges with the 20dB bi-directional coupler and...
Hello everyone
I'm using a few different microstrip calculators, but when I draw my trace, the suggested width (2.77mm) seems huge.
Calculator here: http://www.rfdh.com/
The transmission line needs to be 50 ohms as it connects directly with a 50 ohm matched impedance IC, of which the leads are...
Just to be on the safe side and to make things easier.
I am replacing the current SP4T switch with this one:
https://www.analog.com/en/products/rf-microwave/rf-switches/spst-spdt-sp3t-sp4t-sp6t-sp8t/adrf5040.html#product-overview
This switch requires a positive and negative supply voltages...
The IV_L is 0V to 3V and IV_H is 4.2V to 5V for this SP4T switch. In datasheet these voltages are all in negative but because the switch has internal binary decoder, connected to -5V VEE, we can supply 0V to 3V (positive) as low and 4.2V to 5V (positive) as high.
The link of the SP4T switch is...
Hi,
I can use ATmega128L to work on 3.3V but then how can I control the SP4T switch?
That switch in the block diagram needs logic of 0V-0V, 0V-5V, 5V-0V and 5V-5V to change the states among the 4 resonators.
That needs 5V and also its operating voltage is -5V (using invertor IC to produce...
Hi,
ATmega128 can run from 4.5 - 5.5V (written in datasheet). I have also ordered the evaluation kit of ATmega128 MCU. Therefore, I do not want to change MCU, but I can change ADC.
I was just ready about this ADC...
ADC choice is still in my hands. I can choose a 5V ADC to avoid extra circuitry for doing the level translation.
- - - Updated - - -
ADC choice is still in my hands. I can choose a 5V ADC to avoid extra circuitry for doing the level translation.
- - - Updated - - -
Now, I also think that...
By level translation do you mean the detection limit? 3mV to 3V is the input analog voltage (DC) range to ADC.
Secondly, is it a bad idea to use a 3.3V ADC with a 5V MCU? I was thinking the supply voltages does not matter as I have a power circuit in my system which has 12V to 5V and 5V to 3.3V...
Hi,
Yes, the ADC input can be treated as DC voltage. It should not fluctuate at one particular frequency (when the knob is not moving). The input to ADC is from 4V max to 4mV minimum. Moving when the knob is moving.
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Because I was wondering if the data will be sampled and processed quickly...
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