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Hi, all.
I am trying to measure phase changes according to difference materials.
I know the best way is to record applied and measured signal, but due to low sampling rate of ADC and high frequency of input sinusoidal waveform, I can not record them.
So, I wonder if there is a way to convert...
Hello,
I am using TRF7970EVM and commercialized external power amplifier to increase reading range.
As shown in schematic attached, I inserted inductor and two capacitors for 45 degree phase shift and those were connected to RX pins.
The waveform at RX pins showed perfect 45 degree shift...
How to isolate RF power?
Hello,
It might be very easy question for you but as I don't have sufficient knowledge and understanding of RF, it is a little hard to figure out for me.
The purpose is quite simple: I want to add a wire to the loop 13.56Hz antenna to receive its signal. As this...
Hello,
I am trying to make an inverted waveform with 13.56MHz frequency.
I tried several different circuits like common emitter with TR but it does not work in that frequency.
2N2222A npn BJT was used as it has wide frequency range but it does not generate inverted one.
According to datasheet...
Re: NFC chip with power amplifier design
Thank you mtwieg,
There are resistor between receiver and antenna which limits current to rx pin. I monitored voltage there and it was lower than its maximum value.
I also tried to isolated rx and antenna using transistor but it still it does not work.
I...
NFC chip with power amplifier design
hello,
I am trying to attach a power amplifier to the NFC chip so I could read out from distance (~30cm).
I though it would be quite simple but it does not work and drive me crazy..
Here is the circuit and block diagram I designed.
Would anyone could...
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