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I have 2 problems about the IC chosen and circuit.
I want to do a PSK modulation/demodulation.
The carrier frequency is 14KHz.
Which modulator IC I can use?
Have any application note?
I am looking for a constant current source.
The current is 0.03mA.
Our modulators do not allow for the LO (carrier) at 14kHz.
We have an internal AC coupling cap on the RF output that blocks frequencies ~<50M’ish.
I think you’ll find a similar issue with most modulators.
My initial thought, for a 14kHz carrier frequency is I would recommend looking at a Digital to Analog Converter (DAC) and Analog to digital Converters (ADC). Type in DAC568 or DAC34 in the TI search engine.
Our high speed DACs (DAC904) allow for constant current out also. On the TI website you can type constant current source in the search engin and several links come up.
Or you can contact TI’s power group to see if they have something that will fit your needs.
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In reply to Chris Pearson:
Thank you for your reply.
I will try to do that your recommended.
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