Dear kspalla,
Thank you for your advice.
I found a ask modulation diagram as attached file(13.56MHz could be 1GHz).
Microprocessor's general i/o could provide data("1"/"0"), but how could l get 1GHz carrier to mix with data. From transmitter side, does it need a oscillator generate 1GHz carrier? How could I design a mixer to combine 1GHz carrier and data ? From receiver side, could the data be converted from ask modulation signal with 1GHz carrier by a envelop detector? Is there any other simple way?
Is there useful link or information about simple circuit of ASK transmitter and receiver by microprocessor at 1GHz?
Best Regard,
jerry