Help modulate integrated active oscillator with 50 Mhz signal

[spide]

i have designed an integrated active oscillator(negative resistance) with patch antenna. i would like to modulate with the information signal of 50MHz. could anyone suggest any idea or informations on how i could combine both the signal to be transmitted.

 

[flatulent]

Re: active oscillator

There are several options. One is to vary the supply voltage with the data. This will crudely produce ASK and FSK at the same time.

If your design is not frozen, you can follow the oscillator with an amplifier and PIN diode switch to produce a higher quality ASK. Or you could put a variable capacitance diode across your resonator and make FSK.

One off the wall method would be to illuminate the circuit with a laser diode which will change some parameter of the emitted signal. Modulate the laser.

 

[spide]

Re: active oscillator

how to simulate using ADS2003, if i intend to used ASK modulation.