Linear and Angular Modulator Using I/Q Mod Topology
Puri, Subash (2016)
Puri, Subash
Metropolia Ammattikorkeakoulu
2016
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-201605198584
https://urn.fi/URN:NBN:fi:amk-201605198584
Tiivistelmä
The thesis project was conducted to design and implement I/Q modulator and understand the flexibility of I/Q modulator to perform various kind of modulation with ease. It was also a prime focus of this thesis to identify effect of noise in carrier on the modulated signal and other possible sources of error.
Total of four stages, 90° phase shifter, mixers, gain and summing stages, were designed and their circuit board were constructed. All the components except LT5560 were available in the University laboratory. The modulator simulation was also performed on Multisim soft-ware and the results were studied.
After spectrum analysis of LT5560 at lower frequencies below 1 MHz, it was found that mixed signals gets highly attenuated and works pretty well above 5 MHz LO frequencies, but with leakage of LO frequency on output, hence the hardware implementation remained in-complete. Further analysis and fault finding can be done to make the system working and smaller in size.
Total of four stages, 90° phase shifter, mixers, gain and summing stages, were designed and their circuit board were constructed. All the components except LT5560 were available in the University laboratory. The modulator simulation was also performed on Multisim soft-ware and the results were studied.
After spectrum analysis of LT5560 at lower frequencies below 1 MHz, it was found that mixed signals gets highly attenuated and works pretty well above 5 MHz LO frequencies, but with leakage of LO frequency on output, hence the hardware implementation remained in-complete. Further analysis and fault finding can be done to make the system working and smaller in size.