SWITCHED-CAPACITOR RADIOFREQUENCY DELAY CIRCUITS FOR NEXT GENERATION WIRELESS SYSTEMS
Yang, Jinyao
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https://hdl.handle.net/2142/124905
Description
Title
SWITCHED-CAPACITOR RADIOFREQUENCY DELAY CIRCUITS FOR NEXT GENERATION WIRELESS SYSTEMS
Author(s)
Yang, Jinyao
Issue Date
2021-05-01
Keyword(s)
delay circuit; RF engineering; next generation communication; harmonic transfer functions; switched capacitor; linear periodic time variant
Abstract
In next generation communication systems, because of high frequency, massive MIMO with hundreds of antennas should be used to transmit sufficient power. This number of antennas naturally generates tens of nanoseconds of delay, which needs to be compensated later on. Whereas phase shifters only work for narrowband signals and digital delay circuits require analog circuits with harsh linearity, true time delay in the RF domain is useful. Since none of the previous RF delay circuit designs produce tens of nanosecond delay, a switched capacitor circuit with 144 paths is proposed and simulated in this thesis. The simulation result shows that around 10 ns delay was successfully generated for wideband signals. Moreover, the harmonic transfer function of a typical delay circuit from output to input is derived.
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