Switched-capacitor radio frequency delay circuits for next generation wireless systems
Yang, Jinyao
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https://hdl.handle.net/2142/110277
Description
Title
Switched-capacitor radio frequency delay circuits for next generation wireless systems
Author(s)
Yang, Jinyao
Contributor(s)
Zhou, Jin
Issue Date
2021-05
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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