High performance frequency hopping transmitters using two-point delta-sigma modulation

This paper describes a 2.4 GHz high performance frequency hopping (HP) transmitter using two-point delta-sigma modulation (TPDSM). Two bottleneck problems in the implementation have been studied. One is the inherent gain and delay mismatches between two modulation points. The other is the nonlinear...

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Bibliographic Details
Main Authors: Peng, K.C., Huang, C.H., Pan, C.N., Horng, T.S.
Format: Conference Proceeding
Language:English
Subjects:
Applied sciences
Bandwidth
Baseband
Circuit properties
Circuits of signal characteristics conditioning (including delay circuits)
Delay
Delta-sigma modulation
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency shift keying
Frequency synthesizers
Phase locked loops
Radiocommunications
Telecommunications
Telecommunications and information theory
Throughput
Transmitters
Transmitters. Receivers
Voltage-controlled oscillators
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Summary:This paper describes a 2.4 GHz high performance frequency hopping (HP) transmitter using two-point delta-sigma modulation (TPDSM). Two bottleneck problems in the implementation have been studied. One is the inherent gain and delay mismatches between two modulation points. The other is the nonlinear performance of phase-locked loop (PLL). Both mismatch and nonlinear factors dominate the closed-loop modulation accuracy. Our simulation can predict the dependencies of modulation accuracy on both factors quite well. Comparison between simulation and measurement also shows good agreement. The implemented TPDSM-based FH GFSK transmitter can achieve 2.5 Mbps data rate and meanwhile 15 /spl mu/s PLL stable time with only 2.2% rms FSK error under good design and operating conditions.
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.2004.1339007