Direct Sigma Delta GMSK modulator modeling and design for 2.5 G TX applications

Lofu, N.; Avitabile, G.; Bisanti, B.; Cipriani, S.

doi:10.1109/iscas.2004.1328973

2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512)

DOI: 10.1109/iscas.2004.1328973

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Direct Sigma Delta GMSK modulator modeling and design for 2.5 G TX applications

N. Lofu

G. Avitabile

B. Bisanti

et al.

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Cited by 2 publications

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“…Actually, this bandwidth is a bottleneck for typical modulation. Pre-emphasis digital filtering [4] and twopoint modulation [5] have to be used to extend modulation bandwidth. Finally, it is a tricky process as loop bandwidth and VCO gain have to be known precisely to counteract Process, Voltage and Temperature (PVT) variations.…”

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confidence: 99%

A new direct digital transmitter architecture for constant envelope modulation

Finateu

Belot

Badets

et al. 2007

2007 6th International Conference on Information, Communications &Amp; Signal Processing

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A high speed Direct Digital Synthesizer (DDS) based transmitter architecture is presented. The DDS driven by a Sigma Delta (Σ∆) locks by injection an LC-tank Oscillator on an upper harmonic. Moreover, the Injection Locked Oscillator (ILO) provides a band-pass filtering within its locking range which rejects out of band Σ∆ quantization noise. The DDS is detailed in order to explain how to design an output signal frequency close to the clock frequency. Then the architecture is modulated thanks to constant envelope modulation. Finally, ILO output is compared to high constraint mask such as GSM/DCS in order to simulate architecture capability.

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mentioning

confidence: 99%

A new direct digital transmitter architecture for constant envelope modulation

Finateu

Belot

Badets

et al. 2007

2007 6th International Conference on Information, Communications &Amp; Signal Processing

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Direct Decomposing Modulation Phase in GSM Passive Radar

Yun-fu

Wang

Tao

et al. 2007

2007 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

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Direct Sigma Delta GMSK modulator modeling and design for 2.5 G TX applications

Cited by 2 publications

References 2 publications

A new direct digital transmitter architecture for constant envelope modulation

A new direct digital transmitter architecture for constant envelope modulation

Direct Decomposing Modulation Phase in GSM Passive Radar

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