A Low Power Transmitter for Phase-Shift Keying Modulation Schemes

Lee, Jaewon; Cho, Seonghwan

doi:10.1109/pimrc.2006.254480

Cited by 3 publications

(4 citation statements)

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“…These simulation results coincide well with the following upper bound of BER in the proposed architecture. Assuming that the transition interval adds noise, the theoretical upper bound of BER in the proposed architecture can be estimated as follows: (8) where and is the SNR per bit. As an example, (8) for is plotted in Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Modulation schemes such as quadrature phase-shift keying (QPSK) or quadrature amplitude modulation (QAM) cannot be supported since the output of the frequency synthesizer produces continuous phase and constant envelope signal. Manuscript A novel quadrature modulation transmitter architecture which supports noncontinuous phase modulation such as QPSK was briefly presented in [8]. However, the operation of the novel architecture has not been fully analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…However, the operation of the novel architecture has not been fully analyzed. The characteristic of the varying envelope was not explained and issues from nonideality such as gain and phase mismatches were not considered in [8] at all. In this brief, we fully analyze the operation of the proposed architecture, which includes the above issues.…”

Section: Introductionmentioning

confidence: 99%

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A Quadrature Modulation Transmitter Using Two Frequency Synthesizers

Lee

Cho

2007

IEEE Trans. Circuits Syst. II

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This brief analyzes a novel quadrature modulation transmitter architecture. The proposed architecture consists of only two frequency synthesizers, thereby reducing the RF and analog components such as RF mixer, analog filter, and digital-to-analog converter. Simulation results show that the bit-error rate and the spectral efficiency of the proposed method are close to those of conventional quadrature modulation scheme. The quadrature modulation transmitter can be implemented fully digitally through the proposed architecture if the all-digital frequency synthesizer is used.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Quadrature Modulation Transmitter Using Two Frequency Synthesizers

Lee

Cho

2007

IEEE Trans. Circuits Syst. II

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“…Θ αρχιτεκτονικι αυτι είναι δθμοφιλισ λόγω τθσ χαμθλισ κατανάλωςθσ και πολυπλοκότθτασ, ωςτόςο υποςτθρίηει διαμορφϊςεισ ςυνεχοφσ φάςθσ, δθλαδι κεωρθτικά δεν είναι κατάλλθλθ για PSK διαμορφϊςεισ. Στο[198] παρουςιάηεται μια μζκοδοσ που προςεγγίηει τθν BPSK διαμόρφωςθ, ωςτόςο ο ρυκμόσ μετάδοςθσ περιορίηεται από το εφροσ ηϊνθσ του…”

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The multitude of applications that Ultra-Wideband (UWB) technology can serve, from highspeed Wireless Personal Area Networks to Wireless Sensor Networks with precision Geolocation abilities, has attracted intense research interest in the implementation of UWB systems. The unusually wide range of frequencies assigned to UWB, from , allows UWB systems employing low order modulation schemes to enjoy high throughput at low power consumption. According to the foregoing assignment, however, UWB shares the spectrum with existing wireless networking technologies, and, thus, UWB emissions must be limited to a power spectral density below the threshold of , satisfying very stringent emission masks and introducing great challenges in the design of low power and small area transmitters.The subject of this thesis is the design of low power, fully integrated, CMOS UWB transmitters (TXs), with high spectral flexibility, high speed and high modulation quality. Due to the low power requirements, this work focused on the Impulse Radio technology, while the high spectral flexibility was partially addressed by a Multi-Band architecture, based on Up-Conversion. The resulting Multi-Band Impulse-Radio (MB-IR) TX architecture employs Gaussian baseband pulse shaping and Direct Sequence BPSK modulation.The key contributions of this thesis are a CMOS Gaussian Pulse Generator and a BSPK modulation topology, which jointly constitute a high performance analog baseband unit, and lead to a reconfigurable, low power, low EVM, Gigabit MB-IR UWB transmitter RFIC, which is FCC/ECC mask compliant without the need for any off-chip components.The novel Pulse Generator (PG) is based on non-linear shaping, so as to facilitate the configurability of the output pulse duration, and exploits the voltage transfer characteristic of a Resistive Loaded Asymmetrical CMOS Inverter (RLACI), which results in spectral sidelobes typically better than . The PG incorporates low voltage circuits of digital nature, while the MOSFET devices that undertake the pulse shaping avoid exclusive operation in weak inversion, in contrast to previous implementations. Consequently, the proposed CMOS PG is able to support higher throughput, as well as higher output amplitude, which relaxes considerably the design of the RF front end.

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