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Génération numérique de signaux RF pour les terminaux de communication mobile par modulation delta-sigma

Abstract : In the software defined radio context, a digital transmitter based on ΔΣ modulation is proposed. Its architecture is built around two oversampled 3rd-order lowpass digital ΔΣ modulators that provide a multiplexed high-speed 1-bit data stream directly coding the RF signal in the digital domain. The output stream can then be fed to an efficient switching-mode power amplifier.
The UMTS standard has been taken as an application example and a digital RF signal generator providing the 1-bit output stream at 7.8Gs/s has been designed in a 90nm CMOS technology. Redundant arithmetic with complementary signal paths, non-exact output quantization and anticipated output evaluation have been implemented to reach the high sampling rate. 3-phase differential dynamic logic clocked by a DLL has been used at the circuit level.
The fabricated prototype transmitter IC demonstrates full functionality up to a 4GHz main clock frequency, reaching a maximum bandwidth of 50MHz at 1GHz center frequency with a 3.1dBm peak output power. When using the first image band, the transmit band can be moved up to 3 GHz. With a 2.6GHz main clock frequency and 5MHz WCDMA modulated channel at a carrier frequency of 650MHz, a channel output power of -3.9dBm and 53.6dB of ACPR are obtained. With the same settings, a channel output power of -15.8dBm and an ACPR of 44.3dB is reached in the 1.95GHz image band, which fulfills minimum UMTS requirements. The chip active area is 0.15mm² and its power consumption is 69mW for a 2.6GHz operating clock frequency.
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Contributor : Antoine Frappé <>
Submitted on : Tuesday, May 20, 2008 - 2:50:04 PM
Last modification on : Tuesday, December 8, 2020 - 3:32:34 AM
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  • HAL Id : tel-00280968, version 1

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Antoine Frappé. Génération numérique de signaux RF pour les terminaux de communication mobile par modulation delta-sigma. Micro and nanotechnologies/Microelectronics. Université des Sciences et Technologie de Lille - Lille I, 2007. English. ⟨tel-00280968⟩

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