HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation

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.
Complete list of metadata

Cited literature [61 references]  Display  Hide  Download

Contributor : Antoine Frappé Connect in order to contact the contributor
Submitted on : Tuesday, May 20, 2008 - 2:50:04 PM
Last modification on : Wednesday, March 23, 2022 - 3:50:20 PM
Long-term archiving on: : Friday, May 28, 2010 - 5:53:21 PM


  • HAL Id : tel-00280968, version 1


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⟩



Record views


Files downloads