ARTÍCULO

Low frequency noise analysis and minimization in Gilbert-cell-based mixers for direct conversion (zero-IF) low power front ends

Autores: Alvarado Videira, Unai; Berenguer Pérez, Roque José; Adin Marcos, Íñigo; Mayordomo Lastra, Iker; Vaz Serrano, Alexander José; Bistue García, Guillermo
Título de la revista: INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
ISSN: 0098-9886
Volumen: 38
Número: 2
Páginas: 123 - 129
Fecha de publicación: 2010
Lugar: WOS
Resumen:
Low-frequency (flicker) noise is one of the most important issues in the design of direct-conversion zero-IF front-ends. Within the front-end building blocks, the direct-conversion mixer is critical in terms of flicker noise, since it performs the signal down-conversion to baseband. This paper analyzes the main sources of low-frequency noise in Gilbert-cell-based direct-conversion mixers, and several issues for minimizing the flicker noise while keeping a good mixer performance in terms of gain, noise figure and power consumption are introduced in a quantitative manner. In order to verify these issues, a CMOS Gilbert-cell-based zero-IF mixer has been fabricated and measured. A flicker noise as low as 10.4 dB is achieved (NF at 10 kHz) with a power consumption of only 2 mA from a 2.7 V power supply. More than 14.6 dB conversion gain and noise figure lower than 9 dB (DSB) are obtained from DC to 2.5 GHz with an LO power of -10 dBm, which makes this mixer suitable for a multi-standard low-power zero-IF front-end. Copyright (C) 2008 John Wiley & Sons, Ltd.