Islamic Republic of Iran Air Force
Abstract: (2713 Views)
In this paper, design and implementation of a multi-standard quadrature delta-sigma modulator (QDSM) with a new structure is presented. This third order, FF, continuous time (CT), low pass (LP) QDSM is designed to supported the WLAN/WCDMA/GSM standards in low-IF receivers. The modulator is operates at single-bit real state in GSM mode and -to achieve the required bandwidth and SNR- multi-bit quadrature state in WLAN/WCDMA modes. To remove the DACs errors between I and Q paths, the DACs are designed to complex. Implemented in 180-nm CMOS, the modulator achieves 54/75.9/81.63 dB SNR and 1.63/0.6/0.824 (pj/s Walden FoM) (131.06/163.35/156.24 dB Schreier FoM) FOM for WLAN/WCDMA/GSM operating modes respectively.
Type of Article:
Research |
Subject:
Electronic Received: 2018/02/18 | Accepted: 2019/04/10 | Published: 2019/12/27