A 300-mW Programmable QAM Transceiver for VDSL Applications

Hyoungsik NAM
Tae Hun KIM
Yongchul SONG
Jae Hoon SHIM
Beomsup KIM
Yong Hoon LEE

IEICE TRANSACTIONS on Electronics   Vol.E87-C    No.8    pp.1367-1375
Publication Date: 2004/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
very-high-speed digital subscriber line,  programmable QAM transceiver,  IIR notch filter,  dual loop AGC,  low power,  

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This paper describes the design of a programmable QAM transceiver for VDSL applications. A 12-b DAC with 64-dB spurious-free dynamic range (SFDR) at 75-MS/s and an 11-b ADC with 72.3-dB SFDR at 70-MS/s are integrated in this complete physical layer IC. A digital IIR notch filter is included in order to not interrupt existing amateur radio bands. The proposed dual loop AGC adjusts the gain of a variable gain amplifier (VGA) to obtain maximum SNR while avoiding saturation. Using several low power techniques, the total power consumption is reduced to 300-mW at 1.8-V core and 3.3-V I/O supplies. The transceiver is fabricated in a 0.18-µm CMOS process and the chip size is 5-mm 5-mm. This VDSL transceiver supports 13-Mbps data rate over a 9000-ft channel with a BER < 10-7.