Fully Differential Direct-Conversion Receiver for W-CDMA Reducing DC-Offset Variation

Hiroshi YOSHIDA; Takehiko TOYODA; Ichiro SETO; Ryuichi FUJIMOTO; Osamu WATANABE; Tadashi ARAI; Tetsuro ITAKURA; Hiroshi TSURUMI

Fully Differential Direct-Conversion Receiver for W-CDMA Reducing DC-Offset Variation

Hiroshi YOSHIDA, Takehiko TOYODA, Ichiro SETO, Ryuichi FUJIMOTO, Osamu WATANABE, Tadashi ARAI, Tetsuro ITAKURA, Hiroshi TSURUMI

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A fully differential direct conversion receiver IC for W-CDMA is presented. The receiver IC consists of an LNA, a quadrature demodulator, low-pass filters (LPFs), and variable gain amplifiers (VGAs). In order to suppress DC offset, which is the most important issue in a direct conversion system, an active harmonic mixer is applied to the quadrature demodulator. Furthermore, a receiving system, including the LNA and an RF filter, adopts a differential architecture to reduce local signal leakage, which generates DC offset. Performance of the entire receiving system was evaluated and DC offset in steady state was measured at only 40 mV. Moreover, DC offset variation at the LNA gain change, which has the largest affect on the receiving performance, was limited to 70 mV, which is less than -10 dB compared to desired signal strength. It was confirmed by computer simulation that the DC offset variation at the LNA gain change did not degrade bit error rate (BER) performance at all.

Publication: IEICE TRANSACTIONS on Electronics Vol.E87-C No.6 pp.901-908

Publication Date: 2004/06/01

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Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit and Device Technologies)

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Hiroshi YOSHIDA, Takehiko TOYODA, Ichiro SETO, Ryuichi FUJIMOTO, Osamu WATANABE, Tadashi ARAI, Tetsuro ITAKURA, Hiroshi TSURUMI, "Fully Differential Direct-Conversion Receiver for W-CDMA Reducing DC-Offset Variation" in IEICE TRANSACTIONS on Electronics, vol. E87-C, no. 6, pp. 901-908, June 2004, doi: .
Abstract: A fully differential direct conversion receiver IC for W-CDMA is presented. The receiver IC consists of an LNA, a quadrature demodulator, low-pass filters (LPFs), and variable gain amplifiers (VGAs). In order to suppress DC offset, which is the most important issue in a direct conversion system, an active harmonic mixer is applied to the quadrature demodulator. Furthermore, a receiving system, including the LNA and an RF filter, adopts a differential architecture to reduce local signal leakage, which generates DC offset. Performance of the entire receiving system was evaluated and DC offset in steady state was measured at only 40 mV. Moreover, DC offset variation at the LNA gain change, which has the largest affect on the receiving performance, was limited to 70 mV, which is less than -10 dB compared to desired signal strength. It was confirmed by computer simulation that the DC offset variation at the LNA gain change did not degrade bit error rate (BER) performance at all.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/e87-c_6_901/_p

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@ARTICLE{e87-c_6_901,
author={Hiroshi YOSHIDA, Takehiko TOYODA, Ichiro SETO, Ryuichi FUJIMOTO, Osamu WATANABE, Tadashi ARAI, Tetsuro ITAKURA, Hiroshi TSURUMI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Fully Differential Direct-Conversion Receiver for W-CDMA Reducing DC-Offset Variation},
year={2004},
volume={E87-C},
number={6},
pages={901-908},
abstract={A fully differential direct conversion receiver IC for W-CDMA is presented. The receiver IC consists of an LNA, a quadrature demodulator, low-pass filters (LPFs), and variable gain amplifiers (VGAs). In order to suppress DC offset, which is the most important issue in a direct conversion system, an active harmonic mixer is applied to the quadrature demodulator. Furthermore, a receiving system, including the LNA and an RF filter, adopts a differential architecture to reduce local signal leakage, which generates DC offset. Performance of the entire receiving system was evaluated and DC offset in steady state was measured at only 40 mV. Moreover, DC offset variation at the LNA gain change, which has the largest affect on the receiving performance, was limited to 70 mV, which is less than -10 dB compared to desired signal strength. It was confirmed by computer simulation that the DC offset variation at the LNA gain change did not degrade bit error rate (BER) performance at all.},
keywords={},
doi={},
ISSN={},
month={June},}

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TY - JOUR
TI - Fully Differential Direct-Conversion Receiver for W-CDMA Reducing DC-Offset Variation
T2 - IEICE TRANSACTIONS on Electronics
SP - 901
EP - 908
AU - Hiroshi YOSHIDA
AU - Takehiko TOYODA
AU - Ichiro SETO
AU - Ryuichi FUJIMOTO
AU - Osamu WATANABE
AU - Tadashi ARAI
AU - Tetsuro ITAKURA
AU - Hiroshi TSURUMI
PY - 2004
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E87-C
IS - 6
JA - IEICE TRANSACTIONS on Electronics
Y1 - June 2004
AB - A fully differential direct conversion receiver IC for W-CDMA is presented. The receiver IC consists of an LNA, a quadrature demodulator, low-pass filters (LPFs), and variable gain amplifiers (VGAs). In order to suppress DC offset, which is the most important issue in a direct conversion system, an active harmonic mixer is applied to the quadrature demodulator. Furthermore, a receiving system, including the LNA and an RF filter, adopts a differential architecture to reduce local signal leakage, which generates DC offset. Performance of the entire receiving system was evaluated and DC offset in steady state was measured at only 40 mV. Moreover, DC offset variation at the LNA gain change, which has the largest affect on the receiving performance, was limited to 70 mV, which is less than -10 dB compared to desired signal strength. It was confirmed by computer simulation that the DC offset variation at the LNA gain change did not degrade bit error rate (BER) performance at all.
ER -