Balanced 3-phase analog signal processing for radio communications

Yamaji, Takafumi; Itakura, Tetsuro; Ito, Ryoko; Ueno, Takashi; Okuni, Hidenori

doi:10.1109/iscas.2006.1693452

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…The common-mode signal can be rejected with the common mode feedback [4]. That effect is the same for all multiple numbers of 3 rd harmonics.…”

Section: Proposed Down-convertermentioning

confidence: 99%

“…Similarly, for 3-node sets of AP/BP/CP, and AN/BN/CN, the desired signals are the 3-phase differential mode signals [4], and the 3 rd harmonics are the 3-phase common-mode signals. The common-mode signal can be rejected with the common mode feedback [4].…”

Section: Proposed Down-convertermentioning

confidence: 99%

“…It is the same as an ADC with 2-node input for differential signal does not outputs differential signal but a single digital signal. The 3-phase digital signal still has some redundancy and it is converted to I-and Q-signals [4]. The converter is shown as "3to2" in Fig.3.…”

Section: Proposed Down-convertermentioning

confidence: 99%

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A 6-phase harmonic rejection down-converter with digital assist

Yamaji

Matsuno

Aoyama

et al. 2010

2010 Symposium on VLSI Circuits

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A down-converter insensitive to 2 nd and 3 rd harmonics and a digital assisting circuit that cancels residual sensitivity due to device mismatches are proposed. Measured 2 nd and 3 rd harmonic rejection ratios of over 60 dB are achieved. This performance allows a simple RF filter, and it is effective to reduce the die size. IntroductionBroad band receivers have a design issue of avoiding harmonic mixing [1][2][3]. In a traditional balanced mixer, the switching operation by the LO signal generates the odd harmonics; while the even harmonics are suppressed because of the balanced circuits structure. As the results, RF signals at the odd multiple frequencies are down-converted to the baseband.There are two attractive down-conversion techniques for the harmonic rejection. One is the double-quadrature mixing (DQM) [1] that executes multiplication of two complex signals. DQM requires RF/IF poly-phase filters as phase-shifters, and the filters occupy large area.The other one is the poly-phase mixing [2]. A conventional poly-phase down-converter consists of weighted-gain mixers driven by 8-phase LO signals. The reduction ratio is limited around 30dB because of gain mismatch. A digital assisting technique that enlarges the reduction with 8-phase mixing was proposed [3]. However, the digital assisting system is able to cancel only a single (3rd or 5th) harmonic, and even harmonics are assumed to be sufficiently rejected only with device matching. We propose a harmonic rejection down-converter with digital assist to eliminate 2 nd and 3 rd harmonics.

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“…The common-mode signal can be rejected with the common mode feedback [4]. That effect is the same for all multiple numbers of 3 rd harmonics.…”

Section: Proposed Down-convertermentioning

confidence: 99%

Section: Proposed Down-convertermentioning

confidence: 99%

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A 6-phase harmonic rejection down-converter with digital assist

Yamaji

Matsuno

Aoyama

et al. 2010

2010 Symposium on VLSI Circuits

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“…Conventional complex signal processing uses 4-phase (quadrature) signals [1,2,6,7,8,9,10]. However, a 3-phase wireless receiver [11,12] and a 3-phase complex filter [13] were proposed for reducing analog chip area. In this paper, a high-image-rejection wireless-receiver architecture with a 3-phase active RC complex filter is proposed.…”

Section: Introductionmentioning

confidence: 99%

High-image-rejection wireless-receiver architecture with a 3-phase active RC complex filter

Ugajin

Kobayashi

Tsukahara³

2015

IEICE Electron. Express

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This paper proposes a high-image-rejection wireless-receiver architecture with a 3-phase active RC complex filter. The double conversion receiver, in cooperation with RF filter, rejects all image signals. In particular, the double conversion corrects the gain and phase mismatches of the adjacent image, and the image-rejection ratio of the adjacent image depends only on RC mismatches in the complex filter. Thus, the total image-rejection ratio of more than 60 dB can be expected for all the image signals.

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