Symmetrical electrical physical layer activity detector
A low-current differential signal activity detector circuit may be configured to reject large common mode signals on differential input lines, while still detecting smaller differential signals applied to the same set of differential input lines. The detector circuit may comprise a translinear buffe...
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Format | Patent |
Language | English |
Published |
20.03.2012
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Abstract | A low-current differential signal activity detector circuit may be configured to reject large common mode signals on differential input lines, while still detecting smaller differential signals applied to the same set of differential input lines. The detector circuit may comprise a translinear buffer that is driven at the buffer input and at the buffer output by the differential input signals. The differential signal thereby driving the inputs of the detector circuit may be half-wave rectified through the buffer output devices and may be filtered to provide the detected output. When applying a common mode signal, the buffer's input and output may track each other, and no current may be rectified in the output devices, thus providing common-mode signal rejection. The detector circuit may also be configured with two buffers having their outputs coupled to a common node, each buffer input driven by a respective one of the differential input signals. The differential signal thereby driving the inputs of the detector circuit may be fully rectified through the output devices of the two buffers, and may be filtered to provide the detected output. The two buffers may be configured in a symmetrical structure that allows for the rejection of common-mode signals when the outputs of the buffers are coupled to a common node. |
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AbstractList | A low-current differential signal activity detector circuit may be configured to reject large common mode signals on differential input lines, while still detecting smaller differential signals applied to the same set of differential input lines. The detector circuit may comprise a translinear buffer that is driven at the buffer input and at the buffer output by the differential input signals. The differential signal thereby driving the inputs of the detector circuit may be half-wave rectified through the buffer output devices and may be filtered to provide the detected output. When applying a common mode signal, the buffer's input and output may track each other, and no current may be rectified in the output devices, thus providing common-mode signal rejection. The detector circuit may also be configured with two buffers having their outputs coupled to a common node, each buffer input driven by a respective one of the differential input signals. The differential signal thereby driving the inputs of the detector circuit may be fully rectified through the output devices of the two buffers, and may be filtered to provide the detected output. The two buffers may be configured in a symmetrical structure that allows for the rejection of common-mode signals when the outputs of the buffers are coupled to a common node. |
Author | McLeod, Scott C |
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References | McLeod (7990182) 20110800 (9823027) 19980500 Partovi et al. (2007/0180281) 20070800 Self (2003/0164720) 20030900 Watanabe et al. (2003/0001666) 20030100 Ma et al. (2002/0094024) 20020700 Soltanian (2009/0108880) 20090400 Leyde et al. (5650750) 19970700 Momtaz et al. (2006/0208768) 20060900 "MOST: Media Oriented Systems Transport-MOST Specification Rev. 2.5," MOST Corporation, Oct. 2006, 242 pages. Berzins et al. (6781465) 20040800 Wu et al. (6727732) 20040400 Lai et al. (2005/0015687) 20050100 Lai et al. (7161877) 20070100 Seevinck, et al.; "Generalized Translinear Circuit Principle," IEEE Journal of Solid-State Circuits, vol. 26, No. 8, Aug. 1991, pp. 1098-1102. "MOST: Media Oriented Systems Transport-MAMAC Specification Rev. 1.1"; MOST Corporation, Dec. 2003, 26 pages. Kruczkowski et al. (6194965) 20010200 Chien (7113754) 20060900 Leete (7061279) 20060600 Lillis et al. (4893091) 19900100 Koyama et al. (2007/0188214) 20070800 Smith et al. (2001/0038312) 20011100 "MOST: Media Oriented Systems Transport-MOST Dynamic Specification Rev. 1.3," MOST Corporation; Dec. 2006, 137 pages. Zivanovic (2005/0253629) 20051100 International Search Report in Application No. PCT/US2009/037367 dated Jul. 10, 2009, 12 pages. |
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Snippet | A low-current differential signal activity detector circuit may be configured to reject large common mode signals on differential input lines, while still... |
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