Title:
電気物理層活動検出器
Document Type and Number:
Japanese Patent JP5276710
Kind Code:
B2
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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Inventors:
McLeod, Scott Shii
Application Number:
JP2011500891A
Publication Date:
August 28, 2013
Filing Date:
March 17, 2009
Export Citation:
Assignee:
Standard Micro Systems Corporation
International Classes:
H03K5/08; H03D1/18
Domestic Patent References:
| JP2162812A | ||||
| JP2001524273A |
Foreign References:
| WO1998023027A1 | ||||
| US4893091 | ||||
| US5399991 | ||||
| US5512859 | ||||
| US5374897 |
Attorney, Agent or Firm:
Masaki Yamakawa
Shigeki Yamakawa
Shigeki Yamakawa