公开(公告)号：EP1738186A1

公开(公告)日：2007-01-03

申请号：EP05735087.8

申请日：2005-04-04

申请人： ATMEL CORPORATION

发明人： AJRAM, Sami ,  STRAZZIERI, Franck ,  GARCIA, Florent

IPC分类号： G01R19/00 ,  H03K5/153 ,  H03K5/22

CPC分类号： G01R19/16571 ,  G01R19/10 ,  G01R19/16576 ,  G01R19/16585 ,  H03K5/082 ,  H03K5/125 ,  H03K5/153 ,  H03K5/2481

摘要： A differential threshold voltage level detection circuit (300) receives (310, 350) a differential voltage pair (VP, VM) as an input, applying each component of the differential pair to an individual voltage shifting circuit (315). Each voltage shifting circuit is configured with a regulated (318) current producing a shifted and a non-shifted version in-phase ( VPH, VPL, VMN, VML). For a shifted set of output differential voltages, the shift magnitude is proportional to the current entering a shifting circuit and is configured to be less than a peak-to-peak magnitude of the differential voltage to be detected. A current mirror within the detector contains a current reference (Iref) configured to produce a current to be passed through a voltage generator. The current magnitude is sufficient to generate a regulated voltage output to the two current regulating devices that supply the voltage shifting circuits. An overlap detector (500) receiving (540-546) both differential voltage pairs (330, 335, 370, 375) produces a signal (VOUT) indicating an input is at a detection threshold.