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Patent Searching and Data


Title:
SIGNAL OUTPUT CIRCUIT
Document Type and Number:
Japanese Patent JP2017158010
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent a malfunction caused by noise superposed on an output terminal, while suppressing expansion of circuit scale and rising of a minimum operation voltage.SOLUTION: A signal output circuit 1 comprises a slope control circuit 6, a capacitor 9, a noise detection circuit 14 and a malfunction prevention circuit 7. The slope control circuit 6 charges/discharges the capacitor 9 of which the first terminal is connected to an output terminal 4, in accordance with a level of a control signal IN and controls a slope of an output signal OUT by driving a transistor 3 while using a voltage Vc at a second terminal of the capacitor 9. The noise detection circuit 14 detects noise superposed on the output terminal 4. When noise is detected, the malfunction prevention circuit 7 performs a forced driving operation for driving the transistor 3 in such a manner that an output signal OUT at a level corresponding to a level of a control signal IN is outputted, regardless of whether the transistor 3 is driven by the slope control circuit 6.SELECTED DRAWING: Figure 1

Inventors:
OKA NORIMASA
KAWAI HIROSHI
Application Number:
JP2016038953A
Publication Date:
September 07, 2017
Filing Date:
March 01, 2016
Export Citation:
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Assignee:
DENSO CORP
International Classes:
H03K17/16; H03K4/56; H03K5/12; H03K19/0175; H04L25/03
Attorney, Agent or Firm:
特許業務法人 サトー国際特許事務所