US 8,803,116 B2 · Receiving circuit having a switch for changing the generated reference voltage to one of a first and a second threshold value

Abstract

According to a receiving circuit includes a light receiving element, a signal voltage generation portion, a comparator, a reference voltage generation portion and a switch. The light receiving element receives a light signal and outputs a light current corresponding to the light signal. The signal voltage generation portion converts the light current into a signal voltage and outputs the signal voltage. The comparator compares the signal voltage with a first threshold value or a second threshold value. The reference voltage generation portion outputs a reference voltage input to the comparator. The switch changes the reference voltage to one of the first threshold value and the second threshold value based on an output of the comparator.

Claims20

Dependent claims

A receiving circuit comprising:

a light receiving element receiving a light signal and outputting a light current corresponding to the light signal;
a signal voltage generation portion converting the light current into a signal voltage and outputting the signal voltage;
a comparator comparing the signal voltage with a first threshold value or a second threshold value;
a reference voltage generation portion outputting a reference voltage input to the comparator;
and
a switch changing the reference voltage to one of the first threshold value and the second threshold value based on an output of the comparator.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/412,462Filed 5 Mar 2012

Priority

JP 2011-08720811 Apr 2011

Published

US 2012/0256081 A111 Oct 2012

Granted

12 Aug 2014

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

H03K 17/78
Characterised by the components used: using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
G01J 1/18
Using electric radiation detectors: using comparison with a reference electric value
G01J 1/44
Using electric radiation detectors: electric circuits
H03K 5/2481
Using field effect transistors: with at least one differential stage

Receiving circuit having a switch for changing the generated reference voltage to one of a first and a second threshold value

Life of this patent

Receiving circuit having a switch for changing the generated reference voltage to one of a first and a second threshold value

Life of this patent

Abstract

Claims20