Global patent index - EP 1012883 A1

EP 1012883 A1 2000-06-28 - PHOTODETECTOR CIRCUIT

Title (en)

PHOTODETECTOR CIRCUIT

Title (de)

PHOTODETECTORSCHALTUNG

Title (fr)

CIRCUIT PHOTODETECTEUR

Publication

EP 1012883 A1 (EN)

Application

EP 98925866 A

Priority

  • GB 9801734 W
  • GB 9712368 A

Abstract (en)

[origin: CA2290965A1] A photodetector circuit (100) fabricated in BiCMOS exhibits improved temperature stability. A bipolar phototransistor (200) generates a photocurrent (Ibi) in response to illumination. This photocurrent (Ibi) is passed through a diode connected load MOSFET (114) operating subthreshold which gives a logarithmic voltage output. This ensures a large dynamic range of the photon detection system. The phototransistor (200) has gain (.beta.) which amplifies an initial current response and ensures that current Ibi) through the load MOSFET (114) is significantly higher than MOSFET leakage current. This improves performance at high temperatures when the leakage current is large, whilst maintaining photodetector sensitivity to low illumination levels. The photodetector circuit (100) is particularly suitable for incorporation in a detector array (315) for use in a digital camera.

IPC 1-7 (main, further and additional classification)

H01L 27/146

IPC 8 full level (invention and additional information)

H01L 27/146 (2006.01); H03F 1/30 (2006.01); H04N 5/355 (2011.01)

CPC (invention and additional information)

H03F 1/301 (2013.01); H04N 3/155 (2013.01); H04N 5/35509 (2013.01)

Citation (search report)

See references of WO 9858411A1

Designated contracting state (EPC)

BE CH DE FR GB IT LI NL

EPO simple patent family

GB 2326784 A 19981230; GB 9712368 D0 19970813; CA 2290965 A1 19981223; EP 1012883 A1 20000628; GB 2340600 A 20000223; GB 2340600 B 20010919; GB 9926002 D0 20000112; JP 2002508119 A 20020312; KR 20010013810 A 20010226; WO 9858411 A1 19981223

INPADOC legal status

2004-12-29 [18R] REFUSED

- Ref Legal Event Code: 18R

- Effective date: 20040808

2001-09-19 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: QINETIQ LIMITED

- Ref Legal Event Code: RAP1

2001-07-11 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20010529

2000-06-28 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19991105

2000-06-28 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): BE CH DE FR GB IT LI NL