Global Patent Index - EP 1096831 A2

EP 1096831 A2 2001-05-02 - Semiconductor amplifying circuit and semiconductor electret condenser microphone

Title (en)

Semiconductor amplifying circuit and semiconductor electret condenser microphone

Title (de)

Halbleiterverstärkerschaltung und Halbleiterelektret-Kondensator Mikrofon

Title (fr)

Circuit amplificateur à semiconducteur et microphone capacitif à électret semiconducteur

Publication

EP 1096831 A2 (EN)

Application

EP 00307278 A

Priority

JP 28142099 A

Abstract (en)

To be resistant to effects of burst noise in semiconductor amplifying circuit and semiconductor electret condenser microphone. Constitution Comprising a voltage converting circuit 10 for receiving a weak signal alpha and issuing this signal as a voltage signal beta , and an amplifying circuit 20 for receiving the voltage signal beta and amplifying and issuing this signal, the voltage converting circuit 10 and amplifying circuit 20 are formed in a same semiconductor chip C. That is, since the input terminal of the amplifying circuit 20 is concealed in the semiconductor chip C, burst noise hardly gets into the amplifying circuit 20. <IMAGE>

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

H04R 19/00

IPC 8 full level (invention and additional information)

H04R 19/04 (2006.01); H03F 3/187 (2006.01); H04R 19/01 (2006.01)

CPC (invention and additional information)

H04R 19/01 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 1096831 A2 20010502; CN 1290998 A 20010411; JP 2001102875 A 20010413

INPADOC legal status


2004-03-10 [18W] APPLICATION WITHDRAWN

- Effective date: 20040113

2001-05-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2001-05-02 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI