Title:
LINE CURRENT MONITORING CIRCUIT AND COMMUNICATION APPARATUS PROVIDED WITH THE CIRCUIT
Document Type and Number:
Japanese Patent JP2005072871
Kind Code:
A
Abstract:
To realize an impedance matching between a balance signal transmission line and a communication load circuit by simple, miniaturized and inexpensive circuit constitution.
In a communication terminal 20A connecting a current detector 5 between an I/O terminal 2a and the communication load circuit 4 in series, a circuit of diodes D1', D2' having the same constitution and the same impedance characteristics as a circuit of light emitting diodes D1, D2 used for the current detector 5 is connected between the communication load circuit 4 and an I/O terminal 2b as a balance-unbalance conversion circuit 7.
Inventors:
KUSANO JIRO
Application Number:
JP2003298833A
Publication Date:
March 17, 2005
Filing Date:
August 22, 2003
Export Citation:
Assignee:
KEAKOMU KK
International Classes:
H03K17/78; H04B3/30; H04B3/46; (IPC1-7): H04B3/30; H03K17/78; H04B3/46
Attorney, Agent or Firm:
Takehiko Suzue
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto