Title:
LINE CURRENT CONTROL CIRCUIT FOR TELEPHONE
Document Type and Number:
Japanese Patent JPH04230150
Kind Code:
A
Abstract:
PURPOSE: To increase the integration degree of components of a line current control circuit for a telephone set and to integrate as much as possible components other than the components inevitable for adjusting standards different from each country. CONSTITUTION: A voltage gain control circuit element 10 inserted between a first line terminating part 11 and a second line terminating part 12 is provided with a modulation terminal LN, connected to the first line terminating part and reference terminal connected to the second line terminating part present at a reference voltage through line current measurement resistance elements 9a and 9b. Also, this line current control circuit is provided with a first transistor T1, the main current route is inserted between the first line terminating part and the modulation terminal of the voltage gain control circuit element, and the gate electrode of the first transistor is connected through the control circuit to the resistance element.
More Like This:
Inventors:
JIYANN PIEERU KURUMANSU
PATORITSUKU BARII
PATORITSUKU BARII
Application Number:
JP13868791A
Publication Date:
August 19, 1992
Filing Date:
May 15, 1991
Export Citation:
Assignee:
PHILIPS NV
International Classes:
H04M1/76; H04M19/08; (IPC1-7): H04M1/76
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)