公开(公告)号：JPH08307523A

公开(公告)日：1996-11-22

申请号：JP1519596

申请日：1996-01-31

Applicant: ADVANCED MICRO DEVICES INC

Inventor： HAABAATO EMU KEE CHIEN

IPC: H04M3/02 ,  H04M19/02 ,  H04Q3/42

Abstract: PROBLEM TO BE SOLVED: To provide a ring generator circuit for simultaneously giving high- voltage ring signals to a plurality of ringers in a subscriber's line interface circuit(SLIC). SOLUTION: A ring generator circuit incorporates an adder 530 and a divider circuit which are connected to receive a DC offset signal and an AC reference signal from an SLIC. The adder 530 and divider circuit output a fractionized sum total signal. The signal is supplied to a full-wave rectifier 540 which rectifies the signal so that the signal may always become a positive voltage. The rectified signal is supplied to a switch control circuit 570, a first amplifier 550, and a second amplifier 560. The amplifiers 550 and 560 have the same gain of opposite signs or polarities, and are provided with a signal or a polarity. The outputs of the amplifiers 550 and 560 are sent to a rectifier switch 580 which is contorted by the output of the switch control circuit 570. The output of the control circuit is used for forcibly outputting a ring signal having the same polarity as the sum total signal or the opposite polarity to the switch 580.