EP 0583398 A4 19970305 - DRIVE AMPLIFIER FOR POWER LINE COMMUNICATIONS
Title (en)
DRIVE AMPLIFIER FOR POWER LINE COMMUNICATIONS
Publication
Application
Priority
US 69845591 A 19910510
Abstract (en)
[origin: WO9221177A1] A power line communications amplifier includes a first amplifier (23) which amplifies a transmit signal consistent within a first operating potential range, a second amplifier (52, 59, 61) which provides additional amplification of the transmit signal consistent within a second operating potential range, wherein the second range is larger than the first range, and a transformer (90) which is employed to couple the amplifier transmit signal output by the second amplifier (52, 59, 61) to the power line communications system. A feedback circuit (70, 71, 72) couples the output of the second amplifier (52, 59, 61) to the input of the first amplifier (23) and functions to maintain a low output impedance while the amplifier circuit operates in a transmit mode. Control circuit (14, 40) is coupled to the second amplifier (52, 59, 61) for switching the amplifier circuit from the transmit mode to a receive mode. While in the receive mode, the amplifier circuit presents a relatively high output impedance.
IPC 1-7
IPC 8 full level
H03F 3/30 (2006.01); H03F 3/72 (2006.01); H04B 3/54 (2006.01)
CPC (source: EP)
H03F 3/3076 (2013.01); H03F 3/72 (2013.01); H04B 3/54 (2013.01); H04B 2203/5425 (2013.01); H04B 2203/5483 (2013.01); H04B 2203/5495 (2013.01)
Citation (search report)
- [X] GB 1542629 A 19790321 - PLESSEY CO LTD
- [A] US 4637073 A 19870113 - SELIN JOHN R [US], et al
- See references of WO 9221177A1
Designated contracting state (EPC)
AT BE CH DE DK ES FR GR IT LI LU MC NL SE
DOCDB simple family (publication)
WO 9221177 A1 19921126; AU 2005192 A 19921230; EP 0583398 A1 19940223; EP 0583398 A4 19970305; GB 2271482 A 19940413; GB 9322081 D0 19940209
DOCDB simple family (application)
US 9203806 W 19920507; AU 2005192 A 19920507; EP 92912752 A 19920507; GB 9322081 A 19931026