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21. 发明申请

WO1993026087A1 FEEDBACK ISOLATION AMPLIFIER 审中-公开
标题翻译：反馈隔离放大器
公开(公告)号：WO1993026087A1
公开(公告)日：1993-12-23
申请号：PCT/US1993004793
申请日：1993-05-21
申请人： DIGITAL EQUIPMENT CORPORATION
发明人： DIGITAL EQUIPMENT CORPORATION , DALY, James, A.
IPC分类号： H03F03/08
CPC分类号： H03F3/38 , H03F1/347
摘要： An isolation amplifier employs feedback to accurately amplify an input signal (Sin) while maintaining electrical isolation between the input and output signals (Sout). The isolation amplifier consists of an amplitude modulator, an isolation transformer (101), having a pair of matched secondary windings, a peak-detector output circuit, and a matching peak-detector feedback circuit. The isolation transformer (101) couples an amplitude-modulated signal to both peak detector circuits while maintaining electrical isolation. The output from the feedback circuit is fed back to the amplitude modulator, so that the amplitude-modulated signal represents the difference between the input to the amplifier and the feedback signal.

22. 发明申请

WO1980002484A1 FEEDBACK ARRANGEMENT 审中-公开
标题翻译：反馈安排
公开(公告)号：WO1980002484A1
公开(公告)日：1980-11-13
申请号：PCT/US1980000511
申请日：1980-04-22
申请人： DYNAMIC COMPLIANCE INC
发明人： DYNAMIC COMPLIANCE INC , CARLSEN G
IPC分类号： H03F01/34
CPC分类号： H03F1/347
摘要： An arrangement to provide feedback to amplifier systems incorporating an electrical load. A current transformer in conjunction with a resistor is incorporated to provide a feedback correction signal to an amplifier which corrects for distortion caused by both the amplifier and the inductive load. A first embodiment provides a single-ended amplifier driving a load (27) and incorporates the current transformer (24) between the output of the amplifier (23) and the load (27). The secondary winding (26) of the transformer (24) is in series with the input to the amplifier, and a resistor (22) is connected across the secondary winding. The transformer (24) determines the frequency bandwidth of the entire amplifier system, and the resistor value determines the gain of the amplifier. Such a configuration provides negative feedback to the amplifier which is directly proportional to changes in current in the load. The second embodiment applies the principles of the present invention to a differential amplifier configuration. The primary winding (35) of the current transformer (34) is connected between the output of the amplifier (33) and one end of the load (38). A secondary winding (36) of the transformer is connected to the other end of the load (38) and to the negative input of the differential amplifier (33). A resistor is connected across the secondary winding (36) of the transformer (34).

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