Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1995-11-28
1998-04-14
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327 78, 327103, 327328, 327541, 361100, 330298, H02H 902, H03L 500
Patent
active
057397120
ABSTRACT:
An amplifying circuit has an amplifying section including an operational amplifier for receiving an input signal and a power transistor for receiving the output of the operational amplifier to drive a load resistor. The amplifying circuit further has an over-current protective section including a current detection transistor receiving the output signal of the operational amplifier and a comparator comparing the output voltage of the current detection transistor and a reference voltage to supply a control signal to the operational amplifier when the output level representing the load current for the load resistor exceeds a threshold. The source of the power transistor and the source of the current detection transistor are maintained at the same potential by connecting both the sources or by providing a feedback section. A wide range of the voltage signal and an accurate threshold for the load current can be obtained.
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Callahan Timothy P.
Englund Terry L.
NEC Corporation
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