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Us Patents
Electrostatic Discharge (Esd) Protection Circuit With Reduced Node Capacitance
Ion E. Opris - Sunnyvale CA Joseph Biran - Sunnyvale CA
Assignee:
National Semiconductor Corporation - Santa Clara CA
International Classification:
H02H 900
US Classification:
361 56
Abstract:
An electrostatic discharge (ESD) protection circuit with reduced high frequency signal distortion includes an additional input shunting diode and a voltage follower amplifier. This second diode and the original input shunting diode are connected in series between the circuit node to be protected and circuit ground so as to limit the voltage level at such node during an ESD event. The voltage follower amplifier maintains a substantially constant voltage across this second diode, thereby maintaining a substantially constant diode junction capacitance. Hence, with the introduction of this additional, serially connected junction capacitance of the second diode, the nonlinear input capacitance responsible for input signal distortion is reduced, plus with a substantially constant diode junction capacitance due to the use of the voltage follower amplifier, such reduced capacitance remains substantially more constant over variations in the input signal voltage.
Method For Coating The Edge Of A Printed Circuit Board To Improve Its Moisture Resistance
By sealing the periphery of a printed circuit board, the previously exposed edges of the board are substantially prevented from moisture wicking. This sealing of the periphery can be made concurrently with the plating of through-holes on the board. With this process, current leakage paths due to board moisture wicking within the board is significantly reduced.
Compensation Of V.sub.be Non-Linearities Over Temperature By Using High Base Sheet Resistivity Devices
Fairchild Camera & Instrument Corporation - Mountain View CA
International Classification:
H01L 2356
US Classification:
357 28
Abstract:
In a transistor circuit a linear relationship between V. sub. BE and temperature is obtained by using high base sheet resistivity devices, such as super beta NPN transistors, or lateral PNP transistors. Alternatively, high base sheet resistivity devices are fabricated having a non-linear V. sub. BE vs. temperature relationship that is matched to the non-linear V. sub. BE vs. temperature relationship of NPN devices and/or the non-linear resistivity of diffused resistors over temperature, such that the sum or difference of the non-linear terms will exactly cancel, providing a linear voltage vs. temperature relationship for the circuit as a whole.
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