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Monolithic RC Filter

IP.com Disclosure Number: IPCOM000089967D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Najmann, KK: AUTHOR

Abstract

Noise and excessive currents create a problem in monolithic circuits. A positive voltage source is connected to terminal 10 and a negative voltage source to terminal 12 which in turn connect to N-type epitaxial layer 16 and P region substrate 14 respectively. Formed in collector substrate 18 is collector 20, base 22, and emitter 24. In order to eliminate AC noise, resistor 26 is connected between terminal 12 and P substrate 14. Resistor 26 and the capacitance between the PN junctions 27, formed by the P substrate 14 and the N diffused region 16 and 18, provide a high-frequency filter to remove noise present in the negative power source. Also, the addition of a resistor such as 26, at the appropriate location in the circuit, provides a current-limiting function, if the inherent resistance of the chip is very small.

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Monolithic RC Filter

Noise and excessive currents create a problem in monolithic circuits. A positive voltage source is connected to terminal 10 and a negative voltage source to terminal 12 which in turn connect to N-type epitaxial layer 16 and P region substrate 14 respectively. Formed in collector substrate 18 is collector 20, base 22, and emitter 24. In order to eliminate AC noise, resistor 26 is connected between terminal 12 and P substrate 14. Resistor 26 and the capacitance between the PN junctions 27, formed by the P substrate 14 and the N diffused region 16 and 18, provide a high-frequency filter to remove noise present in the negative power source. Also, the addition of a resistor such as 26, at the appropriate location in the circuit, provides a current-limiting function, if the inherent resistance of the chip is very small.

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