RC FILTER CIRCUIT

RC FILTER CIRCUIT

PURPOSE:To maintain the time constant and frequency characteristic of a filter circuit at fixed levels against the variation of the ambient temperature by compensating the temperature of a resistance by using one or more thermistors and the temperature of a capacitor by using one or more capacitors...

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1. Verfasser: NAGASE MOTOHARU
Format: Patent
Sprache:eng
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BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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creator NAGASE MOTOHARU
description PURPOSE:To maintain the time constant and frequency characteristic of a filter circuit at fixed levels against the variation of the ambient temperature by compensating the temperature of a resistance by using one or more thermistors and the temperature of a capacitor by using one or more capacitors for compensation. CONSTITUTION:The resistance value of a resistance r1 increases proportionally to the ambient temperature as the ambient temperature rises. The resistance value of a thermistor r2 decreases by the increased amount of the resistance value of the resistance r1 as the ambient temperature rises. A temperature detection circuit 1 detects the ambient temperature and sends a temperature signal (a) which is proportional to the ambient temperature. A temperature compensation control circuit 2 sends 2-bit compensation control signals (b) and (c) which are proportional to the temperature signal (a). An analog switch S1 is turned on when the control signal (b) is 'H' and another analog signal S2 is turned on when the control signal (c) is 'H'. A capacitor C2 has the capacitance of a capacitor C1 which is reduced when the ambient temperature rises from a reference temperature by a unit temperature and a capacitor C3 has a capacitance which is twice as large as that of the capacitor C2.
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CONSTITUTION:The resistance value of a resistance r1 increases proportionally to the ambient temperature as the ambient temperature rises. The resistance value of a thermistor r2 decreases by the increased amount of the resistance value of the resistance r1 as the ambient temperature rises. A temperature detection circuit 1 detects the ambient temperature and sends a temperature signal (a) which is proportional to the ambient temperature. A temperature compensation control circuit 2 sends 2-bit compensation control signals (b) and (c) which are proportional to the temperature signal (a). An analog switch S1 is turned on when the control signal (b) is 'H' and another analog signal S2 is turned on when the control signal (c) is 'H'. 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CONSTITUTION:The resistance value of a resistance r1 increases proportionally to the ambient temperature as the ambient temperature rises. The resistance value of a thermistor r2 decreases by the increased amount of the resistance value of the resistance r1 as the ambient temperature rises. A temperature detection circuit 1 detects the ambient temperature and sends a temperature signal (a) which is proportional to the ambient temperature. A temperature compensation control circuit 2 sends 2-bit compensation control signals (b) and (c) which are proportional to the temperature signal (a). An analog switch S1 is turned on when the control signal (b) is 'H' and another analog signal S2 is turned on when the control signal (c) is 'H'. 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subjects BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
title RC FILTER CIRCUIT
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