Frequency selection type programmable filter

  • Inventors: FUJII MITSURU
  • Assignees: Nec Corp
  • Publication Date: December 14, 1992
  • Publication Number: JP-H04360409-A

Abstract

PURPOSE: To suppress an equivalent temperature change in a resistance to 1/10 or below in a conventional filter, to reduce the characteristic change over a wide temperature range and a wide frequency range and to attain high precision through the consideration on the temperature coefficient of the resistor by controlling a power supply voltage of an analog switch so as to make a temperature change in the analog switch almost zero. CONSTITUTION: The filter is provided with a filter circuit block 1 including a frequency tuning resistor 2 and an analog switch 3 connecting to each frequency tuning resistor 2 and with a power supply voltage control block 5 controlling on/off of the analog switch 3. The power supply voltage control block 5 is provided with a temperature detection diode 6 and power supply voltages VDD, VSS of the analog switch 3 are controlled by the temperature detected by the temperature detection diode 6. COPYRIGHT: (C)1992,JPO&Japio

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