Automatic frequency calibration circuit for realizing active RC (Resistance Capacitance) filter by utilizing capacitance delay characteristics

An automatic frequency calibration and filter technology, applied in the direction of electrical components, output stability, etc., can solve problems such as cut-off frequency drift of active RC filters, and achieve the effect of preventing the influence of the circuit

Inactive Publication Date: 2012-10-24
CHINA KEY SYST & INTEGRATED CIRCUIT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology helps avoid changes caused by factors like processing or environmental conditions that affects how well an Active C Filter works with certain frequencies.

Problems solved by technology

This patented technology solves this problem by adjusting certain parameters in an Active Filter (AF) that can compensate for changes caused during manufacturing or use over time due to factors like ambient temperatures.

Method used

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  • Automatic frequency calibration circuit for realizing active RC (Resistance Capacitance) filter by utilizing capacitance delay characteristics
  • Automatic frequency calibration circuit for realizing active RC (Resistance Capacitance) filter by utilizing capacitance delay characteristics
  • Automatic frequency calibration circuit for realizing active RC (Resistance Capacitance) filter by utilizing capacitance delay characteristics

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Embodiment Construction

[0017] Such as Figure 1 to Figure 3 As shown, the present invention uses the capacitor delay characteristic to realize the automatic frequency calibration circuit of the active RC filter, and the schematic diagrams of the structure of the delay unit circuit and the charging current source circuit.

[0018] An automatic frequency calibration circuit for realizing an active RC filter by utilizing the delay characteristic of a capacitor, comprising a delay unit 2 and a digital part 1, wherein the capacitor array 21 in the delay unit 2 completely replicates the capacitor array 21 in the active RC filter circuit B Capacitor array B1, and both have the same control word signal S; the frequency division signal S_IN generated by the digital part 1, after the delay function of the delay unit 2, obtains the delay signal S_OUT, which is fed back to In the digital part 1, the counter 12 counts during this delay time, and compares the obtained count with the expected reference count windo...

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Abstract

The invention discloses an automatic frequency calibration circuit for realizing an active RC (Resistance Capacitance) filter by utilizing capacitance delay characteristics, which comprises a delay unit and a digital part, wherein a capacitor array in an active RC filter circuit is fully copied by the capacitor array in the delay unit; the capacitor arrays have the same control word signal; a frequency division signal generated by the digital part is delayed by the delay unit, thereby obtaining a delayed signal; the delayed signal is fed back to the digital part; a counter is used for counting within the delay time; an obtained counting value is compared with an expected reference counting value window; the control word signal of the capacitor array is correspondingly adjusted; and the adjusted control word signal of the capacitor array is used for automatically calibrating a frequency response of the active RC filter. The automatic frequency calibration circuit has the advantages that the change in the frequency response of the active RC filter circuit caused by the influences of technology, power voltage and temperature is avoided.

Description

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Claims

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Application Information

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Owner CHINA KEY SYST & INTEGRATED CIRCUIT
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