Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

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
View PDF3 Cites 4 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Owner CHINA KEY SYST & INTEGRATED CIRCUIT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products