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Oscillator Correcting Circuit And Method And Integrated Circuit

A technology of correction circuit and correction method, which is applied in the correction circuit of oscillators and the field of integrated circuits with oscillator correction circuits, which can solve the problems of increasing chip testing costs, limited signal channels, and limited functions.

Active Publication Date: 2014-08-06
NUVOTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited function of the control software or the limited signal channel (channel) connected to the chip pin (pin), the cheap test machine can only calibrate the oscillator in one chip at a time, but cannot calibrate the oscillations in multiple chips at the same time. device
But this will increase the cost of chip testing

Method used

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  • Oscillator Correcting Circuit And Method And Integrated Circuit
  • Oscillator Correcting Circuit And Method And Integrated Circuit
  • Oscillator Correcting Circuit And Method And Integrated Circuit

Examples

Experimental program
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Embodiment Construction

[0014] figure 1 is a schematic diagram of an oscillator calibration circuit 100 according to an embodiment of the present invention. The oscillator calibration circuit 100 can be built in the integrated circuit 110 . The oscillator calibration circuit 100 can receive three signals from a testing machine outside the integrated circuit 110 , namely a reference clock signal REF_CLK, a calibration signal TRIM_EN, and a programming signal PROGRAM_EN. The oscillator calibration circuit 100 includes a calibration module 120 , a recording module 150 , an oscillator 142 , and a multiplexer (multiplexer) 144 . The calibration module 120 is coupled to the oscillator 142 , the recording module 150 is coupled to the calibration module 120 , and the multiplexer 144 is coupled to the calibration module 120 , the recording module 150 and the oscillator 142 .

[0015] The oscillator 142 outputs an oscillating clock signal OSC_CLK. The oscillator 142 includes a plurality of impedance element...

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Abstract

An embodiment of the invention provides an oscillator correcting circuit and method and an integrated circuit. The circuit includes an oscillator, a correcting module and a recording module. The oscillator outputs an oscillation clock pulse signal and includes a plurality of impedance elements. One of correcting values controls the impedance value of at least one impedance element and the impedance values of the multipel impedance elements decide the frequency of the oscillation clock pulse signals. A correcting module is coupled to the oscillator. After a correcting signal is set, the correcting value is determined and output based on the multiple relation of the frequencyies of the oscillation clock pulse signal and the reference clock pulse signal. A recroding module is coupled to the correcting module and includes a nonvolatile memory. The recording mdoule records the correcting value in the nonvolatile memory after the recording signal is set.

Description

technical field [0001] The present invention relates to a correction circuit and method and an integrated circuit (IC), and in particular to an oscillator correction circuit and method and an integrated circuit with the oscillator correction circuit. Background technique [0002] In digital circuits, the importance of the clock signal is like the pulse of the human body. Many digital circuits include RC oscillators to generate clock pulse signals. The deviation of resistors and capacitors in the integrated circuit process is very large. For example, the deviation between the resistance value and the target value can reach 20% to 30%, which has a very adverse effect on the frequency of the clock pulse signal generated by the oscillator. . In addition, the ambient temperature in which the oscillator operates is also a variable. Therefore, when the integrated circuit is tested at the factory, the RC oscillator must be calibrated. [0003] The above-mentioned calibration is ...

Claims

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Application Information

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IPC IPC(8): H03K3/01H03K3/011
Inventor 游宗榜
Owner NUVOTON
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