Digital adjusting device and adjusting method of RC oscillator

A digital adjustment and oscillator technology, applied in power oscillators, automatic power control, electrical components, etc., can solve problems such as difficult circuit modification, and achieve the effect of increasing flexibility

Inactive Publication Date: 2019-11-22
CHENGDU ANALOG CIRCUIT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Difficult circuit modification when faced with RC oscillators of different frequencies

Method used

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  • Digital adjusting device and adjusting method of RC oscillator
  • Digital adjusting device and adjusting method of RC oscillator

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Embodiment Construction

[0026] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, the embodiment of the present invention provides a digital adjustment device for an RC oscillator, including an oscillator module, a counting module, a comparison module and an algorithm module, the oscillator module outputs a clock signal RCCLK, and the counting module receives the clock Signal RCCLK and reference clock REFCLK, and count the reference clock REFCLK through the clock signal RCCLK to obtain the actual count value REAL_NUM, the comparison module receives the actual count value REAL_NUM and the preset target count value REF_NUM, and Outputting the comparison result COMP_OUT to the algorithm module, the algorithm module calculates the adjustment value TRIM_OUT acc...

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PUM

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Abstract

The invention discloses a digital adjusting device of an RC oscillator and an adjusting method thereof, and relates to the technical field of integrated circuits. The device comprises an oscillator module, a counting module, a comparison module and an algorithm module, the oscillator module outputs a clock signal; the counting module receives the clock signal and a reference clock, counts the reference clock through the clock signal to obtain an actual counting value; the comparison module receives the actual count value and a preset target count value; wherein the comparison module is used for receiving a comparison result and outputting the comparison result to the algorithm module, the algorithm module is used for calculating an adjustment value according to the comparison result and sending the adjustment value to the oscillator module, and the oscillator module is used for adjusting the output frequency of the oscillator module according to the adjustment value. According to the technical scheme, the frequency of the RC oscillator is adjusted, the flexibility of the circuit is improved, and the power consumption of the circuit is reduced while the area of the circuit is not increased.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a digital adjustment device and an adjustment method for an RC oscillator. Background technique [0002] The current RC oscillator is an oscillator with resistors and capacitors as feedback and frequency selection components. Its outstanding feature is that it can generate very low vibration frequencies. Due to the process error in the manufacturing process of CMOS (complementary Metal-oxide-semiconductor, complementary metal oxide semiconductor), the manufactured capacitance and resistance of the RC oscillator, as well as the MOS (metal oxide semiconductor, metal oxide semiconductor) tube, size and design value There are errors. Now the CMOS process can usually control the accuracy of the gate oxide capacitance within ±20%, and some processes can maintain it within ±10%, and the error of the resistance is generally within ±20%. Due to the influence of process error...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/20H03L7/181
CPCH03B5/20H03L7/181
Inventor 周恩
Owner CHENGDU ANALOG CIRCUIT TECH INC
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