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Circuit and method for generating clock signals

A clock signal, circuit technology, applied in the direction of generating electrical pulses, pulse generation, electrical components, etc., can solve problems such as large manpower and time

Inactive Publication Date: 2012-07-11
STMICROELECTRONICS CHINA INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It will take a lot of manpower and time to achieve this

Method used

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  • Circuit and method for generating clock signals
  • Circuit and method for generating clock signals
  • Circuit and method for generating clock signals

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Embodiment Construction

[0020] The making and using of the embodiments are discussed in detail below. It should be understood, however, that the specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.

[0021] figure 1 A circuit 10 for generating a clock signal 103 according to one embodiment is shown. The circuit 10 includes a temperature sensor 105 and a calibration module 106 . The temperature sensor 105 is configured to sense a first temperature 107 of the clock source 101 and the calibration module 106 is configured to calibrate the clock signal 103 . Wherein, the clock source 101 is used for providing an oscillating signal 102 and is operatively placed at at least one second temperature 108 realized by the temperature changing module 104 .

[0022] First, the clock source 101 is placed at at least one second temperature 108 implemented by a temperature changing module 104 configured to change the temp...

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Abstract

The embodiment of the invention provides a circuit and method for generating clock signals. The circuit comprises a temperature sensor and a calibration module, wherein the temperature sensor is configured for sensing a first temperature of a clock source, the clock source is used for providing an oscillating signal and configured for experiencing at least one second temperature, the oscillating signal is used for being subjected to frequency demultiplication so as to obtain clock signals, the second temperature is implemented by a temperature change module, and the temperature change module is configured for changing the temperature near the clock source; and the calibration module is configured for calibrating the clock signals based on the first temperature, the at least one second temperature, a reference signal, and the oscillating signal at the at least one second temperature.

Description

technical field [0001] The present invention relates generally to electronic circuits, and more particularly to circuits and methods for generating clock signals. Background technique [0002] Real-time clock (RTC) devices are found in a variety of electronic devices that need to keep accurate time, such as personal computers, servers, and embedded systems. The RTC device divides the oscillation signal provided by the clock source, usually a 32.768 kHz quartz crystal, into a clock signal of eg 1 Hz. [0003] Most applications require clock accuracy better than 5ppm. Factors that affect clock accuracy include ambient temperature, ambient humidity, and vibration, among which ambient temperature has the greatest impact. Due to the characteristic of crystal frequency drifting with temperature, RTC devices, especially when used in a wide temperature range, need to be calibrated. [0004] Various methods have been applied to compensate the frequency deviation caused by temperat...

Claims

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Application Information

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IPC IPC(8): H03K3/012
CPCH03K3/011H03L1/027H03L1/02H03L1/022H03L1/023
Inventor 李晓先王慎
Owner STMICROELECTRONICS CHINA INVESTMENT