Frequency adjustment devices and method of adjusting frequency

Abstract

The invention provides frequency adjustment devices. One of the devices includes a voltage drop detector and a frequency divider. The voltage drop detector compares a supply voltage with a threshold voltage to output a comparison result. The frequency divider divides a basic clock signal by a first value to use a result as a result clock signal for output when the supply voltage is greater than the threshold voltage; or divides the basic clock signal by a second value to use a result as the result clock signal when the supply voltage is less than the threshold voltage.

Description

technical field [0001] The present invention relates to a semiconductor chip, more precisely, the present invention relates to a semiconductor circuit whose frequency can be adjusted. Background technique [0002] Complex digital circuitry can be implemented within a semiconductor chip. A general digital circuit system requires a clock signal to perform synchronous operations. As the industry's requirements for product functions are getting higher and higher, the clock pulse of digital circuits needs to be continuously improved. This requirement is also evident in the part of the central processing unit. However, to achieve a high-speed clock, the supply voltage supplied to the digital circuit system must be relatively stable. If the supply voltage supplied to the digital circuit system is unstable, it may cause delays and errors in the digital circuit system. However, in reality, the external environment may cause the supply voltage to be unstable. For example, the nois...

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Problems solved by technology

If the supply voltage supplied to the digital circuit system is unstable, it is likely to cause delays and errors in the digital circuit system

However, in reality, the external environment may cause the supply voltage to be unstable. For example, the noise generated by the circuit board itself connected to the chip may cause a temporary voltage disturbance or drop in the voltage supplied to the digital circuit system.

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