Method for controlling operating frequency of integrated circuit

A working frequency and integrated circuit technology, applied in the field of sharp changes in power supply current generated by the working frequency, can solve the problems of power supply current fluctuations, power supply voltage peak voltages, uncontrollable power supply voltage fluctuations, etc., to prevent misoperation and reduce power consumption. The effect of small positive pulse semaphore and stable power supply voltage

Inactive Publication Date: 2007-01-31
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even according to this technology, when the operation mode of the following integrated circuits is switched, for example: from a stop state to an operation state, from an operation state to a stop state, from an operation mode with low power consumption to a high power consumption mode The operating mode, or switching from an operating mode that consumes a large amount of power to an operating mode that consumes little power, will cause fluctuations in the power supply current, resulting in spikes in the power supply voltage
That is: when the working mode is switched, there will be a problem that the fluctuation of the power supply voltage cannot be controlled

Method used

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  • Method for controlling operating frequency of integrated circuit
  • Method for controlling operating frequency of integrated circuit
  • Method for controlling operating frequency of integrated circuit

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Embodiment Construction

[0035] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

[0036] figure 1 It is a circuit block diagram of an embodiment of the present invention. figure 1 The circuit includes a clock supply source 2 with a frequency adjustment function and a large scale integrated circuit 4 (LSI4). The LSI 4 is mounted on an assembly board such as a printed circuit board.

[0037] The LSI 4 is connected to a power supply circuit (not shown), and the power supply circuit applies a voltage E0 to the LSI 4 in a normal state. The current output from the power supply circuit to other than the LSI 4 will not be considered below. Therefore, the current supplied to the LSI 4 is equal to the power supply current i output from the power supply circuit.

[0038] FIG. 2 is a graph showing the operation of the LSI 4 when changing the operation mode. Fig. 2 (a) is the electric current (supply current) by LSI 4, Fig. 2 (b) is the power supply...

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Abstract

To stabilize source voltage by reducing spikes generated in the source voltage when switching operating modes of the integrated circuit. The operating frequency control method of the integrated circuit when switching a mode to the operating mode different in operating frequency changes the operating frequencies of the integrated circuit towards the operating frequency in the operating mode after switching step by step.

Description

technical field [0001] The present invention relates to an integrated circuit, and more particularly to a technique for mitigating sudden changes in power supply current generated when the operating frequency of the integrated circuit is changed. Background technique [0002] It is well known to suppress fluctuations in power supply voltage when an integrated circuit operates stably by adjusting the phase of a clock input to the internal circuit of the integrated circuit (for example, refer to Japanese Patent Laid-Open No. 2004-88638). [0003] (The problem to be solved by the invention) [0004] As described above, the power supply voltage can be stabilized by adjusting the phase of the input clock. However, even according to this technology, when the operation mode of the following integrated circuits is switched, for example: from a stop state to an operation state, from an operation state to a stop state, from an operation mode with low power consumption to a high power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/15H03K5/14G06F1/04G06F1/08H03K3/02H03K7/06
CPCG06F1/08G06F1/3203G06F1/324Y02B60/1217Y02D10/00
Inventor 北中贤则
Owner PANASONIC CORP
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