Clock generator and mobile device using the same

Abstract

The invention provides a clock generator for a mobile device, capable of operating in one of a full-power mode and a low-power mode according to a standby signal to generate a high-frequency clock signal and a low-frequency clock signal is disclosed. The clock generator includes a crystal oscillator, for generating an oscillation signal of a specific frequency according to the power mode of the clock generator; a frequency division block, for dividing the oscillation signal by a specific divisor according to the power mode of the clock generator to generate the low-frequency clock signal; and a buffer block, for amplifying the oscillation signal to generate the high-frequency clock signal; wherein during each power mode, a frequency of the low-frequency clock signal is substantially the same. The invention also provides a mobile device using the clock generator.

Description

technical field [0001] The present invention relates to a clock generator and a mobile communication device using it, in particular to a single oscillator crystal clock generator operable in different power modes to generate clock signals of different frequencies, and a mobile communication device using the clock generator equipment. Background technique [0002] With the continuous development of electronic technology, mobile communication devices may have more than one wireless communication service, such as GSM / GPRS / EGPRS (GGE), Bluetooth, Wi-Fi, WiMAX wireless communication service, LTE wireless communication service and so on. A modern mobile electronic device may include many wireless communication modules to respectively provide communication services corresponding to different communication standards. In addition, since the cost of a precise oscillator (eg, a crystal oscillator) is high, in order to reduce production costs, all wireless communication modules in a mo...

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Problems solved by technology

[0004] However, the hardware cost of the crystal oscillator is quite high

For example, for a mobile communication chip whose production cost is about 1-2 dollars, the cost of the high frequency oscillating crystal (for example, the cost is about 0.1 dollars) and the low frequency oscillating crystal (for example, the cost is about 0.15 dollars) are high Up to 20% of the entire chip production cost

Also, the area of ​​the printed circuit board required by the device increases due to the use of the multiple oscillators

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