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Frequency locking device

A frequency locking and frequency technology, applied in the field of frequency locking devices, can solve the problems of increased production cost and increased power consumption of the overall device, and achieve the effect of reducing complexity and accurate frequency locking.

Inactive Publication Date: 2009-12-02
SONIX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two problems will result in an increase in the production cost of the overall device and an increase in power consumption during use

Method used

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Embodiment Construction

[0044] figure 2It is a schematic diagram showing a Universal Serial Bus (USB) device according to an embodiment of the present invention. The USB device 20 receives a keep alive signal (KAS) and / or start of frame (SOF) information generated by a computer (such as a computer), and communicates with the computer and transmits data. The USB device 20 includes a serial interface engine (Serial Interface Engine, SIE) 21 and a frequency locking device 22 . Both the serial interface engine 21 and the frequency locking device 22 receive the keep-alive signal KAS and / or the start-of-frame information SOF, and the frequency-locking device 22 generates an output frequency signal OF according to the keep-alive signal KAS and / or the start-of-frame information SOF. Wherein, the frequency of the output frequency signal OF is to lock a specific (preset) frequency in the transmission application between the calculator and the USB device 20, for example, to lock the transmission rate of the U...

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Abstract

The invention discloses a frequency locking device, which comprises a digital control oscillator and a comparison unit. The digital control oscillator is used for generating an output frequency signal. The comparison unit receives a persistent connection signal and / or a frame of initial information and the output frequency signal, and compares the persistent connection signal and / or the frame of initial information and the output frequency signal to generate a correction signal. The digital control oscillator adjusts the frequency of the output frequency signal according to the correction signal so as to lock the frequency of the output frequency signal as a specifically preset frequency in transmission application.

Description

technical field [0001] The present invention relates to a frequency locking device, in particular to a frequency locking device applied in a universal serial bus. Background technique [0002] figure 1 It shows a frequency locking device 10 disclosed in US Pat. No. 6,297,705 and applied to Universal Serial Bus (Universal Serial Bus, USB) data transmission. The frequency locking device 10 locks the output frequency of the oscillator 142 so that the frequency of the output frequency is equal to the rate of the input data stream input to the frequency locking device 10 . The main purpose of this technique is to accurately lock the output of the oscillator 142 to the rate of the input data stream without the cooperation of external components, and to use coarse and / or fine tuning when a single data packet (packet) is input. The way to provide a variety of phases (phases). [0003] figure 1 As shown, the frequency locking device 10 includes a control circuit 102 and an oscill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/00G06F13/00
Inventor 廖志明陈嘉章陈旻益
Owner SONIX TECH
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