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Transmitter circuit, interface circuit, information terminal, interface method and recording medium

A technology for interface circuits and transmitters, which is applied in the field of interface circuits and transmitter circuits, can solve problems such as clock phase offsets, increase power consumption, and avoid the decline in transmission efficiency

Inactive Publication Date: 2014-01-01
NEC CASIO MOBILE COMM LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, due to the influence of heat generated by each of the IC devices and power supply noise, the phases of the clocks on the transmission side IC and the reception side IC may gradually shift

Method used

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  • Transmitter circuit, interface circuit, information terminal, interface method and recording medium
  • Transmitter circuit, interface circuit, information terminal, interface method and recording medium
  • Transmitter circuit, interface circuit, information terminal, interface method and recording medium

Examples

Experimental program
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Embodiment Construction

[0065] Hereinafter, embodiments of the present invention are described in detail with reference to the drawings.

[0066] The information terminal 1 according to the present embodiment is realized by a mobile phone, a PDA (Personal Digital Assistant), a smart phone, a PC (Personal Computer), etc., and has a high-speed wireless communication function.

[0067] In the internal configuration of the information terminal 1, figure 1 Shows the interface part of BB-IC (baseband integrated circuit) device and RF-IC (radio frequency integrated circuit) device and their associated parts. However, in order to facilitate the understanding of this embodiment, other components are omitted.

[0068] Such as figure 1 As shown, the information terminal 1 includes an antenna 60; an RF-IC device 20 that transmits and receives radio signals received by the antenna 60; a BB-IC device 10 that modulates and demodulates a transmitted signal and a received signal; The information terminal 1 executes a CPU...

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Abstract

A signal received by an antenna (60) is input to an encoder unit (201) and also to a discriminator unit (203). The discriminator unit (203) measures the length of a non-communication interval, and, if the length of the non-communication interval is equal to or greater than that of a predetermined interval, then outputs flag setting information. The encoder unit (201) performs a discrimination of sync pattern length on the basis of the flag setting information. The encoder unit (201) refers to the flag at the generation of a serial transmission frame and, if the flag has not been set, then sets the sync pattern length to a first value and, if the flag has been set, then sets the sync pattern length to a second value greater than the first value. The encoder unit (201) generates a serial transmission frame to which a sync pattern having the set sync pattern length has been added. A line driver unit (202) outputs the serial transmission frame generated.

Description

Technical field [0001] The present invention relates to a transmitter circuit, an interface circuit, an information terminal, an interface method, and a recording medium. Background technique [0002] Recently, a standard called DigRF has been established in the field of communication terminals such as mobile phones. DigRF is a standard related to the interface between RF-IC (Radio Frequency Integrated Circuit) devices and BB-IC (Baseband Integrated Circuit) devices. [0003] In the DigRF v4 (DigRF version 4) standard, the standard for the high-speed communication mode is a standard that performs serial transmission of the transmission path and the reception path between the RF-IC device and the BB-IC device at 1248 Mbps. In the DigRF v4 standard, the transmitting-side IC and the receiving-side IC respectively generate internal clock signals for serial transmission. Therefore, the phases of the clocks on the transmitting side IC and the receiving side IC may gradually shift due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/08
CPCH04J3/0685H04L7/042H04J3/0697H04W56/0015
Inventor 武藤贵志
Owner NEC CASIO MOBILE COMM LTD
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