CN2932830Y

CN2932830Y - SD card FM receiver

Info

Publication number: CN2932830Y
Application number: CN 200620116566
Authority: CN
Inventors: 陈学尧
Original assignee: ZHONGYU TECHNOLOGY Co Ltd
Current assignee: ZHONGYU TECHNOLOGY Co Ltd
Priority date: 2006-06-14
Filing date: 2006-06-14
Publication date: 2007-08-08
Anticipated expiration: 2016-06-14

Abstract

A SD card type FM receiver relates to FM receiving arrangement, particularly to FM receiving arrangement of SD card type. The receiver comprises a casing (1), which is provided with circuit board (2), the circuit board is provided with receiving chip (3), periphery of which in respect to terminal pin of chip is provided with crystal oscillator (4), resistance (5), capacitor (6) and diode (7). The utility model makes modifications on the size of the FM reception part to put the FM reception part in the SD card. The new modified circuit is applicable to SD stand, which is provided with the broadcast devices such as MP3, being compatible with normal SD card, MMC card and FM receiving card of the utility model.

Description

SD card type FM receiving system

Technical field

The utility model relates to the FM receiving system, particularly SD card type FM receiving system.

Background technology

FM broadcasting is a very mature technique, being applied to all over the world by wide model in preceding half a century.It can send information to mass audience reliably with lower price, acceptable sound quality.So the FM broadcast receiver almost is integrated among the various forms of consumption electronic products.Up to now, all FM radio functions all are that the mode with the standalone feature module is fixedly mounted among the equipment.In other words, when increasing the FM radio function in the consumption electronic product, all be that whole FM function of radio receiver circuit is fixedly mounted in this consumption electronic product, become whole indivisible some.But along with miniaturization, the diversification of existing digital product, the FM radio function is fixed on that to become indivisible part in the audio-frequence player device undesirable.

Summary of the invention

The purpose of this utility model is to provide a kind of FM radio reception partly is installed in SD card type FM receiving system in the SD card structure.

The purpose of this utility model can realize like this, design a kind of SD card type FM receiving system, comprise housing, be provided with circuit board in the described housing, receiving chip is installed on the circuit board, is required to be provided with crystal oscillator, resistance, electric capacity, diode at the end pin of the peripheral corresponding chip of receiving chip.

Radio reception partly improves the utility model at FM.FM radio reception partly is placed in the SD card structure.This improvement allow on the playback equipment such as MP3 with the SD deck can compatible FM radio reception card.

Description of drawings

Fig. 1 is the schematic diagram of the circuit board section of the utility model preferred embodiment.

Fig. 2 is the schematic diagram of the circuit board section of the utility model preferred embodiment.

Fig. 3 is the schematic diagram of the housing of the utility model preferred embodiment.

Fig. 4 is the electrical schematic diagram of one of the utility model preferred embodiment.

Embodiment

The utility model will be further described below in conjunction with embodiment.

As Fig. 1, shown in Figure 3, a kind of SD card type FM receiving system comprises housing 1, is provided with circuit board 2 in the described housing 1, receiving chip 3 is installed on the circuit board, is required to be provided with crystal oscillator 4, resistance 5, electric capacity 6, diode 7 at the end pin of the peripheral corresponding chip of receiving chip 3.Utilize the reasonable distribution mode of main components and parts on circuit board, FM is received module be placed in the SD/MMC card size shell.

As Fig. 2, shown in Figure 3, described housing 1 is of a size of (30～31) * (21.5～23) * (1.9～2.1) millimeter, and housing wall thickness D1 is equal to or less than 0.3 millimeter; The height of described chip 3, crystal oscillator 4, resistance 5, electric capacity 6, diode 7 is less than 1.1 millimeters, and the thickness D4 of circuit board 2 and components and parts stack is less than 1.4 millimeters.

In the present embodiment, main components and parts are receiving chips 3 of FM.This chips can be selected the TEA5767HN as PHILIPS for use.It is the core of whole design, and overall height is 1.0MM.The important components and parts of next are crystal oscillator 4, and selected frequency is 32.768KHZ.This must be earlier with the thinnest a kind of, can make it highly be lower than receiving chip 3.In the used components and parts, at present the highest with the height of one group of electrochemical capacitor, even minimum element also reaches 1.1MM.So thick (height) that components and parts allow degree must be with this as adjusting the limit.

The thickness D3 that another factor that influences this receiver module thickness is a circuit board 2.The thinnest high-strength F R4 circuit board is that 0.3MM is thick at present.On circuit board, each components and parts all must be placed in one side to reduce gross thickness.

The thickness D1 of plastic casing, upper and lower covers respectively is 0.3MM, altogether 0.6MM.So if with upper and lower cover, circuit board and the thickest components and parts stack, gross thickness is 2.0MM, is less than the standard 2.1MM of SD card slightly.Stay 0.1MM as allowable tolerance.D2 is that shell is removed the height of outer casing thickness on one side.

Fig. 3 is the schematic diagram of housing.Wherein go up

lower cover

11 and 12 by injection molded production.Its thickness D1 can not surpass 0.3MM, and the space of maximum is provided for the cavity 13 of centre.So its total height of FM module (comprising FM receiver module+circuit board) that can place in the cavity 13 can reach 1.5MM.

Described housing also is provided with filler in the 1 formed inner space 13.After FM radio reception circuit was placed in the cavity 13 fully, its remaining space can select for use filler to fill up to increase integral intensity, further protective circuit and components and parts.Filler is the filler that does not hinder the filler of heat radiation or help to dispel the heat.

Because a large amount of portable consumer electronic products all possess the SD/MMC card slot, the utility model becomes another optional equipment of SD/MMC slot.

Though this design has been a FM receiving card, but still need the support of some ancillary equipment.These ancillary equipment have comprised external antenna, power supply, power amplifier and loud speaker or earphone.These equipment all are arranged in the corresponding consumption electronic product, and they all will be by the SD deck, existing contact links to each other with FM receiving card on the SD card.

Because some character of exporting into signal of FM radio reception card and SD card has suitable difference, when taking contact on the SD card, must match cautiously signal so go into when the output of FM.The 8th, 9 pin positions of described card base position are the end pin of stereosonic two output channels of FM, and the 6th pin position is ground wire and antenna duplexer pin position.

The signal of SD card and mmc card turnover is digital signal fully, but the FM card then is mixed with the FM antenna input of simulation or the output signal of audio frequency.So select for use two pin positions 8 of on the SD/MMC card, the most seldom using and 9 to be stereosonic two output channels of FM.Because this is the path of audio signal, so the peripheral circuit that cooperates should select for use a pair of analog switch to shunt this two signals.But analog switch must be able to provide enough passband frequency ranges, to prevent the being distortion that bandwidth causes inadequately.

In addition, the 6th pin is chosen as ground wire and the FM aerial signal is shared.At this, aerial signal will be led to the inlet of FM radio reception aircraft antenna through High frequency filter.Could guarantee the integrality of ground wire like this, reduce noise.

As shown in Figure 4, at receiving chip 3, adopt the TEA5767HN of PHILIPS in the present embodiment, 16,17 pin are connected with the crystal resonator that capacitor C 68, C69 form with crystal oscillator X2; 8 pin of receiving chip are the data pin, and 9 pin are clock, and 22,23 pin are the output of FM left and right acoustic channels; Filter input 35,37 pin that the antenna input is formed through filter and capacitor C 50, C51, the inductance L 9 of capacitor C 49, resistance R 43 compositions; 6 pin are ground connection.

Claims

1, a kind of SD card type FM receiving system, comprise housing (1), it is characterized in that: be provided with circuit board (2) in the described housing (1), receiving chip (3) is installed on the circuit board, is required to be provided with crystal oscillator (4), resistance (5), electric capacity (6), diode (7) at the end pin of the peripheral corresponding chip of receiving chip (3).

2, SD card type FM receiving system according to claim 1 is characterized in that: described housing (1) is of a size of (30～31) * (21.5～23) * (1.9～2.1) millimeter, and the housing wall thickness is equal to or less than 0.3 millimeter; The height of described chip (3), crystal oscillator (4), resistance (5), electric capacity (6), diode (7) is less than 1.1 millimeters, and the thickness of circuit board (2) and components and parts stack is less than 1.4 millimeters.

3, SD card type FM receiving system according to claim 1 is characterized in that: on the card base position of described SD card type FM receiving system the end pin that 2 pin positions are stereosonic two output channels of FM is set, a pin position is ground wire and antenna duplexer pin position.

4, SD card type FM receiving system according to claim 3, it is characterized in that: the 8th, 9 pin positions of described card base position are the end pin of stereosonic two output channels of FM, the 6th pin position is ground wire and antenna duplexer pin position.

5, SD card type FM receiving system according to claim 2, it is characterized in that: described housing (1) also is provided with filler in the formed inner space.