CN2899295Y - Architecture of a dual-mode mobile phone - Google Patents

Abstract

The utility model discloses a structure of a dual-mode mobile phone, which can reduce the number of used chips and improve the integration degree of mobile phone circuits. It includes a baseband chip, an antenna switch module, a dual-mode wireless transceiver chip, which integrates a GSM transceiver and a TD-SCDMA transceiver, and can realize the functions of a GSM transceiver and a TD-SCDMA transceiver, and a dual-mode power amplifier chip , it integrates GSM power amplifier and TD-SCDMA power amplifier, can realize the function of GSM power amplifier and TD-SCDMA power amplifier. Because integrating GSM wireless transceiver and TD-SCDMA wireless transceiver into one chip and integrating GSM power amplifier and TD-SCDMA power amplifier into one chip is of great significance to the miniaturization development of GSM/TD-SCDMA dual-mode mobile phones.

Description

Architecture of a dual-mode mobile phone

technical field

The utility model relates to a structure of a dual-mode mobile phone, in particular to a structure of a GSM/TD-SCDMA (Global System for Mobile Communications/Time Division Synchronous Code Division Multiple Access) dual-mode mobile phone.

Background technique

Among the GSM/TD-SCDMA dual-mode mobile phones developed by various mobile phone manufacturers based on different solutions, the currently popular GSM/TD-SCDMA dual-mode mobile phone architecture generally has two forms, as shown in Figures 1 and 2. The first It is a baseband chip, the RF front-end GSM part is a GSM transceiver and a GSM power amplifier, the TD-SCDMA part is a TD transceiver and a TD power amplifier; the second is that the baseband is also a chip, and the RF front-end GSM part is also a GSM transceiver and a GSM power amplifier, TD-SCDMA part is a TD transceiver and a TD transmitter.

Whether it is the transceiver plus power amplifier of the RF front-end TD-SCDMA part in the first architecture or the receiver plus transmitter of the RF front-end TD-SCDMA part in the second architecture, the RF front-end part of the two architectures must have four Only one chip can complete the sending and receiving of wireless signals. The common disadvantages of these two architectures are that the structure is complex, the number of chips used is large, the integration level is not high, the area occupied on the circuit board is large, and the circuit design is complicated, which is not conducive to the current development of mobile phones in the direction of miniaturization.

Utility model content

The utility model provides a structure of a dual-mode mobile phone, which can reduce the number of chips used and improve the integration degree of mobile phone circuits.

In order to solve the above technical problems, the utility model provides a dual-mode mobile phone architecture, which includes a baseband chip; an antenna switch module; a dual-mode transceiver, which integrates two modes of transceivers, can realize the two modes Mode transceiver function, the dual-mode transceiver receives the signal from the antenna switch module, and then outputs the signal to the baseband chip after conversion, and the baseband chip restores the original information through a series of processes such as demodulation and decoding, while The transmitting part of the dual-mode transceiver adopts a transmission scheme of twice frequency conversion, and the signal sent by the baseband chip is converted and output to the dual-mode power amplifier; a dual-mode power amplifier, which integrates two modes of power amplifiers , can realize the power amplifier function of the two modes, the dual-mode power amplifier receives the signal from the dual-mode power amplifier, and then sends the signal to the antenna switch module after it completes the power transfer function, and the antenna switch module Complete the transmission of the signal.

Because the utility model integrates the GSM wireless transceiver and the TD-SCDMA wireless transceiver into one chip, and integrates the GSM power amplifier and the TD-SCDMA power amplifier into one chip, which greatly simplifies the reception and transmission of the GSM/TD-SCDMA dual-mode mobile phone of the overall composition. The structure of the device reduces the number of chips used, simplifies the design of the radio frequency circuit of the GSM/TD-SCDMA dual-mode mobile phone, and uses a smaller circuit board area, which is of great significance to the miniaturization of the GSM/TD-SCDMA dual-mode mobile phone.

Description of drawings

The utility model will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a kind of structural representation of existing GSM/TD-SCDMA dual-mode mobile phone;

Fig. 2 is another kind of structural diagram of existing GSM/TD-SCDMA dual-mode mobile phone;

Fig. 3 is a schematic diagram of the structure of the utility model GSM/TD-SCDMA dual-mode mobile phone.

Detailed ways

Fig. 3 is a schematic diagram of the structure of the GSM/TD-SCDMA dual-mode mobile phone of the present invention. It mainly consists of four parts, the baseband chip 1, the dual-mode transceiver 2, the dual-mode power amplifier 3 and the antenna switch module 4 together constitute the architecture of the GSM and TD-SCDMA dual-mode mobile phone. From the perspective of the receiving path of the whole structure, the antenna switch module 4 converts the received working frequency wireless electromagnetic signal into a working frequency current signal and sends it to the dual-mode transceiver 2, and the receiving part of the dual-mode transceiver 2 converts the working frequency After the GSM or TD-SCDMA signal is down-converted to output the GSM or TD-SCDMA IQ signal that can be processed by the baseband chip 1, the baseband chip 1 will restore the original information through a series of processes such as demodulation and decoding. From the perspective of the transmission path of the entire architecture, the baseband chip 1 converts the original information into a GSM or TD-SCDMA IQ signal through a series of processing such as encoding and modulation, and outputs it to the transmitting part of the dual-mode transceiver 2. The dual-mode transceiver The transmitting part of 2 sends the IQ signal of GSM or TD-SCDMA to the GSM or TD-SCDMA signal of the working frequency through up-conversion, filtering and other processing to the dual-mode power amplifier 3, and the dual-mode power amplifier 3 completes the transfer of power After functioning, the signal is sent to the antenna switch module 4, and the antenna switch module 4 completes the signal transmission work of the GSM (TD-SCDMA) working frequency. In addition, the baseband chip 1 also needs to complete the control of the dual-mode transceiver 2, the dual-mode power amplifier 3 and the antenna switch module 4, so that the dual-mode mobile phone can correctly receive and transmit wireless signals.

Among them, the dual-mode transceiver 2 integrates the GSM transceiver and the TD-SCDMA transceiver. Function, whether the receiving part of the dual-mode transceiver 2 is GSM or TD-SCDMA, it adopts a zero-IF receiving scheme. The working frequency is directly mixed once, filtered, amplified and then down-converted to a differential IQ signal and output to the baseband chip. Such a receiving structure is simple and easy to implement, and various performance indicators also conform to the specifications of GSM and 3GPP receivers. Whether it is GSM or TD-SCDMA, the transmission part of the dual-mode transceiver 2 adopts a transmission scheme of twice frequency conversion. The differential IQ signal sent by the baseband chip 1 is first mixed and synthesized into an intermediate frequency signal. The signal of the second frequency mixing becomes the signal of the working frequency and is output to the dual-mode power amplifier 3 . VCO (Voltage Controlled Oscillator) and PLL (Phase Locked Loop) are also integrated in the launch section.

In addition, the dual-mode power amplifier 3 integrates the GSM power amplifier and the TD-SCDMA power amplifier. The main feature of the GSM and TD-SCDMA power amplifiers is that the nonlinear amplifier used by GSM and the linear amplifier used by TD-SCDMA are integrated in one chip. , which improves the efficiency of the PA (power amplifier), and the matching circuit of the PA is also integrated in the chip to obtain the smallest transmitting subsystem.

The structural changes of the utility model are mainly in two parts of the receiving and transmitting devices. The receiving device of the present utility model is composed of the following parts: antenna switch group 4, which is used to input the received signal received by the antenna to the dual-mode transceiver 2; the GSM receiving part of the dual-mode transceiver 2, which includes the operating frequency The GSM receiving ASIC circuit (application-specific integrated circuit) that converts the frequency into the baseband signal and the GSM baseband unit that inputs the GSM baseband signal. The so-called GSM receiving ASIC circuit mainly refers to the down-conversion of the working frequency signal from the switch to the baseband IQ signal. This part of the circuit, through the zero-IF receiving scheme, directly converts, filters, and amplifies the output baseband IQ signal. The GSM baseband part mainly refers to the IQ signal carrying information for demodulation, decoding and a series of processing to restore the original information sent. This part of the circuit; the TD-SCDMA receiving part of the dual-mode transceiver 2, which includes the TD-SCDMA receiving ASIC circuit that converts the operating frequency into a baseband signal and the TD-SCDMA baseband part that inputs the baseband signal of the TD-SCDMA mode, TD -SCDMA receiving ASIC circuit mainly refers to this part of the circuit that down-converts the working frequency signal coming in from the switch to the baseband IQ signal, through the zero-IF receiving scheme, directly converts, filters, amplifies and outputs the baseband IQ signal, TD-SCDMA baseband part It mainly refers to the part of the circuit that carries out a series of processing such as demodulation and decoding of the IQ signal carrying information, and restores the original information sent.

Emitting device of the present utility model is then made of following several parts: the GSM transmitting part of dual-mode transceiver 2, it comprises the GSM baseband part of the baseband signal of output GSM mode and the GSM transmission ASIC circuit that baseband signal frequency conversion becomes operating frequency; The TD-SCDMA transmitting part of dual-mode transceiver 2, it includes the TD-SCDMA baseband part of outputting the baseband signal of TD-SCDMA mode and the TD-SCDMA transmitting ASIC circuit that converts the baseband signal into the working frequency, so-called transmitting ASIC circuit refers to The IQ signal that the baseband is sent into, after two frequency conversions, the IQ signal is first up-converted to an intermediate frequency signal, and then up-converted to be the transmission signal of the working frequency and output to this part of the circuit of the dual-mode power amplifier 3; the dual-mode power amplifier 3, It is connected to the GSM transmitting ASIC circuit of the above-mentioned GSM transmitting part and the TD-SCDMA transmitting ASIC circuit of the above-mentioned TD-SCDMA transmitting part to receive the GSM and TD-SCDMA transmission signals from the dual-mode transceiver, and then convert the frequency-converted signal Amplify to a signal of required size; the antenna switch group is used to select the transmission signal output by the above-mentioned dual-mode power amplifier 3 and send it to the antenna, and then the antenna transmits the signal.

Therefore, the present invention relates to the receiving and transmitting device of dual-mode mobile phone architecture, especially a kind of GSM wireless transceiver and TD-SCDMA wireless transceiver are made into one chip, and GSM power amplifier and TD-SCDMA power amplifier are made into one chip , which greatly simplifies the architecture of the overall GSM/TD-SCDMA dual-mode mobile phone receiving and transmitting device, reduces the number of chips used, simplifies the design of the GSM/TD-SCDMA dual-mode mobile phone radio frequency circuit, and uses a smaller circuit board area. The miniaturization development of GSM/TD-SCDMA dual-mode mobile phones is of great significance.

Claims (5)

1, a kind of framework of dual-mode handset, it comprises baseband chip, and the duplexer module is characterized in that, and it also comprises:

A dual-mode transceiver, it the is integrated transceiver of two kinds of patterns, can realize this two kinds of pattern transceiver function, the acceptance division of described dual-mode transceiver receives the signal from the duplexer module, after passing through conversion then, signal is outputed to baseband chip, baseband chip is through demodulation, a series of processing such as decoding restore raw information, and the emission part of described dual-mode transceiver adopts the launch scenario of double conversion, and the signal that described baseband chip is sent into is exported to the bimodulus power amplifier through after the conversion;

A bimodulus power amplifier, the power amplifier of its integrated two kinds of pattern, can realize the power amplifier function of these two kinds of patterns, described bimodulus power amplifier receives the signal from dual-mode transceiver, it is sent to the duplexer module with signal after finishing the effect of moving to power then, and the duplexer module is finished the emission work to signal.

2, the framework of dual-mode handset as claimed in claim 1 is characterized in that, described dual-mode transceiver, integrated GSM transceiver and TD-SCDMA transceiver.

3, the framework of dual-mode handset as claimed in claim 1 is characterized in that, described bimodulus power amplifier, integrated GSM power amplifier and TD-SCDMA power amplifier.

4, the framework of dual-mode handset as claimed in claim 1 is characterized in that, the mode of operation of described dual-mode transceiver is controlled by baseband chip.

5, the framework of dual-mode handset as claimed in claim 1 is characterized in that, the mode of operation of described bimodulus power amplifier is controlled by baseband chip.

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