KR20060121342A - Apparatus of matching for pam - Google Patents

Abstract

A matching apparatus of a PAM(Power Amplitude Module) is provided to increase efficiency of the PAM by varying an impedance matching value of the PAM to be appropriate for a high mode or a low mode of a mobile communication terminal. In a matching apparatus of a power amplitude module(PAM)(108) varying an impedance matching value of the PAM of a mobile communication terminal, an RSSI(Received Signal Strength Indication) measurement part(106) measures the strength of received electric field. A memory part(102) stores first and second impedance matching values corresponding to a low mode and a high mode respectively. The power amplitude module(PAM) amplifies power of transmitting and receiving signals. An impedance matching part(110) is connected to an output stage of the power amplitude module and matches impedance of the power amplitude module. A control part(100) adjusts the impedance matching value of the impedance matching part according to the strength of the received electric field measured by the RSSI measurement part.

Description

Matching device for power amplifier module {APPARATUS OF MATCHING FOR PAM}

1 is a block diagram of a mobile communication terminal according to an embodiment of the present invention.

FIG. 2 is a detailed circuit diagram of the impedance matching device of FIG. 1.

3 and 4 are processing flowcharts of the controller of FIG. 1;

5 is a structural diagram of an impedance matching table of FIG. 1.

<Explanation of symbols for the main parts of the drawings>

100: control unit

102: memory

104: operation panel

106: RSSI measurement unit

108: PAM

110: impedance matching unit

The present invention relates to a mobile communication terminal, and more particularly, to an impedance matching device of a power amplification module (hereinafter referred to as PAM) provided in a mobile communication terminal.

Recently, with the rapid spread of mobile communication terminals, it is possible to transmit and receive video or audio information without restriction of time and space. In the mobile communication terminal, PAM is one of power consuming components, and is an important component for determining a battery usage time of the mobile communication terminal. Therefore, efforts have been made to improve the efficiency of the PAM.

For example, Korean Patent No. 10-2003-0017359 filed with a power amplification circuit in the name of the Korean Patent Office, by attaching an impedance matching circuit to the output terminal of the power amplifier in the mobile terminal by reducing the amount of current consumed at the maximum output level A power amplifier capable of extending talk time is disclosed.

The power amplifier includes a plurality of amplifiers for amplifying an incoming signal into a communication terminal, and an output matching circuit connected between the plurality of amplifiers and an output terminal to vary an inductance value corresponding to a transmission or reception state.

As described above, the efficiency of the power amplification circuit is improved by changing the matching value of the power amplifier according to the transmission or reception state.

However, in general, a mobile communication terminal can communicate with low power (hereinafter, referred to as a low mode) in a strong electric field area where a distance from a base station is close, and on the contrary, a weak electric field area that is far from a base station. Can communicate in high power (hereinafter, referred to as high mode).

Since the Adjacent Carrier Power Ratio (ACPR) characteristic is most degraded in the high mode, the mobile communication terminal determines the impedance matching value for the PAM based on the high mode in consideration of the stability of the network.

As described above, when the impedance matching value for the PAM is determined based on the high mode, the efficiency in the low mode is lowered. Therefore, the impedance matching value of the PAM may be changed to be suitable for the high mode or the low mode, thereby increasing the efficiency of the PAM. There was an urgent need for the development of technology to make this work.

Meanwhile, in Korea, Code Division Multiple Access (CDMA) and PCS (Personal Communication System) are used together, and in the United States, Advanced Mobile Phone Service (AMPS) and US (United States) PCS The method is used together, and in Europe, a GSM (Groupe Speciale Mobile) method or a DCS (Digital Communication System) 1800 method applying the GSM to the 1,800 MHz band is used together.

As such various mobile communication methods are used together, the mobile communication terminal is also equipped with a dual band function, and the dual band function is a function that enables interworking with systems having different mobile communication methods, that is, frequency bands different from each other.

As described above, a PAM of a mobile communication terminal having a dual band function also needs to develop a technology for increasing the efficiency of PAM by varying an impedance matching value according to each frequency band.

The present invention is to overcome the above-described problems, to provide a PAM matching device that can increase the efficiency of the PAM by varying the impedance matching value of the PAM to suit the high mode or low mode of the mobile communication terminal device; For the purpose of

In addition, another object of the present invention is to provide a PAM matching device for increasing the efficiency of the PAM by varying the impedance matching value of the PAM of the mobile communication terminal having a dual band function according to the frequency band.

The matching device of the power amplifier module according to the present invention for achieving the above object and to solve the problems of the prior art matching the first and second impedance corresponding to the RSSI measuring unit, low mode or high mode respectively for measuring the received field strength A memory unit for storing a value, a power amplifier module for power amplifying a transmission / reception signal, an impedance matching unit connected to an output terminal of the power amplifier module to match an impedance of the power amplifier module, and a received electric field strength measured by the RSSI measurement unit If it is equal to or greater than a predetermined value, the first impedance matching value is read from the memory unit, and the impedance matching value of the impedance matching unit is adjusted to correspond to the first impedance matching value, and the received electric field strength measured by the RSSI measuring unit is less than or equal to a predetermined value. When the second impedance matching value is read from the memory unit, the second impedance matching value is compared with the second impedance matching value. It is characterized in that a control unit for adjusting the value of said impedance matching impedance matching.

In particular, the impedance matching unit may be coupled to an impedance matching circuit having a fixed impedance matching value by combining a plurality of impedance matching elements, and an output of the impedance matching circuit and varying an impedance matching value in which impedance varies according to a control voltage of the controller. It is characterized by including a wealth.

The memory unit of the matching device of the power amplification module further stores third and fourth impedance matching values corresponding to the first and second frequencies of the dual mode, respectively, and the controller controls the first of the frequencies of the dual mode. When the frequency is selected, the third impedance matching value is read from the memory unit, and the impedance matching value of the impedance matching unit is adjusted to correspond to the third impedance matching value, and when the second frequency among the dual mode frequencies is selected. The fourth impedance matching value is read from the memory unit, and the impedance matching value of the impedance matching unit is adjusted to correspond to the fourth impedance matching value.

The present invention can increase the efficiency of the PAM by varying the impedance matching value of the PAM provided in the mobile communication terminal according to the strong electric field environment or the weak electric field environment.

In addition, the present invention can increase the efficiency of the PAM by varying the impedance matching value of the PAM according to the frequency band of the mobile communication terminal.

A schematic configuration of a mobile communication terminal according to a preferred embodiment of the present invention will be described with reference to FIG. 1.

The control unit 100 controls the mobile communication terminal as a whole, and varies the impedance matching value of the impedance matching unit 110 according to a strong electric field environment or a weak electric field environment, or moves the mobile communication terminal. The impedance matching value of the impedance matching unit 110 is varied according to the frequency band of the communication terminal.

The memory unit 102 stores various pieces of information including a processing program of the controller 100, and particularly includes an impedance matching table according to a preferred embodiment of the present invention. As shown in FIG. 5, the impedance matching table stores an impedance first value and a second value corresponding to a low mode that is an operation mode in a strong electric field environment and a high mode that is an operation mode in a weak electric field environment, respectively. A third value and a fourth value, which are impedance matching values corresponding to the first frequency band and the second frequency band, which are frequency bands of the mobile terminal which is driven by the band, are stored.

The operation panel 104 includes a plurality of keys and the like, and receives information for selecting one of the dual band frequency bands and provides the received information to the controller 100.

Received Signal Strength Indication (RSSI) measuring unit 106 measures the received electric field strength and provides it to the control unit 100.

The PAM 108 amplifies the transmission and reception signals, and the impedance matching unit 110 matches the impedance of the PAM 108 to optimize power consumption of the PAM 108. In particular, the impedance matching unit 110 varies the impedance matching value under the control of the controller 100.

Here, the detailed circuit of the impedance matching unit 110 will be described with reference to FIG. 2.

The impedance matching unit 110 includes an impedance matching circuit 200 and an impedance matching value variable unit 202. The impedance matching circuit 200 is composed of a plurality of inductances connected in series and a plurality of capacitances connected between each inductance and between ground. Here, the impedance matching circuit 200 has a fixed impedance matching value. Between the output terminal of the impedance matching circuit 200 and the ground, an impedance matching value variable part 202 composed of a varactor which is a variable capacitance diode is connected.

Here, the selector of the variable impedance matching value 202 has a capacity according to the control voltage provided by the control unit 100, the control unit 100 is low mode, high mode, the first frequency band, the second frequency band As a result, different control voltages may be supplied to the selector of the impedance matching value varying unit 202 to adjust the impedance matching value of the impedance matching unit 110.

Now, the processing operation of the controller 100 of the mobile communication terminal will be described in detail.

First, the PAM impedance matching value is changed according to the low mode and the high mode with reference to FIG. 3.

The RSSI measuring unit 106 measures the received electric field strength and provides it to the control unit 100. The control unit 100 determines that the electric field is strong when the received electric field strength is more than a predetermined value, and drives the mobile communication terminal in a low mode. When the received electric field strength is less than or equal to a predetermined value, it is determined as a weak electric field state and the mobile communication terminal is driven even if it is not known.

In addition, when the received electric field strength is greater than or equal to a predetermined value (step 300), the controller 100 reads a first value, which is an impedance matching value corresponding to the low mode, from the impedance matching table of the memory unit 102. When the first value is read, the controller 100 generates a control voltage corresponding to the first value and provides the control voltage to the varactor of the impedance matching value variable unit 202. Accordingly, the varactor has a capacitance corresponding to the control voltage, and the impedance matching value of the impedance matching unit 110 is adjusted to the first value (step 304).

Unlike the above, if the received electric field strength is less than or equal to a predetermined value (300), the controller 100 reads a second value, which is an impedance matching value corresponding to the high mode, from the impedance matching table of the memory unit 102. When the second value is read, the control unit 100 generates a control voltage corresponding to the second value and provides the control voltage to the varactor of the impedance matching value changing unit 202. Accordingly, the varactor has a capacitance corresponding to the control voltage, and the impedance matching value of the impedance matching unit 110 is adjusted to the second value (step 302).

As described above, the present invention may improve the efficiency of the PAM 108 by varying the impedance matching value of the PAM 108 corresponding to the low mode or the high mode.

Now, a PAM impedance control method in a mobile communication terminal having a dual band function will be described with reference to FIG. 4.

If a command to drive one of the dual band frequencies is input through the operation panel 104 or the like, the controller 100 checks whether the frequency is the first frequency (step 400).

If the frequency is the first frequency, the controller 100 reads a third value, which is an impedance matching value corresponding to the first frequency, from the impedance matching table of the memory unit 102. When the third value is read, the controller 100 generates a control voltage corresponding to the third value and provides it to the varactor of the impedance matching value variable unit 202. Accordingly, the varactor has a capacitance corresponding to the control voltage, and the impedance matching value of the impedance matching unit 110 is adjusted to a third value (step 402).

Unlike the above description, if the frequency is the second frequency (step 404), the controller 100 reads a fourth value, which is an impedance matching value corresponding to the second frequency, from the impedance matching table of the memory unit 102. When the fourth value is read, the control unit 100 generates a control voltage corresponding to the fourth value and provides the control voltage to the varactor of the impedance matching value variable unit 202. Accordingly, the varactor has a capacitance corresponding to the control voltage, and the impedance matching value of the impedance matching unit 110 is adjusted to a fourth value (step 406).

In the above-described preferred embodiment of the present invention, only the impedance matching value is adjusted according to the high mode, the low mode, the first frequency, and the second frequency, but the high mode, the low mode, and the second frequency at the first frequency are illustrated. It is also apparent to those skilled in the art that the impedance matching value is adjusted differently according to the high mode and the low mode of.

As described above, the present invention has an advantage of increasing the efficiency of the PAM by varying the impedance matching value of the PAM appropriately for the high mode or the low mode of the mobile communication terminal.

In addition, the present invention has the advantage of increasing the efficiency of the PAM by varying the impedance matching value of the PAM of the mobile communication terminal having a dual band function according to the frequency band.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible.

Therefore, the spirit of the present invention should be grasped only by the claims described below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

Claims (3)

In the matching device of the power amplifier module for varying the impedance matching value of the power amplifier module of the mobile communication terminal, RSSI measuring unit for measuring the received electric field strength; A memory unit for storing first and second impedance matching values respectively corresponding to the low mode or the high mode; A power amplification module for power amplifying a transmission / reception signal; An impedance matching unit connected to an output terminal of the power amplifier module to match an impedance of the power amplifier module; And When the received electric field strength measured by the RSSI measurement unit is equal to or greater than a predetermined value, the first impedance matching value is read from the memory unit, and the impedance matching unit of the impedance matching unit is adjusted to correspond to the first impedance matching value, and the RSSI measurement is performed. A control unit for reading the second impedance matching value from the memory unit to adjust the impedance matching value of the impedance matching unit to correspond to the second impedance matching value if the received measured electric field strength is less than or equal to a predetermined value; Matching device for a power amplification module comprising a. The method of claim 1, The impedance matching unit An impedance matching circuit in which a plurality of impedance matching elements are combined to have a fixed impedance matching value; And An impedance matching value variable unit connected to an output terminal of the impedance matching circuit, the impedance of which varies according to a control voltage of the controller Matching device for a power amplification module comprising a. The method of claim 1, The memory unit further stores third and fourth impedance matching values respectively corresponding to the first and second frequencies of the dual mode; The controller reads the third impedance matching value from the memory unit when the first frequency is selected among the frequencies of the dual mode, and adjusts the impedance matching value of the impedance matching unit to correspond to the third impedance matching value. When the second frequency of the dual-mode frequency is selected, the fourth impedance matching value is read from the memory unit to adjust the impedance matching value of the impedance matching unit to correspond to the fourth impedance matching value Module matching device.

Images