WO2015074249A1

WO2015074249A1 - Wireless mobile communications terminal and transceiver system thereof

Info

Publication number: WO2015074249A1
Application number: PCT/CN2013/087697
Authority: WO
Inventors: 伍长林; 杜飞; 李飞
Original assignee: 海能达通信股份有限公司
Priority date: 2013-11-22
Filing date: 2013-11-22
Publication date: 2015-05-28

Abstract

A wireless mobile communications terminal and a transceiver system thereof. The transceiver system comprises multiple cascaded power amplifiers and a transceiver connected to a final-level power amplifier. The final-level power amplifier comprises a power divider, a combiner, and at least two switch tubes. An input end of the power divider is connected to an output end of a previous-level power amplifier. An output end of the combiner is connected to an input end of the transceiver. A control end of each of the switch tubes is connected one output end of the power divider. A first end of each of the switch tube is connected to an input end of the combiner. A second end of the each of the switch tubes is connected to reference ground. The first end of each of the switch tube is connected to an output pin of a battery by means of an inductor.

Description

Wireless mobile communication terminal and transceiver system thereof

Technical field

The present invention relates to the field of communications, and in particular, to a wireless mobile communication terminal and a transceiver system thereof.

Background technique

At present, most of the wireless mobile communication terminals adopt a single-cell battery 3.7V power supply mode. FIG. 1 is a logic diagram of the wireless communication terminal transceiver system, and the transceiver system includes: a plurality of cascaded power amplifiers U1, U2, U3, U4, a plurality of cascaded power amplifiers U1, U2, U3, U4 are sequentially connected with a transceiver U5, a low-pass filter U6 and an antenna, and a plurality of cascaded power amplifiers U1, U2, U3, U4 are in turn The π-type attenuator U7, the transceiver U8, the power amplifier U9 and the voltage-controlled oscillator U10 are connected, and the final-stage power amplifier U4 is powered by a single-cell battery of 3.7V. When the current is constant, the output power is only 34dBm, and then After passing through the transceiver U5 and the low-pass filter U6, the power reaching the antenna is 33 dBm (about 2 W), that is, the transmission power is within 2 W, so that the communication distance is limited. For a wireless mobile communication terminal with a transmission power of 4 W or more, when the current is constant, the final stage power amplifier of the transceiver system uses a 7.4 V power supply mode of the double-cell battery, as shown in FIG. 2, but the power supply method makes the product It is limited in terms of miniaturization and cost.

In combination with the above two methods, the existing wireless mobile communication terminal either has a short communication distance, or the double-cell battery increases the thickness and volume of the product, and also complicates the power supply circuit and the charging circuit, thereby making the cost high.

Summary of the invention

The technical problem to be solved by the present invention is to provide a wireless mobile communication terminal with a long communication distance, small volume and low cost, and a transceiver system thereof for the defects of the above-mentioned communication distance, volume and cost.

The technical solution adopted by the present invention to solve the technical problem thereof is: constructing a transceiver system of a wireless mobile communication terminal, comprising a plurality of cascaded power amplifiers and a transceiver connected to the final stage power amplifier, wherein the final stage power amplifier comprises :

a power splitter, wherein an input end of the power splitter is connected to an output end of the power amplifier of the previous stage;

a combiner, the output of the combiner being connected to an input end of the transceiver;

At least two switch tubes, wherein the control end of each switch tube is connected to one of the output ends of the splitter, and the first end of each switch tube is connected to one of the input ends of the combiner, and each switch tube The second end is connected to the reference ground, and the first end of each switch tube is connected to the output pin of the battery through an inductor.

In the transceiver system of the wireless mobile communication terminal of the present invention, the final stage power amplifier further includes: a plurality of combined microstrip lines and a combined pre-microstrip line corresponding to each of the switch tubes, The pre-combination microstrip line is connected between the first end of the corresponding switch tube and the corresponding input end of the combiner, and the plurality of combined microstrip lines are sequentially connected to the output end of the combiner and Between the input ends of the transceiver, wherein the carrier impedance of the output signal of the combiner and the impedance of the plurality of combined microstrip lines are stepwise.

In the transceiver system of the wireless mobile communication terminal according to the present invention, the number of the combined microstrip lines is greater than three.

In the transceiver system of the wireless mobile communication terminal of the present invention, the final stage power amplifier further includes at least one capacitor, one end of the capacitor is connected to the reference ground, and the other end is connected to the plurality of combined microstrip lines The corresponding microstrip line in the middle.

In the transceiver system of the wireless mobile communication terminal of the present invention, the final stage power amplifier further includes a first matching circuit corresponding to each of the switch tubes and configured to match a carrier impedance of the corresponding switch input signal, a first matching circuit is connected between the corresponding output of the power splitter and the control end of the corresponding switch .

In the transceiver system of the wireless mobile communication terminal of the present invention, the final stage power amplifier further includes a bias adjustment circuit corresponding to each of the switch tubes and configured to adjust a bias voltage of the corresponding switch tube, the bias voltage The output end of the voltage regulating circuit is connected to the control end of the corresponding switch tube .

In the transceiver system of the wireless mobile communication terminal of the present invention, the metal heat sink or the graphite heat sink is connected to the reference ground.

In the transceiver system of the wireless mobile communication terminal of the present invention, the transceiver system further includes a second matching circuit for matching a carrier impedance of the input signal of the final stage power amplifier, the second matching circuit is connected at the Between the output of the previous stage power amplifier and the input of the final stage power amplifier .

In the transceiver system of the wireless mobile communication terminal of the present invention, the transceiver system further includes a third matching circuit for matching a carrier impedance of the transceiver input signal, the third matching circuit being connected at the end Between the output of the stage power amplifier and the input of the transceiver .

The present invention also contemplates a wireless mobile communication terminal comprising the transceiver system described above.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a logic diagram of a transceiver system of a wireless mobile communication terminal in the prior art;

2 is a logic diagram of a transceiver system of another wireless mobile communication terminal in the prior art;

3 is a logic diagram of an embodiment of a final stage power amplifier in a transceiver system of a wireless mobile communication terminal of the present invention;

4 is a circuit diagram of an embodiment of a transceiver system of a wireless mobile communication terminal of the present invention.

detailed description

Figure 3 is The logic diagram of the last stage power amplifier embodiment in the transceiver system of the wireless mobile communication terminal of the present invention firstly illustrates that the transceiver system includes: a plurality of cascaded power amplifiers and a transceiver connected to the final stage power amplifier ( Refer to Figure 1 and Figure 2). In FIG. 3, the final stage power amplifier comprises: a power splitter 11, a combiner 12, an inductor L409 and two MOS transistors Q403, Q405, wherein the input of the splitter 11 is connected to the output of the previous stage power amplifier. The two output ends of the power divider 11 are respectively connected to the gate of the MOS transistor Q403 and the gate of the MOS transistor Q405, the source of the MOS transistor Q403 and the source of the MOS transistor Q405 are grounded respectively, and the drain of the MOS transistor Q403 is The drains of the MOS transistors Q405 are respectively coupled to the two input terminals of the router 12, and the output of the combiner 12 receives the input terminals of the transmitter. In addition, the output pin of the battery (for example, 3.7V voltage) is connected to the drain of the MOS transistor Q403 and the drain of the MOS transistor Q405 through the inductor L409.

The technical solution of the embodiment is implemented, and a small battery (for example, a single-cell battery of 3.7V) can also achieve a large transmission power (for example, 4W). The specific analysis is as follows: a single-cell battery is powered by 3.7V. The power is 4W as an example. In combination with FIG. 2, if the output power of the previous stage power amplifier U3 is 28dBm, when the transmission signal is input to the final stage power amplifier, in conjunction with FIG. 3, the power divider 11 will be the power amplifier U3 of the previous stage. The output power is distributed to two MOS transistors Q403 and Q405. The input power of each MOS transistor Q403 and Q405 is about 25dBm, and the supply voltages of the two MOS transistors Q403 and Q405 are 3.7V, and the gain is 9dBm respectively. When the current is constant, the output power is about 34dBm, respectively. Compared with the final stage power amplifier U4 in Figure 2, the output power of each MOS transistor Q403, Q405 is reduced by 3dBm (that is, the output power is halved). However, after the combiner 12 is combined, the power output by the combiner 12 is 37 dBm, that is, the output power of the final stage power amplifier shown in FIG. 3 is equal to the output power of the final stage power amplifier shown in FIG. Moreover, the transmission signal of the final stage power amplifier can reach 36dBm (ie, 4W) after reaching the antenna through the transceiver and low-pass filter (refer to FIG. 2). Therefore, the final stage power amplifier shown in FIG. 3 is compared with the final stage power amplifier of FIG. 2, although the power supply voltage is halved (single cell 3.7V voltage), but its transmission power remains unchanged at 4W. In addition, since the final stage power amplifier adopts a synthetic scheme of two MOS tubes, some third-order intermodulation products are canceled each other after synthesis, so that the final output third-order intermodulation products are effectively reduced, thereby improving the final stage power amplifier nonlinearity. Distortion effect.

4 is a circuit diagram of an embodiment of a transceiver system of a wireless mobile communication terminal of the present invention, in which a second matching circuit 15 is connected between a final stage power amplifier and a previous stage power amplifier, and the final stage power amplifier is transceived A third matching circuit 16 is connected between the devices, and the second matching circuit 15 is used to match the carrier impedance of the input signal of the final stage power amplifier, for example, generally 50. Ohm. The second matching circuit specifically includes an inductor L408, capacitors C439, C415, and C416, wherein the inductors L408 and C416 are sequentially connected in series between the output of the previous stage power amplifier and the input of the final stage power amplifier, and the capacitor C439 is connected to the inductor. Between one end of L408 and ground, capacitor C415 is connected between the other end of inductor L408 and ground. The third matching circuit 16 is configured to match the carrier impedance of the transceiver input signal, for example, generally 50. Ohm. The third matching circuit specifically includes an inductor L419, a capacitor C425, and a capacitor C449. The inductor L419 and the capacitor C425 are sequentially connected in series between the output end of the final stage power amplifier and the input end of the transceiver. One end of the capacitor C449 is grounded, and the other end is Connect the connection point of inductor L419 and capacitor C425.

In this embodiment, the final stage power amplifier includes: a power divider 11, a combiner 12, two MOS transistors Q403, Q405, an inductor L409, and a first matching circuit corresponding to each MOS transistor (for example, with MOS a first matching circuit 13) corresponding to the tube Q403, a bias adjustment circuit (for example, a bias adjustment circuit 14 corresponding to the MOS transistor Q403), wherein the input of the power divider 11 is connected to the output of the second matching circuit (ie, The capacitor C416), the two output ends of the power divider 11 are respectively connected to the first matching circuit corresponding to the MOS transistors Q403, Q405, for example, the first matching circuit 13 corresponding to the MOS transistor Q403, the first matching circuit Including the inductors L417, L422, capacitors C463, C470, wherein the first end of the inductor L417 is connected to the capacitor C416, and the second end of the inductor L417 is respectively connected to the first end of the inductor L422 and the first end of the capacitor C463, and the second end of the capacitor C463 The terminal is grounded, and the second end of the inductor L422 is connected to the gate of the MOS transistor Q403 through a capacitor C470. The source of the MOS transistor Q403 is grounded, one of the inputs of the drain combiner 12, and the output of the combiner 12 is connected to the input of the third matching circuit (ie, the inductor L419). In addition, MOS The drain of the transistor Q403 is also connected to a voltage of 3.7V through the inductor L409. MOS The gate of the tube Q403 is also connected to the output end of the bias voltage adjustment circuit 14. The bias voltage adjustment circuit 14 includes a bidirectional voltage regulator diode D404, resistors R432, R433, and a capacitor 469. The first end of the bidirectional Zener diode D404 is grounded. The second end is connected to the gate of the MOS transistor Q403 through a resistor R429. The resistor R432 is grounded at one end, and the other end is connected to the second end of the bidirectional Zener diode D404. One end of the resistor R433 is connected to the voltage of 3V, and the other end is connected to the bidirectional Zener diode D404. Second end. It should be noted that, the above only describes the circuit connection relationship related to the MOS transistor Q403, and the circuit connection relationship related to the MOS transistor Q405 is similar, and will not be described herein.

In the above embodiment, the first matching circuit is used to match the carrier impedance of the corresponding MOS transistor input signal so that the power of the corresponding MOS transistor passes through, thereby improving the efficiency of the final stage power amplifier. The bias voltage adjustment circuit is used to adjust the bias voltage of the corresponding MOS transistor so that the current flowing through each MOS transistor is uniform, thereby avoiding damage of the MOS transistor.

In addition, as shown in FIG. 4, the final stage power amplifier further includes a pre-combined microstrip line L11 and L12 corresponding to the MOS tubes Q403 and Q405, and four combined microstrip lines L21, L22, L23, and L24. Wherein, the pre-synthesis microstrip line L11 is connected between the drain of the MOS transistor Q403 and one input end of the combiner 12, and the pre-combined microstrip line L12 is connected to the drain of the MOS transistor Q405 and the combiner 12 Between one input end, the four combined microstrip lines L21, L22, L23, L24 are sequentially connected between the output end of the combiner 12 and the input end of the third matching circuit, wherein the output of the combiner 12 The carrier impedance of the signal and the impedance of the four microstrip lines L21, L22, L23, L24 are stepwise. For example, in a specific example, if the impedance of the microstrip lines L11 and L12 before the combination is 50, respectively Ohm, the carrier impedance of the output signal after the combiner 12 is 25 ohm, so the impedance of the microstrip lines L21, L22, L23, L24 after combining can be 35 ohm, 40 ohm, 45, respectively. Ohm, 50 ohm. Correspondingly, 35 ohm, 40 ohm, 45 ohm, 50 The ohm impedance characteristics correspond to the line widths of the microstrip lines being 1.2 mm, 0.9 mm, 0.8 mm, and 0.65 mm, respectively.

In this embodiment, by using a plurality of microstrip line synthesis and step gradient of the microstrip line impedance, it is further ensured that the power of the final stage power amplifier is larger, thereby improving the efficiency of the final stage power amplifier.

In order to save the area occupied by the PCB board, the plurality of combined microstrip lines are generally arranged in a fold line on the PCB board, for example, an S shape. At this time, multiple pins of the microstrip line on the PCB board can be loaded. The capacitor has one end connected to the reference ground and the other end connected to the corresponding microstrip line in the plurality of combined microstrip lines, so that the harmonics can be further suppressed.

In addition, in order to improve the heat dissipation performance of the wireless mobile communication terminal, a metal heat sink or a graphite heat sink may be connected to the reference ground.

Finally, it should be noted that although the above embodiments use two MOS tubes, those skilled in the art should understand that the MOS tubes can be replaced by other types of switching tubes, and the number of switching tubes is not limited. For two, in other embodiments, an appropriate number of switches can be selected based on the required transmit power and supply voltage. Moreover, the parameters of the selected switch tube are preferably the same, and the current of the plurality of switch tubes is not caused to cause damage to the switch tube. In addition, the number of microstrip lines after the combination can be selected from other numbers, preferably more than three, which improves the efficiency of the final stage power amplifier.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

A transceiver system for a wireless mobile communication terminal, comprising: a plurality of cascaded power amplifiers and a transceiver connected to the final stage power amplifier, the final stage power amplifier comprising:

a power splitter, wherein an input end of the power splitter is connected to an output end of the power amplifier of the previous stage;

a combiner, the output of the combiner being connected to an input end of the transceiver;

At least two switch tubes, wherein the control end of each switch tube is connected to one of the output ends of the splitter, and the first end of each switch tube is connected to one of the input ends of the combiner, and each switch tube The second end is connected to the reference ground, and the first end of each switch tube is connected to the output pin of the battery through an inductor.
The transceiver system of the wireless mobile communication terminal according to claim 1, wherein the final stage power amplifier further comprises: a plurality of combined microstrip lines and a combined pre-strip microstrip corresponding to each of the switch tubes a line, the pre-combination microstrip line is connected between the first end of the corresponding switch tube and the corresponding input end of the combiner, and the plurality of combined microstrip lines are sequentially connected to the combiner Between the output end and the input end of the transceiver, wherein the carrier impedance of the output signal of the combiner and the impedance of the plurality of combined microstrip lines are stepped .
The transceiver system of the wireless mobile communication terminal according to claim 2, wherein the number of the combined microstrip lines is greater than three.
The transceiver system of the wireless mobile communication terminal according to claim 2, wherein the final stage power amplifier further comprises at least one capacitor, one end of the capacitor is connected to the reference ground, and the other end is connected to the plurality of combined circuits. The corresponding microstrip line in the post microstrip line.
The transceiver system of a wireless mobile communication terminal according to claim 1, wherein said final stage power amplifier further comprises a first match corresponding to each of the switch tubes for matching the carrier impedance of the corresponding switch input signal a circuit, the first matching circuit being coupled between a respective output of the power splitter and a control end of the corresponding switch.
The transceiver system of the wireless mobile communication terminal according to claim 1, wherein the final stage power amplifier further comprises a bias adjustment circuit corresponding to each of the switch tubes and configured to adjust a bias voltage of the corresponding switch tube The output end of the bias voltage adjustment circuit is connected to the control end of the corresponding switch tube.
The transceiver system of a wireless mobile communication terminal according to claim 1, wherein the metal heat sink or the graphite heat sink is connected to the reference ground.
The transceiver system of a wireless mobile communication terminal according to claim 1, wherein said transceiver system further comprises a second matching circuit for matching a carrier impedance of said last stage power amplifier input signal, said second matching A circuit is coupled between the output of the preceding stage power amplifier and the input of the final stage power amplifier.
The transceiver system of a wireless mobile communication terminal according to claim 1, wherein said transceiver system further comprises a third matching circuit for matching a carrier impedance of said transceiver input signal, said third matching circuit being connected Between the output of the final stage power amplifier and the input of the transceiver .
A wireless mobile communication terminal, comprising the transceiver system according to any one of claims 1-9.