TWI395455B - A mobile phone with maximum power correction - Google Patents

Description

A mobile phone with maximum power correction

The present invention relates to a mobile device, and more particularly to a mobile phone with maximum power correction.

Mobile phones, such as mobile phones, look up their internal stored power correction tables in a conducted mode and a radiated mode to output maximum power so that they can pass the verification of the relevant standards organization before leaving the factory. And can also automatically adjust the maximum power output during the user's call.

Generally, the above power correction table (shown in FIG. 1) is established in a wired mode, which is tested and corrected by a base station tester, and stored in a memory of the mobile phone, so that the mobile phone is in both modes. Query this table to output the maximum power.

The maximum power correction table of FIG. 1 includes the maximum power value of the wired mode corresponding to the 16 different channels of 0-15, and the maximum power value of the wireless radiation mode. It can be seen that the maximum power measured by the mobile phone in the wireless radiation mode using the antenna test room or the microwave darkroom is 19, and the minimum value is 17.1, and the measurement error is large. In other words, if the mobile phone is in test mode (which corresponds to the wired mode), its maximum power output according to the table of Figure 1 is higher, and the error is smaller (0.6); conversely, if the mobile phone is in the call mode (the corresponding wireless Radiation mode), which has a lower maximum power accuracy and a larger error (1.9) according to the table of Figure 1. Therefore, in this case, the mobile phone cannot accurately output the maximum power value in different modes.

In view of this, it is necessary to provide a mobile phone with maximum power correction, which has two modes of power. The calibration table allows the mobile phone to find the corresponding table in different modes to achieve accurate output power.

A mobile phone with maximum power correction in a specific embodiment of the present invention, which utilizes a base station tester or a microwave darkroom for maximum power correction, including a radio frequency chip, a power amplifier, a coupler, a duplexer, a test connector, Power detector, central processing unit (CPU), high level hold circuit and detection circuit. The RF chip transmits and receives RF signals through a RF front-end circuit formed by a power amplifier, a coupler, a duplexer, and an antenna, and the power detector detects the RF signal power output by the power amplifier through the coupler, and converts the power to the voltage output to The CPU, the base station tester is coupled to the RF front-end circuit through the test connector, and measures the power of the mobile phone in the test mode and outputs it to the CPU, and the microwave darkroom measures the power of the mobile phone in the working mode. A high level hold circuit is coupled to the test connector for providing a high level signal. The detecting circuit is connected between the test connector and the CPU, and is used for detecting the connection status between the base station tester and the test connector, and outputting the high level signal to the CPU according to the connection condition. The CPU determines the current mode of the mobile phone according to the output signal of the detecting circuit, and searches for a pre-established test mode power correction table or a working mode power correction table to output the maximum power.

In the present invention, the mobile phone establishes a test mode power correction table and an operation mode power correction table in the power calibration process, and stores them in the internal memory. After the mobile phone calibration is completed, it can use the high-level hold circuit and the detection circuit to determine the current mode, and find the corresponding power correction table to output the maximum power, so that the output power of the mobile phone in different modes is more accurate.

10‧‧‧Mobile Phone

100‧‧‧RF chip

110‧‧‧Power Amplifier

120‧‧‧ Coupler

130‧‧‧Duplexer

140‧‧‧Test connector

C1, C2, C3‧‧‧ capacitors

150‧‧‧Power detector

160‧‧‧CPU

170‧‧‧Detection circuit

180‧‧‧High level hold circuit

20‧‧‧Base station tester

30‧‧‧Antenna

R1, R2‧‧‧ resistance

Figure 1 shows the existing maximum power correction table; Figure 2 shows the internal module of the mobile phone of the present invention; 3 is a specific connection relationship of the high-level holding circuit, the test connector, and the detecting circuit of FIG. 2 according to the present invention; FIG. 4 is a maximum power correction table in the test mode of the present invention; and FIG. The maximum power correction table in the inventive mode of operation.

2 is an internal module diagram of a mobile phone (mobile phone) 10 of the present invention, which utilizes a base station tester 20 or an antenna laboratory or a microwave darkroom (not shown) for maximum power correction, including a radio frequency chip 100, a power amplifier. 110, coupler 120, duplexer 130, test connector 140, power detector 150, central processing unit (CPU) 160, detection circuit 170, and high level hold circuit 180. In the embodiment, the RF chip 100 transmits and receives RF signals through the RF front-end circuit formed by the power amplifier 110, the coupler 120, the duplexer 130, and the antenna 30, and the mobile phone 10 includes two modes: a wired mode (test mode) and Wireless radiation mode (operating mode).

The RF chip 100 outputs an RF signal to the power amplifier 110. Power amplifier 110 amplifies the power of the RF signal and is coupled to power detector 150 via coupler 120. The power detector 150 converts the amplified RF signal into a voltage signal and outputs it to the CPU 160. At the same time, the power amplifier 110 transmits the amplified RF signal through the duplexer 130 and the test connector 140 either through the antenna 30 or to the base station tester 20. The high level hold circuit 180 is connected to the test connector 140 for continuously outputting a high level. The detecting circuit 170 is connected between the test connector 140 and the CPU 160 for detecting the connection status between the base station tester 20 and the test connector 140, and receiving the high level signal according to the connection condition and outputting to the CPU 160. .

In the test mode, the power outputted by the power amplifier 110 is measured by the base station tester 20 and transmitted to the CPU 160, and the CPU 160 establishes a test mode power correction table based on the received power and voltage ( As shown in Figure 4). In the working mode, the antenna power or the microwave darkroom is used to measure the radiation power of the antenna 30, and the test mode power correction table is manually corrected according to the measured power level to become the working mode power correction table (as shown in FIG. 5) and stored. In the mobile phone 10, the specific modification manner is described in FIG.

When the mobile phone 10 determines whether the mobile phone 10 is in the test mode or the working mode according to the signal outputted by the detecting circuit 170 after the calibration is completed, and according to the pre-established test mode power correction table and the working mode power correction table to output the maximum power.

In this embodiment, during the power calibration test of the mobile phone 10, the test mode and the work mode power correction table have been established and stored therein, and when the mobile phone 10 completes the power calibration and is verified or used before leaving the factory, the CPU 160 determines the mobile phone. 10 is currently in the state, and finds the corresponding power correction table to output the maximum power. Specifically, when the base station tester 20 is determined to be connected to the test connector 140, the test connector 140 disconnects the detection circuit 170 from the high level hold circuit 180, and the detection circuit 170 fails to receive the high level. The signal, therefore, does not output a high level signal to the CPU 160, so that the CPU 160 determines that the mobile phone 10 is in the test mode. At this time, the mobile phone 10 outputs the maximum power according to the test mode power correction table. When the base station tester 20 is disconnected from the test connector 140, the test connector 140 turns on the connection of the detection circuit 170 to the high level hold circuit 180, and the detection circuit 170 receives the high level signal and outputs To the CPU 160, the CPU 160 determines that the handset 10 is in the active mode and outputs the maximum power according to the operating mode power correction table.

FIG. 3 is a specific circuit diagram of the high level holding circuit 180, the test connector 140, and the detecting circuit 170 of the present invention. The test connector 140 has at least four pins. In this embodiment, there are six pins. The pin 1 is an input end of the test connector 140, and is connected to the base station tester 20 or the antenna 30. Pin 2 is the output of test connector 140, which is coupled to high level hold circuit 180 and duplexer 130; the remaining pins 3-6 are grounded. In the present embodiment, the high level holding circuit 180 includes one isolation element R1 and two capacitances C1, C2. Wherein, the isolation element R1 is a resistor, and the other In the embodiment, it may also be an inductor or other high impedance component with isolation function. Capacitors C1 and C2 are connected in parallel between the high voltage signal input terminal Vin and ground for filtering. The resistor R1 is connected between the high voltage signal output terminal Vin and the pin 2 of the test connector 140 for isolating the RF signal. The detecting circuit 170 includes another isolation element R2 and a capacitor C3. Similarly, the isolation element R2 is a resistor. In other embodiments, the inductor or other high-impedance element having an isolation function may also be used. The resistor R2 is connected between the pin 1 of the test connector 140 and the CPU 160 for isolating the RF signal. One end of the capacitor C3 is connected between the resistor R2 and the CPU 160, and the other end is grounded for filtering.

In the embodiment, when the test connector 140 is in a normal state (not connected to the base station tester 20), the pin 1 is connected to the pin 2, and the high level hold circuit 180 is maintained through the test connector 140 and the detecting circuit 170. In the path, the CPU 160 receives the high level signal, thereby determining that the mobile phone 10 is currently in the test mode. When the base station tester 20 is inserted into the pin 2 of the test connector 140, the spring between the pins 1 and 2 is bounced, so that the high level holding circuit 180 and the detecting circuit 170 are in an off state, and the CPU 160 receives The low level signal determines that the mobile phone 10 is in the working mode.

FIG. 4 shows a voltage and power comparison table corresponding to the 16 different channels of the mobile phone 10 in the test mode. In the present embodiment, in the test mode, the base station tester 20 is connected to the test connector 140 for measuring the output power of the power amplifier 110. The test mode power correction table includes a channel field bit, a voltage field bit, and a power field. Each power value in the power field is the output power value of the base station tester 20 measuring the power amplifier 110. The maximum output power of the mobile phone 10 in the test mode is preset to 24.5, and then the base station tester 20 needs to measure the power of 24.5. In the embodiment, the error is not more than ±0.3. Generally, in an ideal state, the power measured by the base station tester 20 is substantially equal to the output power of the power amplifier 110, and thus the output power of the power amplifier 110 is adjusted according to the power measured by the base station tester 20 to satisfy the mobile phone 10 Maximum power in test mode. It can be seen from Figure 4 that the power maximum in the test mode power field is 24.8, the minimum is 24.2, and the variation is only 0.6. Correspondingly, according to each test The power detector 150 also corresponds to the output voltage value. Similarly, the converted voltage of the power detector 150 should theoretically be substantially the same, but the deviation of the power measured by the base station tester 20 may cause a deviation in the output voltage of the power detector 150. Therefore, the voltage value in the test mode voltage field in Figure 4 will also fluctuate. In this way, the maximum power meter of the test mode establishes a one-to-one correspondence between the voltage of the different channels and the maximum power value of the mobile phone 10 in the test mode. In the present embodiment, the voltage and power values shown in FIG. 4 are values obtained by the CPU 160 after the actual voltage and power received, which represent the actual voltage and power values.

FIG. 5 shows a voltage and power comparison table corresponding to the 16 different channels of the mobile phone 10 in the working mode. In this embodiment, in the working mode, the base station tester 20 is disconnected from the test connector 140, and the output power of the mobile phone 10 is radiated to the antenna laboratory or the microwave darkroom through the antenna 30 for measurement. Similarly, the operating mode power correction table includes a channel field bit, a voltage field bit, and a power field. Wherein, each power of the power field is obtained by: in the working mode, first fixing the output of the power amplifier 110 to the maximum power in the test mode (24.5±0.3), and then measuring the power radiated by the antenna 30 by using the microwave darkroom. The size, the measured maximum power is selected, and the output of the power amplifier 110 is adjusted to adjust the measured non-maximum power value to be close to the measured maximum power value.

Specifically, since the error radiated by the antenna 30 is greater than the error measured by the base station tester 20, the power measured in the antenna laboratory or the microwave darkroom needs to be adjusted to the maximum, and the power amplifier 110 needs to be adjusted accordingly. The output of the antenna 30 maximizes the output power of the antenna 30. In this embodiment, when the output of the fixed power amplifier 110 is the same as the test mode maximum power 24.5, the maximum radiation power of the antenna 30 measured in the antenna laboratory or the microwave darkroom is 19, and the minimum value is 17.1, and the error is 1.9 (refer to Figure 1). It can be seen that, in the case that the output power of the power amplifier 110 is constant, the maximum radiated power of the antenna 30 is 19, which is regarded as the maximum power value of the mobile phone 10 in the working mode. Therefore, the remaining power needs to be adjusted to be close to 19.

For example, in the channel 1018, the measured antenna 30 radiated power is only 17.1, and the corresponding voltage is 194, then the voltage 194 needs to be adjusted to a certain value, for example: 200, thereby changing the output power of the power amplifier 110, so that the antenna 30 radiant power is close to 19. By analogy, the output power of the antenna 30 in each channel is adjusted to the maximum. Therefore, the test mode power correction table in FIG. 4 is manually corrected to the power correction table of the working mode in FIG. 5 and stored in the mobile phone 10, so that the mobile phone 10 establishes the voltage and maximum power value of different channels in the working mode. One-to-one correspondence. As can be seen from Figure 5, the maximum power error is only 0.5 in the operating mode.

In the present invention, the mobile phone 10 establishes a test mode power correction table and an operation mode power correction table in the power calibration process, respectively, and stores them in the internal memory. After the calibration of the mobile phone 10 is completed, the high-level holding circuit 180 and the detecting circuit 170 can be used to determine the current mode, and the corresponding power correction table outputs the maximum power, so that the output power of the mobile phone 10 in different modes is obtained. More precise.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims.

10‧‧‧Mobile Phone

100‧‧‧RF chip

110‧‧‧Power Amplifier

120‧‧‧ Coupler

130‧‧‧Duplexer

140‧‧‧Test connector

150‧‧‧Power detector

160‧‧‧CPU

170‧‧‧Detection circuit

180‧‧‧High level hold circuit

20‧‧‧Base station tester

30‧‧‧Antenna

Claims (10)

A mobile phone with maximum power correction that utilizes a base station tester and a microwave darkroom for maximum power correction, including radio frequency chips, power amplifiers, couplers, duplexers, test connectors, power detectors, and central processing A central processor unit (CPU), wherein the RF chip transmits and receives an RF signal through a RF front end circuit formed by a power amplifier, a coupler, a duplexer, and an antenna, and the power detector detects the RF output of the power amplifier through the coupler. The signal power is converted into a voltage output to the CPU. The base station tester is coupled to the RF front end circuit through the test connector, and measures the power of the mobile phone in the test mode and outputs to the CPU. The microwave darkroom operates in the working mode. Measure the power radiated by the mobile phone through the antenna, wherein the mobile phone includes: a high level holding circuit connected to the test connector for providing a high level signal; and a detecting circuit connected to the test connector Between the CPU and the CPU, for detecting the base station tester and the test connector Receiving the status and receiving the high level signal according to the connection status and transmitting to the CPU; wherein the CPU determines the current mode of the mobile phone according to the output signal of the detecting circuit, and corrects the power according to the pre-established test mode The table or operating mode power calibration table outputs the maximum power. The mobile phone according to claim 1, wherein the CPU establishes the test mode power correction table according to the power and voltage received in the test mode, and the work mode power correction table is corrected according to the test mode power correction table. . The mobile phone according to claim 1, wherein when the base station tester is connected to the test connector, the test connector disconnects the high level holding circuit from the detecting circuit, and the detecting circuit Failed to receive high level signal and cannot be transmitted to CPU, CPU judges mobile phone In the test mode, and outputting the maximum power according to the test mode power calibration table; when the base station tester disconnects from the test connector, the test connector turns on the connection between the high level hold circuit and the detection circuit, and then detects The measuring circuit receives the high level signal and transmits it to the CPU, and the CPU determines that the mobile phone is in the working mode, and outputs the maximum power according to the working mode power correction table. The mobile phone according to claim 1, wherein the test connector has at least four pins, wherein the first pin is connected to the antenna as an input end of the test connector, and the second pin serves as the The output of the connector is tested, and the remaining pins are grounded, wherein the first pin and the second pin are connected by a spring. The mobile phone of claim 4, wherein the high level holding circuit comprises a first isolation element connected between the high level signal input end and the second pin of the test connector for isolation RF signal. The mobile phone of claim 4, wherein the detecting circuit comprises a second isolation component connected between the second pin of the test connector and the ground for isolating the RF signal. The mobile phone according to claim 1, wherein the test mode power correction table and the working mode power correction table each include a channel field bit, a voltage field bit, and a power field. The mobile phone of claim 7, wherein the power value in the power field in the test mode power correction table is that the base station tester measures the output power value of the power amplifier. The mobile phone according to claim 8 , wherein the power of the power field in the working mode power calibration table is obtained by: in the working mode, first fixing the output of the power amplifier to the test mode Maximum power, then use the microwave darkroom to measure the power of the antenna radiation, select the measured maximum power, and adjust the voltage value of the power amplifier to adjust its output power value, thereby adjusting the measured non-maximum power value to the measurement The maximum power values reached are close. The mobile phone according to claim 8 of the patent application, wherein the test mode power calibration table is powered The voltage value of the voltage field is the voltage value converted by the power detector according to the output power of the power amplifier.