TWI229536B - Method for correcting a mobile telephone having an automatic power control function and a correction system thereof - Google Patents

Abstract

A method for correcting a mobile telephone having an automatic power control function and a correction system thereof. I control values of DAC (digital-to-analog conversion) for determining I output powers are stored in the mobile telephone. First, K control values of DAC for test are arbitrarily selected, and the K outputs of power for test of the mobile telephone corresponding to the selected DAC values for test are measured. Next, a main output power function is determined according to the K values of DAC for test and the K outputs of power for test. Then, I corrected control values of DAC corresponding to I normal outputs of power and satisfying a communication specification are obtained according to a main output power function. Thereafter, the original I control values of DAC are replaced with the I corrected control values of DAC, and the I corrected control values of DAC are stored in the mobile telephone.

Description

1229536 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a calibration method and a calibration system, and more particularly to a calibration method and a calibration system for a mobile phone with an automatic energy control function. [Prior art] Please refer to FIG. 1 ', which shows a schematic diagram of a conventional production line ι〇〇 for performing radio frequency (RF) calibration. The general mobile phone production and calibration process is as follows. First, in the circuit board component stage 102, the main components of the mobile phone are fixed on the circuit board. This main component includes a device under test (DUT), such as an RF antenna. Next, in the rf correction station 104, the output power of the RF antenna is corrected. If the output power of the rf antenna does not meet the communication specifications, such as the European Telecommunications Standards Institute (ETSI) Power Control Specification, the circuit board will be sent to an RF repair trim station outside the production line 100 108; If the output power of the RF antenna meets the communication specifications, this circuit board will be sent to the RF final test station 106. In the RF repair fine-tuning station 108, the circuit board will be repaired and the output power of the RF antenna will be fine-tuned. If the repair is successful, the board will be sent to the RF final test station 106, otherwise, the board will be classified as defective. In the RF final test station 106, the circuit board will be assembled in the mobile phone first, and then the mobile phone will be subjected to the final final test. If the mobile phone passes the final test, the mobile phone is good, otherwise it is not

TW1211F-C (HTC) .ptd Page 4 1229536 V. Description of the invention (2) Good product. In the GSM system, each time division multiple access (TDMA) code frame is divided into several time slots, and each time slot is called a burst. Please refer to Figure 2A, which shows the structure of the pulse group power versus time. Each burst can be divided into three parts: a ramp up portion 202, a burst portion 204, and a ramp down portion 206. In ETSI, the power of the pulse group section 204 can have 32 power levels (ρ ω w r r 1 e v e 1). The 32 power levels are controlled by 32 power control levels. Please refer to Figure 2B ', which is a comparison table between the 32 power control levels of the GSM400 / GSM900 / GSM850 system and the normal output power of the mobile phone. In Figure 2B, the general value (normai) and the maximum value (ext reme) of the tolerance of the output power rating are further shown. When the mobile phone has the function of Automatic Power Control (APC), the base station will instruct the mobile phone to automatically adjust the transmission power of its wireless signal according to the condition of the received wireless signal. That is, the mobile phone automatically selects different power control levels based on the distance from the base station to generate the appropriate output power to communicate with the base station. Please refer to Fig. 3 ', which shows a block diagram of a part of a system of a mobile phone used to generate the pulse group shown in Fig. 2a. Random-Access Memory (RAM) 302 stores multiple sets of characters (words). The multiple sets of characters pass through the pulse shaper 304.

TW1211F-C (HTC) .Ptd Page 5 1229536 V. Description of the invention (3) After processing ', the voltage of the upper slope 202 and the lower slope 206 corresponding to the pulse group in Fig. 2A is generated. And digital analog conversion (Digital ΐ0 AnaUg

Conversion (DAC) control value register 30 6 series stores 32 DAC control values (DAC control vaiue) corresponding to 32 power control stages. The power level converter 308 is used to select one of the 32 DAC control values stored in the DAC control value register 306 and generate a corresponding voltage. The output voltage of the pulse shaper 3 0 4 is multiplied by the output voltage of the power level converter 308 and the signal processed by the power amplifier 3 10 will control the rf antenna 312 so that the RF antenna 31 2 Generates output power corresponding to the selected DAC control value. However, due to different models of mobile phones, the D A C control values corresponding to 32 output powers are different. Furthermore, due to process differences, the same DAC control value may produce different output powers even for two mobile phones of the same model. Please refer to FIG. 4, which shows the characteristic curves 40 2 and 40 4 corresponding to the two mobile phones, respectively. Even if the DAC control value is D (a), the output power of the two mobile phones will be PL (a) and PL (b), respectively. Therefore, in the manufacturing process, calibration must be performed in the rf calibration station 104 shown in Fig. 1. Traditionally, a try and error method is used to adjust various parameters in a mobile phone so that the output power of the mobile phone conforms to the communication specifications. If the calibration cannot be performed successfully, it is often necessary to perform repair and fine-tuning in the RF repair fine-tuning station 108 outside the production line. However, the traditional correction method is very time-consuming and the yield is not high. [Summary of the Invention]

TW1211F-C (HTC) .ptd Page 6 1229536 V. Description of the Invention (4) ^ f In view of this, the purpose of the present invention is to provide a method for calibrating a mobile phone with an automatic energy control function and a calibration system thereof. The invention can achieve the purpose of quickly completing the calibration, and has the advantage of greatly improving the product yield. According to the purpose of the present invention, a method for calibrating a mobile phone with an automatic energy control function is proposed, which is used to correct the output power of an antenna corresponding to one of the power control stages of a mobile phone Integer. The mobile phone stores j digital analog conversion (D AC) control values, and one DAC control value is used to determine j output powers. The calibration method of the present invention includes: first, arbitrarily select K test dAC control values, and measure κ test output power corresponding to a test DAC value of a mobile phone test, where κ is a positive integer less than 1. Then, according to the κ test dac value and κ test test: output: rate, determine-the main output power function. Then, according to the main output power function, one corrected DAC control value corresponding to one output power rating is obtained. Among them, the one output power rating meets the requirements of a communication regulation. After that, take the Ac value of one corrected DAC control value and store it in the mobile phone. Control = another object of the present invention is to provide a calibration system for calibrating a mobile phone with self-control function, which is used to perform a power output of a mobile phone corresponding to I = control level Correct two positive integers. The mobile phone is stored with a digital analog conversion = Λ system value, and a DAC control value is used to determine an output power. The original system includes a wireless signal measurement device and a host. I wish to say that $ testing i is using w to measure the output power rate of mobile phones:

TW1211F-C (HTC) .ptd Page 7 1229536 V. Description of the invention (5) The machine is used to calibrate the mobile phone and is electrically coupled with the wireless signal measuring device. The host and the wireless signal measurement device perform the following steps to calibrate the mobile phone: first, the host selects K control DAC control values, and then the wireless signal measurement device measures the mobile phones corresponding to the K DAC values. K test output power, K is a positive integer less than 1. Then, the host determines a main output power function based on the K D A C values and the K output powers. Then, the host obtains one corrected DAC control value corresponding to one output power rating value according to the main output power function. Among them, the one output power rating value complies with a communication specification. After that, the host replaces one corrected DAC control value with one DAC control value and stores it in the mobile phone. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings to describe in detail as follows: [Embodiment] Two of FIG. 4 The characteristic curve of the mobile phone's output power versus the DAC control value can be seen. Although each mobile phone system has a different characteristic curve, the characteristic curves of the knives are quite similar. The present invention uses a main output power function to represent the characteristic curve of each mobile phone, and uses this main output power function to obtain a suitable DAC control value to quickly complete the corrective action and improve product yield. > Month 4 ..., FIG. 5 shows a block diagram of a calibration system for a mobile phone with an automatic energy control function according to a preferred embodiment of the present invention

1229536 V. Description of the invention (6) ® The calibration system 5 of the present invention includes a wireless signal measuring device 5 0 2 ”host 5 0 4. The calibration system 5 0 0 is used for a mobile phone 5 0 6! The output power of the heart antenna 312 corresponding to each power control level (power cntr01 level) is corrected, where I is a positive integer. In the ETSI power control specification, the value is 32. Action The DAC control value register 30 of the telephone 5 06 is stored with a number of digital analog conversion (DAC) control values. This I DAC control value is used to determine an output power. The wireless signal measuring device 5 0 2 is used to measure the output power of the mobile phone 506. The host 504 is provided with an RF calibration software system for calibrating the mobile phone 506 'to calibrate the mobile phone 506 and receive from Measurement result of wireless signal measuring device 502. Please refer to FIG. 6, which shows a flowchart of a first calibration method performed by the calibration system of FIG. 5. When performing calibration, first execute step 6 0 2, host 5 0 4 optional 1 (test for 08 (: control The output value is 0 (1) ~ 0 (10, and then the wireless signal measuring device 502 measures the K test outputs of the K mobile phone corresponding to the K DAC values D (1) ~ D (K). Power phy (I) ~ PHY (K), K is a positive integer less than I. That is, please refer to Figure 3, the power level converter 30 8 series respectively for these K DAC values D (l) ~ D (K) performs processing so that the RF antenna 312 outputs K corresponding output powers PHY (l) ~ PHY (K). Then, the wireless signal measuring device 502 measures the K output powers of the RF antenna 312 to Obtain K test output powers PHY (l) ~ PHY (K) and record them in the host 504. The K DAC control values for the test may be selected from the DAC control values originally stored in the mobile phone 506 Among the I DAC control values in the register, K DAC control values.

TW1211F-C (HTC) .ptd Page 9 1229536 V. Description of the invention (7) Next, step 604 is executed, the host 50 04 according to the K test DAC values D (1) ~ D (K) and K test outputs The power PHY (l) ~ PHY (K) determines a main output power function P (x). The main output power function p (x) can be a polynomial function, which can be expressed as: P (x) = ar * xr + arM * x Bu 1 +… + ai * x + a〇 (Equation 1) where x represents DAC control value, r is a positive integer. By making χ equal to D (l) ~ D (K), and P (x) equal to PHY (l) ~ PHY (K), respectively, the coefficient of the polynomial function ~ a0 can be obtained. After that, the process proceeds to step 606. The host 504 obtains one output power rating value N (1) ~ N (I) corresponding to the corrected DAC control value CD (1) ~ according to the main output power function P (χ). CD (I). Among them, I output power ratings N (1) ~ N (I) are in compliance with communication specifications, such as those of ETSI power control specifications. I output power ratings are, for example, 32 output power ratings corresponding to the 32 power control levels shown in Figure 2B. Some of the power control levels correspond to the same output power rating. value. In step 6 0 6, P (x) = N (l) can be preliminarily calculated, and the value of χ can be obtained. This value of χ is equal to CD (1). Then, let P (x) = N (2), N (3) ... N (I) in order, and obtain the value of χ, respectively, and CD (2) ~ CD (I) can be obtained. After that, perform step 6 0 8 and refer to Figure 3 at the same time to verify (ver i fy) when the power level converter 3 0 8 of the mobile phone 5 6 reads the I corrected DAC control value CD (1). ~ CD (I), so that when RF antenna 312 sends out a wireless signal, is the output power of this wireless signal PW (1) ~ PW (I) different from I output power rating N (1) ~ N (I ), That is, determine whether PW (1) ~ PW (I) are close to N (l) ~ N (I), and the difference is less than the output power.

TW1211F-C (HTC) .ptd Page 10 1229536 V. Description of the invention (8) --- Tolerance value of rate rating. If so, it means that this I corrected DAC control value CD (1) ~ CD (I) can make the round power of the wireless signal transmitted by the mobile phone 506 meet the requirements of the communication agreement. At this time, step 6 丨 〇 can be executed next. The host 504 replaces one DAC control value originally stored in the DAC control value register 3 06 with one corrected DAC control value CD (1) ~ CD (I). The values D (l) ~ D (I) are stored in the DAC control value register 3306 of the mobile phone. If the output power PW (1) ~ PW (I) and output power rating N (l) ~ n (I) corresponding to any of the I corrected DAC control values CD (1) ~ CD (I) ), The second calibration method of the present invention can be used for fine adjustment. In addition, to make the correction more accurate, the second correction method of the present invention can also be used to achieve it. Please refer to FIG. 7, which shows a flowchart of the second calibration method of the present invention. Steps 702 to 708 are the same as steps 602 to 608 respectively, and will not be repeated here. After step 708, it proceeds to step 710 to determine whether to perform fine adjustment. The judgment method is as follows, assuming that the j-th corrected DAC control value CD (j) is one of the I-corrected DAC control value CD (1) ~ CD (I), and when the j-th corrected DAC control value is determined When the j-th output power PW (j) corresponding to CD (j) does not match the j-th output power rating N (j), fine adjustment can be performed, and the process proceeds to step 7 1 2. Otherwise, go to step 7 1 4. In step 712, fine adjustment is performed. The fine-tuning method includes: First, the host 504 decides one based on the j-th corrected DAc control value CD (j), the j-th output power PW (j), and the j-th output power rating n (j). Fine-tune the output power function Pf (x). The fine-tuned output power function Pf (x) can be a polynomial function, which can be expressed as:

TW1211F-C (HTC) .ptd Page 11 1229536 V. Description of Invention (9)-

Pf (x) = bs * xs + Dxs-1 + ··· + bjx + b. (Equation 2) where the coefficient can be obtained by setting x = CD (j), pf (x) = pw (j), and using the j-th output power rating N (j). The value of s is less than the value of r. This is because the fine-tuned output power function P f (X) has the characteristic curve locality, so Pf (x) can use a polynomial of a smaller power to approximate the vicinity of the j-th corrected DAC control value CD (j). Characteristic curve. Then, the host 504 obtains the j-th fine-tuned DAC control value FD (j) by fine-tuning the output power function p f (x) and according to the j-th output power rating N (j). That is, by making Pf (x) = N (j), X is solved, and the value of this X is the desired j-th fine-tuned DAC control value FD (j). Then proceed to step 71 4. _ In step 714, the host 504 replaces the j-th fine-tuned DAC control value FD (j) in place of the j-th corrected DAC control value CD (j) and stores it in the DAC control value register 306 of the mobile phone. The other corrected DAC control values are also stored in the DAC control value register 30 6 of the mobile phone. · In addition, in step 710, even all the corrected DAC control values CD. (1) ~ CD (I) corresponding output power pw (l) ~ PW (I) and output power rating N (1) When ~ N (I) all agree, fine adjustment can still be performed to obtain more accurate fine-tuned DAC control values FD (1) ~ FD (I). Assuming that the j-th output power PW (j) corresponding to the j-th corrected DAC control value CD (j) is closer to the j-th output power rating N (j), perform step 7 1 2. Make fine adjustments. Similarly, the above-mentioned fine-tuning method can be used to obtain the j-th fine-tuned DAC control value FD (j) °. Then, the process proceeds to step 714, and the host 504 replaces the j-th fine-tuned DAC control value FD (j). The first] DAC control value CD (j) after correction is stored in the DAC control value register 30 of the mobile phone.

TW1211F-C (HTC) .ptd Page 12 1229536 V. Description of the Invention (10) The second correction method of the present invention is described as an example. Please refer to FIG. 8A to FIG. 8C, which are examples of the function curves of the main output power function ρ (χ) and the fine-tuned output power function Pf (x) when implementing the second correction method of the present invention. It is assumed that K = 4, and 1 = 32. After performing steps 702 and 704, the four test DAC control values D (l) to D (4) and the four test output powers measured by the wireless signal measuring device 502 are PHY (1) to PHY. (4) The main output power function P, (χ) is determined, as shown in Figure 8A. When step 70 6 is performed, the host 5 04 calculates 32 corrections from 32 output power ratings N (1) to N (32) according to the main output power function P, (X)]) AC control value CD (1) to CD (32) are shown in FIG. 8B, where FIG. 8B only shows 6 sets of output power ratings and DAC control values after correction. After the fine-tuning steps of step 7 1 2 are performed, the host 5 〇 according to the j-th corrected DAC control value CD (j), the j-th output power pW (j), and the j-th output power rating N ( j) to obtain the fine-tuned output power function pf, (χ). Then, the host 504 obtains the j-th fine-tuned DA (: control value FD () ·) by the fine-tuning output power function ργ (χ) according to the output power rating N (j) of the first round. The ^ -th fine-tuning The post-DAC control value FD (j) and other corrected DAC control values will be stored in the DAC control value register 3506 of the mobile phone to complete the correction. The corrected mobile phone will accurately transmit conforming communications The output power of each of the agreed power control stages. Please refer to FIG. 9, which shows a schematic diagram of a production line 900 for performing RF calibration of the present invention. The production and calibration process using the calibration method and system of the present invention is as follows. First, The main components of the mobile phone are fixed on the circuit board in the circuit handle-electric tower configuration part 902. Then, the RF calibration

HII surface TW1211F-C (HTC) .ptd Page 13 1229536 V. Description of the invention (11)

In Zhenghe R F repair fine-tuning station 900, the calibration system 500 of the present invention performs the first calibration method or the second calibration method to calibrate the mobile phone 506. If the calibration fails, the mobile phone 506 is a defective product; if the calibration is successful, the mobile phone 906 is sent to the RF final test station 106 to perform an overall test on the entire mobile phone 506. W The present invention can complete the calibration and fine-tuning operations in the RF calibration and RF repair fine-tuning station 904. It is not necessary to take the circuit board out of the production line for repair and fine-tuning as in the traditional method shown in Figure 1. Moreover, since the present invention can obtain all the corrected DAC control values and fine-tuned DAC control values only by measuring several test output powers, the present invention has the advantage of completing the correction quickly. After the application of the present invention to a production line, the results of practical application show that because the accuracy of the DAC control value stored in the DAC control value register 306 after correction is improved, the product yield is also greatly increased. In summary, as mentioned above, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Anyone skilled in this art should not deviate from the spirit and scope of the present invention. Make all kinds of changes and retouching, so the scope of protection of this Maoming shall be defined as the scope of the attached patent application as

TW1211F-C (HTC) .ptd

1229536 Schematic description [Schematic description] Figure 1 shows the traditional production line for RF calibration; Figure 2A shows the structure of pulse group power versus time; Figure 2B is GSM4 0 0 / GSM9 Comparison table between the 32 power control levels of the 0 0 / GSM85 0 system and the output power rating of the mobile phone; Figure 3 shows a block diagram of a part of the system of a mobile phone used to generate the pulse group shown in Figure 2 Figure 4 shows a characteristic curve corresponding to two mobile phones; Figure 5 shows a block diagram of a calibration system for calibrating a mobile phone with an automatic energy control function according to a preferred embodiment of the present invention; Figure 6 shows Figure 5 is a flowchart of the first calibration method performed by the calibration system of Figure 5, Figure 7 is a flowchart of the second calibration method of the present invention; Figures 8A to 8C are diagrams illustrating the implementation of the present invention. An example of the function curve of the main output power function P (x) and the fine-tuned output power function Pf (x) in the second correction method; intention. Explanation of drawing symbols 100, 900: Production line 1 0 2, 9 0 2: Circuit board component configuration station 1 04: RF correction station 1 0 6, 9 0 6: R F final test station

TW1211F-C (HTC) .ptd Page 15 1229536 Brief description of the diagram 108 202 204 206 302 304 306 308 310 312 402 500 502 504 506 602 904: RF repair fine-tuning station: upper slope part: pulse group part: lower slope part : Random access memory: Pulse shaper: DAC control value register: Power level converter: Power amplifier: RF antenna, 4 0 4: Characteristic curve correction system Wireless signal measuring device Host mobile phone 6 1 0, 7 0 2 ~ 7 1 4: Process steps: RF calibration and RF repair fine-tuning station

TW1211F-C (HTC), ptd Page 16

Claims (1)

1229536 6. Scope of patent application 1. A method for calibrating a mobile phone with Automatic Power Control (APC) function, which is used to correspond to a power control level (p0wer control level) of a mobile phone. The output power of an antenna is corrected. I is a positive integer. The mobile phone stores I digital analog conversion (DAC) control values. The I DAC control values are used to determine the I output power. Power, the calibration method includes: (a) optional K test D AC control values, and measure the κ test output power of the mobile phone corresponding to the κ test DAC values, where κ is less than 1 A positive integer; (b) determining a main output power function based on the K test DAC values and the K test output power; (c) obtaining an output power rating corresponding to the main output power function One corrected DAC control value, wherein the one output power rated value complies with a communication specification; and (d) the one corrected dAC control value is substituted for the one dAc control value and stored in the The bank Phone. 2. The method according to item 1 of the scope of patent application, wherein the main output power function is a polynomial function, and in step (b), according to the K test DAC values and the K test outputs Power determines all coefficients of the polynomial function. 3. Method as described in item 1 of the scope of patent application 'wherein the κ control DAC control value is selected from the 1) person (: control value. 4. As described in item 1 of the scope of patent application Method 'in which step 1229536 VI. Between patent application scope (c) and step (d), the following steps are further included: (C 1) Verification When the mobile phone reads the I corrected DAC control value, When the antenna sends out a wireless signal, whether the output power of the wireless signal is consistent with the output power ratings, and if so, step (d) is performed. 5. The method according to item 4 of the scope of patent application, wherein after step (c 1), it further comprises: (c 2) when a j-th correction corresponds to one of the j-th output power of the d AC control value When it does not match a j-th output power rating, step (c3) is performed, where the j-th corrected DAC control value is one of the I-corrected DAC control value; and (c 3) according to the first j corrected DAC control values, the j-th output power, and the j-th output power rating determine a fine-tuned output power function; and (c 4) by the fine-tuned output power function, according to the j-th output The power rating value obtains a j-th fine-tuned DAC control value; and in step (d), the j-th fine-tuned DAC control value replaces the j-th fine-tuned DAC control value and is stored in the mobile phone. in. 6 · The method as described in item 4 of the scope of patent application, wherein after step (c 1), it further comprises: (c2) when a j-th output power corresponding to a j-th corrected DAC control value is to be made When closer to a j-th output power rating, step (c3) is performed, wherein the j-th corrected DAC control value is one of the I-corrected DAC control values; and TW1211F-C (HTC) .ptd Page 18 1229536 6. The scope of patent application (C 3) is determined based on the j-th corrected DAC control value, the j-th output power and the j-th output power rating. A trimmed output power function; and (c 4) using the trimmed output power function to obtain a j-th fine-tuned DAC control value based on the j-th output power rating; and in step (d), the first The j fine-tuned DAC control values replace the j-th corrected DAC control value and are stored in the mobile phone. 7. —A calibration system for calibrating a mobile phone with an automatic energy control function, which is used to adjust the output power of one antenna corresponding to one power control level of a mobile phone (〇utpui: power) for correction, I is a positive integer, the mobile phone stores ^ fixed digital analog conversion (DAC) control value, the I DAC control value is used to determine the i output power, the correction system includes: a wireless A signal measuring device for measuring the output power transmitted by the mobile phone; and a host 'for calibrating the mobile phone and electrically coupled with the wireless signal measuring device; wherein the host and the wireless signal The measurement device performs the following steps to calibrate the mobile phone: K test output powers, κ is a positive integer less than I; Once (a) the host selects κ test DAC control values, and then the wireless communication tester I sets and measures the κ test DAC value corresponding to the mobile phone. (B) The host according to the κ Test DAC values and the κ test output Page 19