CN1972149A - Production calibration method and apparatus for TD-SCDMA radio frequency power amplifier - Google Patents

Abstract

This invention discloses one TD-SCDMA radio frequency amplifier production and correction method and device, wherein, it selects upper limit characteristics value in the radio power amplifier output power correction range and down value and the third characteristics value in between and corrects their relative correction point to get the above values relative automatic power control values.

Description

The production calibration steps and the device of TD-SCDMA radio-frequency power amplifier

Technical field

The present invention relates to the calibration steps and the device of power amplifier, relate in particular to a kind of production calibration steps and device of TD-SCDMA mobile phone radio-frequency power amplifier.

Background technology

The radio-frequency power amplifier of TD-SCDMA mobile phone is as the afterbody on the TD-SCDMA mobile phone transmitting chain, and major function is to amplify radiofrequency signal to certain power, thereby guarantees getting in touch between mobile phone and the base station.For the power output that guarantees each mobile phone can both satisfy in the TD-SCDMA consensus standard requirement to the power output of mobile phone, each mobile phone all will be through calibration before dispatching from the factory.In fact the calibration of TD-SCDMA radio-frequency power amplifier is exactly the power output (P that finds automated power control (APC) and power amplifier _Out) relation.After finding this relation, again according to needed power output (P _Out) calculate pairing automated power control (APC), and then finish the calibration of radio-frequency power amplifier.

Stipulate according to the TD-SCDMA agreement, the calibration range of the power output of TD-SCDMA mobile phone radio-frequency power amplifier is-50dBm～24dBm, because TD-SCDMA is higher for the required precision of radio-frequency power amplifier, calibration error requires within ± 1dB, so the calibration steps that adopt in the laboratory generally is manual pointwise calibration, manual calibration needs each point in manual calibration-50dBm～24dBm scope, comes to 75 points.In the manual pointwise calibration process, APC is to power output P _OutControl relation as shown in Figure 1: measure the power output before the calibration of radio-frequency power amplifier with the power amplifier measuring equipment, if this power output is not in-50dBm～24dBm scope, the value that then needs manual setting APC drops in the output power range of TD-SCDMA consensus standard regulation the value of this power output.Present power amplifier is because the characteristic of semiconductor technology, still there is discreteness to a certain degree, the peak power output that the discreteness of power amplifier mainly shows as each power amplifier is difference to some extent, so present manual pointwise calibration steps need be applied on the radio-frequency power amplifier of each TD-SCDMA mobile phone, and the radio-frequency power amplifier of each TD-SCDMA mobile phone needs 75 points of manual calibration.Though manual pointwise calibration is higher to the calibration accuracy of power amplifier, calibration is counted more, expends the plenty of time, and calibration speed is slow, is not suitable for producing in batches the requirement to calibration speed.Present TD-SCDMA agreement does not provide the standard calibration method of radio-frequency power amplifier, and PA (power amplifier) manufacturer does not provide the calibration steps and the corresponding device thereof of reference yet.

Summary of the invention

Problem at above-mentioned prior art exists the object of the present invention is to provide production calibration steps and the device of a kind of satisfied batch process to the TD-SCDMA radio-frequency power amplifier of very fast calibration speed requirement.

For achieving the above object, the production calibration steps of TD-SCDMA radio-frequency power amplifier of the present invention comprises the steps:

(1) in the calibration range of the power output of radio-frequency power amplifier, chooses upper limit characteristic value, the lower limit characteristic value, and the 3rd characteristic value between this upper limit characteristic value and the lower limit characteristic value, and calibrate the calibration point of their correspondences, obtain the automatic power control value of described upper limit characteristic value correspondence, the automatic power control value of described lower limit characteristic value correspondence, and the automatic power control value of described the 3rd characteristic value correspondence;

(2), utilize the curve fit formula to calibrate other calibration point except that the corresponding respectively calibration point of upper limit characteristic value, lower limit characteristic value and the 3rd characteristic value in the calibration range of power output of described radio-frequency power amplifier according to three automatic power control value that obtained in the step (1).

Wherein, described the 3rd characteristic value can be-10dbm.

Described upper limit characteristic value is 24dbm, and described lower limit characteristic value is-50dbm.

Described step (2) is specially:

(21), utilize the calibration of the first curve fit formula between the corresponding calibration point of output power value between described upper limit characteristic value and the 3rd characteristic value according to described upper limit characteristic value, lower limit characteristic value and the corresponding respectively automatic power control value of the 3rd characteristic value; Utilize second curve fit formula calibration between the corresponding calibration point of output power value between described the 3rd characteristic value and the lower limit characteristic value.

Further, described step (21) is specially:

(211) according to described upper limit characteristic value 24dBm, lower limit characteristic value-50dBm and the corresponding respectively automatic power control value of the 3rd characteristic value-10dBm, utilize the first curve fit formula:

$\mathrm{APC}=A*{(\frac{P_{\mathrm{out}}}{k_1}+B)}^2+k_2$ The calibration point of the output power value correspondence between-10dBm and 24dBm of calibrate radio frequency power amplifier;

Utilize the second curve fit formula: $\mathrm{APC}=C*\sqrt{k_3*P_{\mathrm{out}}+D}+k_4$ The calibrate radio frequency power amplifier between-50dBm and-calibration point of output power value correspondence between the 10dBm;

Wherein, P _OutBe the radio-frequency power amplifier power output of this moment, the automatic power control value of APC for calculating, A, B, C, D are self-defined constant, K ₁, K ₂, K ₃, K ₄Be the constant parameter.

Constant parameter K in the described step (211) ₁Computing formula be:

$k_1=\frac{2*A*B*(24-m)+\mathrm{\Δ}}{2*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})};$

The constant parameter K ₂Computing formula be:

$k_2={\mathrm{APC}}_{\max }-A*{(\frac{24}{k_1}+B)}^2;$

Wherein, APC _MaxAutomatic power control value for described upper limit characteristic value correspondence; APC _MidBe the automatic power control value of described the 3rd characteristic value correspondence, the computing formula of Δ is:

$\mathrm{\Δ}=\sqrt{{(2*A*B*(24-m))}^2+4*A*({24}^2-m^2)*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})},$ Wherein, A, B are self-defined constant, m=-10.

Constant parameter K in the described step (211) ₃Computing formula be:

$k_3=\frac{b+\sqrt{b^2-4*a*c}}{2*a},$

The constant parameter K ₄Computing formula be: $k_4={\mathrm{APC}}_{\mathrm{mid}}-C*\sqrt{D+m*k_3},$

Wherein, a=C ⁴* (m+50) ²

b＝2*C ²*(m-50)*((APC _mid-APC _min) ²-2*D*C ²)+4*C ⁴*(m-50)*D；

C=((APC _Mid-APC _Min) ²-2*D*C ²) ²-4*C ⁴* D ²Wherein, C, D are self-defined constant, m=-10, APC _MidBe the automatic power control value of described the 3rd characteristic value correspondence, APC _MinAutomatic power control value for described lower limit characteristic value correspondence.

Described step (2) can also comprise afterwards:

With the output power value between upper limit characteristic value and lower limit characteristic value of radio-frequency power amplifier and be stored in by the automatic power control value that output power value calculates in the fixed memory of mobile phone.

For achieving the above object, the production calibrating installation of TD-SCDMA radio-frequency power amplifier of the present invention comprises: characteristic value input unit, automated power control computation unit and automated power control output unit;

Wherein, described characteristic value input unit, be used to receive the automatic power control value that obtains through calibration in advance, described automatic power control value comprises: the automatic power control value that the upper limit characteristic value in the calibration range of the power output of radio-frequency power amplifier, lower limit characteristic value and the 3rd characteristic value are corresponding respectively;

Described automated power control computation unit, be used for according to automatic power control value from described characteristic value input unit, and the power output of each calibration point in the calibration range of the power output of radio-frequency power amplifier, calculating carries out curve fitting, obtain to remove described upper limit characteristic value, the automatic power control value of each calibration point that the calibration point of lower limit characteristic value and the 3rd characteristic value difference correspondence is outer;

Described automated power control output unit is used for the result of calculation output with described automated power control computation unit.

Further, described automated power control computation unit comprises:

The first curve fit formula computing unit, be used for the automatic power control value corresponding respectively, utilize the first curve fit formula to calculate between the corresponding automatic power control value of output power value between described upper limit characteristic value and the 3rd characteristic value according to the upper limit characteristic value of obtaining from described characteristic value input unit, the 3rd characteristic value;

The second curve fit formula computing unit, be used for the automatic power control value corresponding respectively, utilize the second curve fit formula to calculate between the corresponding automatic power control value of output power value between described the 3rd characteristic value and the lower limit characteristic value according to the 3rd characteristic value of obtaining from described characteristic value input unit, lower limit characteristic value.

Wherein, described upper limit characteristic value is 24dbm, and the 3rd characteristic value is-10dbm, and the described first curve fit formula computing unit utilizes following formula to calculate between-10dbm and the corresponding automatic power control value of output power value between the 24dbm:

$\mathrm{APC}=A*{(\frac{P_{\mathrm{out}}}{k_1}+B)}^2+k_2$

Wherein, P _OutBe the radio-frequency power amplifier power output of this moment, the automatic power control value of APC for calculating, A, B, C, D are self-defined constant, K ₁, K ₂Be the constant parameter;

The constant parameter K ₁Computing formula be: $k_1=\frac{2*A*B*(24-m)+\mathrm{\Δ}}{2*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})};$

The constant parameter K ₂Computing formula be: $k_2={\mathrm{APC}}_{\max }-A*{(\frac{24}{k_1}+B)}^2;$

Wherein, APC _MaxAutomatic power control value for described upper limit characteristic value correspondence; APC _MidBe the automatic power control value of described the 3rd characteristic value correspondence, the computing formula of Δ is:

$\mathrm{\Δ}=\sqrt{{(2*A*B*(24-m))}^2+4*A*({24}^2-m^2)*({\mathrm{APC}}_{\max }-\mathrm{AP}{C}_{\mathrm{mid}})},$ Wherein, m=-10.

Wherein, described the 3rd characteristic value is-10dbm, and the lower limit characteristic value is-50dbm, and the described second curve fit formula computing unit utilizes following formula to calculate between the corresponding automatic power control value of output power value between-50dbm and the-10dbm:

$\mathrm{APC}=C*$ $\sqrt{k_3*P_{\mathrm{out}}+D}$ $+$ $k_4$

Wherein, P _OutBe the radio-frequency power amplifier power output of this moment, the automatic power control value of APC for calculating, A, B, C, D are self-defined constant, K ₃, K ₄Be the constant parameter,

The constant parameter K ₃Computing formula be: $k_3=\frac{b+\sqrt{b^2-4*a*c}}{2*a},$

The constant parameter K ₄Computing formula be: $k_4={\mathrm{APC}}_{\mathrm{mid}}-C*\sqrt{D+m*k_3},$

Wherein, a=C ⁴* (m+50) ²

b＝2*C ²*(m-50)*((APC _mid-APC _min) ²-2*D*C ²)+4*C ⁴*(m-50)*D；

C=((APC _Mid-APC _Min) ²-2*D*C ²) ²-4*C ⁴* D ²Wherein, m=-10, APC _MidBe the automatic power control value of described the 3rd characteristic value correspondence, APC _MinAutomatic power control value for described lower limit characteristic value correspondence.

Method and apparatus provided by the present invention and manual pointwise calibration difference are that the corresponding point of each value in the output power range that need manual be aligned in the TD-SCDMA radio-frequency power amplifier is calibrated in manual pointwise, can expend a large amount of time like this.The present invention only need adopt 3 points of mode calibration in advance such as manual, be in the production calibration range of TD-SCDMA radio-frequency power amplifier-50dBm ,-point of three values correspondences of 10dBm, 24dBm, remaining value in the production calibration range of TD-SCDMA radio-frequency power amplifier adopts the mode of curve fit to calibrate, the curve fit formula that the present invention proposes to the calibration accuracy of TD-SCDMA radio-frequency power amplifier also than higher, both can satisfy the required precision of agreement regulation, saved the alignment time greatly, can satisfy the requirement of batch process again for calibration speed.

Description of drawings

Fig. 1 is the power output (P of automated power control (APC) with the TD-SCDMA radio-frequency power amplifier _Out) the circuit connecting relation schematic diagram;

Fig. 2 is calibration steps calibration back radio-frequency power amplifier (P of the present invention _Out) the calibration point formation simulation curve figure corresponding with automated power control (APC);

Fig. 3 is the structural representation of the production calibrating installation of TD-SCDMA radio-frequency power amplifier of the present invention.

Embodiment

Regulation according to the TD-SCDMA agreement, the calibration range of the power output of radio-frequency power amplifier is-50dBm～24dBm, error requirements is within 1dB, the present invention is based on and adopts mode such as manual to carry out in advance the less point of calibration in the calibration range of the power output of radio-frequency power amplifier, then according to precalibrated point, automatically remaining point in the calibration range of the power output of calibrate radio frequency power amplifier, thus reach the purpose of very fast calibration speed.Title needs precalibrated P among the present invention in the calibration range of the power output of radio-frequency power amplifier _Out(power output) value is for characteristic value, and other output power value employing curve fit formula in the calibration range of the power output of radio-frequency power amplifier except that calibration in advance is calibrated automatically.

According to a large amount of evidences, the method that manual in advance calibration is 3 is present the fastest the most accurate calibration steps, promptly adopt manual calibrating mode calibration in advance radio-frequency power amplifier power output calibration range higher limit 24dBm, lower limit-50dBm and-the corresponding calibration point of these three values of 10dBm, wherein ,-this point of 10dBm is a key point.Certainly, the method for the calibration point of the characteristic value correspondence in the calibration range of the power output of calibration in advance radio-frequency power amplifier is not limited to the method that the present invention proposes.Manual calibrating mode is a kind of better embodiment of the present invention.

Below in conjunction with Fig. 2 the technical scheme of the production calibration steps of TD-SCDMA radio-frequency power amplifier of the present invention is further described in detail:

Accompanying drawing 2 has reflected the power output (P of the radio-frequency power amplifier of automated power control of the present invention (APC) and TD-SCDMA _Out) relation, its implementation procedure mainly comprises the steps:

Step 1, in advance manual calibration-50dBm ,-three calibration point (APC of 10dBm and these three value correspondences of 24dBm _Min,-50), (APC _Mid,-10) and (APC _Max, 24), as shown in Figure 2.

The calibration of step 2, remaining 72 point adopts the curve fit mode to realize, with-10dBm is a separation, is divided into two parts up and down;

For the first half greater than-10dBm, the curve fit formula is:

$\mathrm{APC}=A*{(\frac{P_{\mathrm{out}}}{k_1}+B)}^2+k_2---\left(1\right)$

Wherein, the automatic power control value of APC for calculating, the APC here adopts decimal representation, and generally this value is kept in the fixed memory of mobile phone with the hexadecimal form after calculating.P _OutPower output for this moment.A, the self-defining constant of B, K ₁, K ₂Be calculative parameter, try to achieve K respectively by following formula (2) and formula (3) and formula (4) ₁, K ₂Value:

$k_1=\frac{2*A*B*(24-m)+\mathrm{\Δ}}{2*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})}---\left(2\right)$

$k_2={\mathrm{APC}}_{\max }-A*{(\frac{24}{k_1}+B)}^2---\left(3\right)$

$\mathrm{\Δ}=\sqrt{{(2*A*B*(24-m))}^2+4*A*({24}^2-m^2)*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})}---\left(4\right)$

Wherein, the constant m=-10 in formula (2), the formula (4), this value correspondence-this key value of 10dBm; In formula (1), formula (2), formula (3) and the formula (4), self-defined constant A=10, B=5, self-defined constant A here and the value of B can have some variations, and its excursion is 5≤A≤15,0≤B≤10; Power P _OutSpan be-10dBm＜P _Out＜24dBm;

For the latter half less than-10dBm, the curve fit formula is:

$\mathrm{APC}=C*\sqrt{k_3*P_{\mathrm{out}}+D}+k_4---\left(5\right)$

Wherein, APC adopts the decimal system for the automatic power control value of the calibration point that will calculate, the APC here, and generally this value is calculated and is kept in the fixed memory of mobile phone with the hexadecimal form afterwards.P _OutPower output for this moment.C, D are self-defining constant.K ₃, K ₄Be calculative parameter, try to achieve K by following formula (6), formula (7), formula (8), formula (9) and formula (10) ₃, K ₄Value:

$k_3=\frac{b+\sqrt{b^2-4*a*c}}{2*a}---\left(6\right)$

$k_4={\mathrm{APC}}_{\mathrm{mid}}-C*\sqrt{D+m*k_3}---\left(7\right)$

Wherein: a=C ⁴* (m+50) ²(8)

b＝2*C ²*(m-50)*((APC _mid-APC _min) ²-2*D*C ²)+4*C ⁴*(m-50)*D (9)

c＝((APC _mid-APC _min) ²-2*D*C ²) ²-4*C ⁴*D ² (10)

In above-mentioned formula (7), formula (8) and the formula (9), constant m=-10, this value correspondence-this key value of 10dBm;

In formula (5), formula (7), formula (8), formula (9) and the formula (10), self-defined constant C=26, D=775, the self-defined constant C here, the value of D can have some variations, and its excursion can be 21≤C≤31,770≤D≤780; Power P _OutSpan be-50dBm＜P _Out＜-10dBm.

The curve of above-mentioned formula (1) and formula (5) representative is simulation curve (as shown in Figure 2), wherein, and P _OutBetween-50dBm～24dBm, get the value that step-length is 1dBm;

Such as: work as P _OutDuring for 20dBm, the value that adopts formula (1) to calculate APC is the decimal system 732, and being converted to hexadecimal is 2DC, and the precision that this value reflects is coincide and the protocol compliant requirement substantially with the precision of manual calibration.As a same reason, get P _OutDuring for-20dBm, adopt formula (5) also to obtain same conclusion, all the other calibration points form the APC table with the same manner calibration back and the point calibrated, and form is as follows:

Power output P out(dBm)	APC control word (16 system)
		24	300
23	2F6
		22	2ED
21	2E5
		20	2DC
19	2D3
		18	2CA
17	2C2
		16	2B9
15	2B1
		14	2A9
13	2A1
		12	299
11	291
		10	289
9	281

8	279
		7	272
6	26A
		5	263
4	25C
		3	255
2	24D
		1	246
0	23F
		-1	239
-2	232
		-3	22B
-4	225
		-5	21E
-6	218
		-7	212
-8	20C
		-9	205
-10	200
		-11	1F9
-12	1F1
		-13	1EA
-14	1E3
		-15	1DC
-16	1D4
		-17	1CD
-18	1C5
		-19	1BE
-20	1B6
		-21	1AE
-22	1A6
		-23	19E
-24	196
		-25	18D
-26	185
		-27	17C
-28	173
		-29	16A
-30	161
		-31	158
-32	14F
		-33	145
-34	13B
		-35	131
-36	127

-37	11C
		-38	112
-39	107
		-40	0FB
-41	0F0
		-42	0E3
-43	0D7
		-44	0CA
-45	0BD
		-46	0AF
-47	0A0
		-48	091
-49	081
		-50	070

The APC table

Step 3, the APC table that will calibrate well deposit in the fixed memory of TD-SCDMA mobile phone, use during for detection.

Each APC value in the above-mentioned table, be by the curve fit formula in-10dBm～24dBm scope and-50dBm～-curve fit formula in the 10dBm scope calculates, thereby overcome the manual pointwise calibrating mode of wasting time and energy originally, but satisfied the required precision of TD-SCDMA agreement regulation and satisfy the requirement of batch process calibration speed.Calibration point in the last table (has only been expressed the part calibration point) among Fig. 2 shown in Fig. 2 orbicular spot.

As shown in Figure 3, technical scheme of the present invention also comprises the production calibrating installation of TD-SCDMA radio-frequency power amplifier, comprising: characteristic value input unit, automated power control computation unit and automated power control output unit.

Wherein, the characteristic value input unit is used to receive the automatic power control value that calibration in advance obtains, and the automatic power control value that obtains is sent to the automated power control computation unit; Described automatic power control value comprises the corresponding respectively automatic power control value of upper limit characteristic value, lower limit characteristic value and the 3rd characteristic value in the calibration range of power output of radio-frequency power amplifier;

In actual applications, this characteristic value input unit can receive the upper limit characteristic value of manual calibration, the automatic power control value that lower limit characteristic value and the 3rd characteristic value are corresponding respectively, and be sent to the automated power control computation unit.

The automated power control computation unit, be used for according to automatic power control value from described characteristic value input unit, and the power output of each calibration point in the calibration range of the power output of radio-frequency power amplifier, carry out curve by The Fitting Calculation, obtain the automatic power control value of each calibration point correspondence except that described upper limit characteristic value, lower limit characteristic value and the 3rd characteristic value are distinguished corresponding calibration point.

Automated power control output unit is used for the result of calculation output with described automated power control computation unit.

Automated power control output unit links to each other with the TD-SCDMA radio-frequency power amplifier, and automated power control output unit utilizes the result of its output to control the power output of TD-SCDMA radio-frequency power amplifier.

Wherein, the automatic power control value computing unit comprises:

The first curve fit formula computing unit, be used for the automatic power control value corresponding respectively according to the upper limit characteristic value of obtaining from described characteristic value input unit, the 3rd characteristic value, utilize the first curve fit formula to calculate, and result of calculation is exported between the corresponding automatic power control value of output power value between described upper limit characteristic value and the 3rd characteristic value;

The second curve fit formula computing unit, be used for the automatic power control value corresponding respectively according to the 3rd characteristic value of obtaining from described characteristic value input unit, lower limit characteristic value, utilize the second curve fit formula to calculate, and result of calculation is exported between the corresponding automatic power control value of output power value between described the 3rd characteristic value and the lower limit characteristic value.

Above-mentioned upper limit characteristic value is 24dbm, and the 3rd characteristic value is-10dbm, and the lower limit characteristic value is-50dbm, and the first curve fit formula computing unit utilizes following formula to calculate between-10dbm and the corresponding automatic power control value of output power value between the 24dbm:

$\mathrm{APC}=A*{(\frac{P_{\mathrm{out}}}{k_1}+B)}^2{k}_2$

Wherein, P _OutBe the radio-frequency power amplifier power output of this moment, the automatic power control value of APC for calculating, A, B, C, D are self-defined constant, K ₁, K ₂Be the constant parameter;

The constant parameter K ₁Computing formula be: $k_1=\frac{2*A*B*(24-m)+\mathrm{\Δ}}{2*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})};$

The constant parameter K ₂Computing formula be: $k_2={\mathrm{APC}}_{\max }-A*{(\frac{24}{k_1}+B)}^2;$

Wherein, APC _MaxBe the automatic power control value of upper limit characteristic value correspondence, i.e. P _OutThe automatic power control value of correspondence during for 24dBm; APC _MidBe the automatic power control value of the 3rd characteristic value correspondence, i.e. P _OutThe automatic power control value of correspondence during for-10dBm, the computing formula of Δ is:

$\mathrm{\Δ}=\sqrt{{(2*A*B*(24-m))}^2+4*A*({24}^2-m^2)*({\mathrm{APC}}_{\mathrm{mac}}-{\mathrm{APC}}_{\mathrm{mid}})},$ Wherein, the span of self-defined constant A is: 5≤A≤15, the span of self-defined constant B is: 0≤B≤10, m=-10.

The second curve fit formula computing unit utilizes following formula to calculate between the corresponding automatic power control value of output power value between-50dbm and the-10dbm:

$\mathrm{APC}=C*\sqrt{k_3*P_{\mathrm{out}}+D}+k_4$

Wherein, P _OutBe the radio-frequency power amplifier power output of this moment, the automatic power control value of APC for calculating, A, B, C, D are self-defined constant, K ₃, K ₄Be the constant parameter,

The constant parameter K ₃Computing formula be: $k_3=\frac{b+\sqrt{b^2-4*a*c}}{2*a},$

The constant parameter K ₄Computing formula be: $k_4={\mathrm{APC}}_{\mathrm{mid}}-C*\sqrt{D+m*k_3},$

Wherein, a=C ⁴* (m+50) ²

b＝2*C ²*(m-50)*((APC _mid-APC _min) ²-2*D*C ²)+4*C ⁴*(m-50)*D；

C=((APC _Mid-APC _Min) ²-2*D*C ²) ²-4*C ⁴* D ²Wherein, the span of self-defined constant C is:

21≤C≤31, the span of self-defined constant D is: 770≤D≤780, m=-10, APC _MidBe the automatic power control value of the 3rd characteristic value correspondence, i.e. P _OutThe automatic power control value of correspondence during for-10dBm, APC _MinBe the automatic power control value of lower limit characteristic value correspondence, i.e. P _OutThe automatic power control value of correspondence during for-50dBm.

In sum, method and apparatus provided by the present invention is compared with manual pointwise calibration, and manual pointwise calibration needs manual each interior value of output power range that is aligned in the TD-SCDMA radio-frequency power amplifier, expends a large amount of time like this; The present invention only need adopt 3 points of mode calibration in advance such as manual, be in the production calibration range of TD-SCDMA radio-frequency power amplifier-50dBm ,-point of three values correspondences of 10dBm, 24dBm, remaining value in the production calibration range of TD-SCDMA radio-frequency power amplifier adopts the mode of curve fit to calibrate, the curve fit formula that the present invention proposes to the calibration accuracy of TD-SCDMA radio-frequency power amplifier also than higher, both can satisfy the required precision of agreement regulation, save the alignment time greatly, can satisfy the requirement of batch process again for calibration speed.

Claims (12)

1, a kind of production calibration steps of TD-SCDMA radio-frequency power amplifier is characterized in that, comprises the steps:

(1) in the calibration range of the power output of radio-frequency power amplifier, chooses upper limit characteristic value, the lower limit characteristic value, and the 3rd characteristic value between this upper limit characteristic value and the lower limit characteristic value, and calibrate the calibration point of their correspondences, obtain the automatic power control value of described upper limit characteristic value correspondence, the automatic power control value of described lower limit characteristic value correspondence, and the automatic power control value of described the 3rd characteristic value correspondence;

(2), utilize the curve fit formula to calibrate other calibration point except that the corresponding respectively calibration point of upper limit characteristic value, lower limit characteristic value and the 3rd characteristic value in the calibration range of power output of described radio-frequency power amplifier according to three automatic power control value that obtained in the step (1).

2, the production calibration steps of TD-SCDMA radio-frequency power amplifier as claimed in claim 1 is characterized in that, described the 3rd characteristic value is-10dbm.

3, the production calibration steps of TD-SCDMA radio-frequency power amplifier as claimed in claim 2 is characterized in that, described upper limit characteristic value is 24dbm, and described lower limit characteristic value is-50dbm.

As the production calibration steps of claim 1,2 or 3 described TD-SCDMA radio-frequency power amplifiers, it is characterized in that 4, described step (2) is specially:

(21), utilize the calibration of the first curve fit formula between the corresponding calibration point of output power value between described upper limit characteristic value and the 3rd characteristic value according to described upper limit characteristic value, lower limit characteristic value and the corresponding respectively automatic power control value of the 3rd characteristic value; Utilize second curve fit formula calibration between the corresponding calibration point of output power value between described the 3rd characteristic value and the lower limit characteristic value.

5, the production calibration steps of TD-SCDMA radio-frequency power amplifier as claimed in claim 4 is characterized in that, described step (21) is specially:

(211) according to described upper limit characteristic value 24dBm, lower limit characteristic value-50dBm and the corresponding respectively automatic power control value of the 3rd characteristic value-10dBm, utilize the first curve fit formula:

$\mathrm{APC}=A*{(\frac{P_{\mathrm{out}}}{k_1}+B)}^2+k_2$ The calibration point of the output power value correspondence between-10dBm and 24dBm of calibrate radio frequency power amplifier;

Utilize the second curve fit formula: $\mathrm{APC}=C*\sqrt{k_3*P_{\mathrm{out}}+D}+k_4$ The calibrate radio frequency power amplifier between-50dBm and-calibration point of output power value correspondence between the 10dBm;

Wherein, P _OutBe the radio-frequency power amplifier power output of this moment, the automatic power control value of APC for calculating, A, B, C, D are self-defined constant, K ₁, K ₂, K ₃, K ₄Be the constant parameter.

6, the production calibration steps of TD-SCDMA radio-frequency power amplifier as claimed in claim 5 is characterized in that, constant parameter K in the described step (211) ₁Computing formula be:

$k_1=\frac{2*A*B*(24-m)+\mathrm{\Δ}}{2*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})};$

The constant parameter K ₂Computing formula be:

$k_2={\mathrm{APC}}_{\max }-A*{(\frac{24}{k_1}+B)}^2;$

Wherein, APC _MaxAutomatic power control value for described upper limit characteristic value correspondence; APC _MidBe the automatic power control value of described the 3rd characteristic value correspondence, the computing formula of Δ is:

$\mathrm{\Δ}=\sqrt{{(2*A*B*(24-m))}^2+4*A*({24}^2-m^2)*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})},$ Wherein, A, B are self-defined constant, m=-10.

7, the production calibration steps of TD-SCDMA radio-frequency power amplifier as claimed in claim 6 is characterized in that, constant parameter K in the described step (211) ₃Computing formula be:

$k_3=\frac{b+\sqrt{b^2-4*a*c}}{2*a},$

The constant parameter K ₄Computing formula be: $k_4={\mathrm{APC}}_{\mathrm{mid}}-C*\sqrt{D+m*k_3},$

Wherein, a=C ⁴* (m+50) ²

$a=C^4*{(m+50)}^2;$

b＝2*C ²*(m-50)*((APC _mid-APC _min) ²-2*D*C ²)+4*C ⁴*(m-50)*D；

C=((APC _Mid-APC _Min) ²-2*D*C ²) ²-4*C ⁴* D ²Wherein, C, D are self-defined constant, m=-10, APC _MidBe the automatic power control value of described the 3rd characteristic value correspondence, APC _MinAutomatic power control value for described lower limit characteristic value correspondence.

8, the production calibration steps of TD-SCDMA radio-frequency power amplifier as claimed in claim 1 is characterized in that, described step (2) also comprises afterwards:

With the output power value between upper limit characteristic value and lower limit characteristic value of radio-frequency power amplifier and be stored in by the automatic power control value that output power value calculates in the fixed memory of mobile phone.

9, a kind of production calibrating installation of TD-SCDMA radio-frequency power amplifier is characterized in that, comprising: characteristic value input unit, automated power control computation unit and automated power control output unit;

Wherein, described characteristic value input unit, be used to receive the automatic power control value that obtains through calibration in advance, described automatic power control value comprises: the automatic power control value that the upper limit characteristic value in the calibration range of the power output of radio-frequency power amplifier, lower limit characteristic value and the 3rd characteristic value are corresponding respectively;

Described automated power control computation unit, be used for according to automatic power control value from described characteristic value input unit, and the power output of each calibration point in the calibration range of the power output of radio-frequency power amplifier, calculating carries out curve fitting, obtain to remove described upper limit characteristic value, the automatic power control value of each calibration point that the calibration point of lower limit characteristic value and the 3rd characteristic value difference correspondence is outer;

Described automated power control output unit is used for the result of calculation output with described automated power control computation unit.

10, the production calibrating installation of TD-SCDMA radio-frequency power amplifier as claimed in claim 9 is characterized in that, described automated power control computation unit comprises:

The first curve fit formula computing unit, be used for the automatic power control value corresponding respectively, utilize the first curve fit formula to calculate between the corresponding automatic power control value of output power value between described upper limit characteristic value and the 3rd characteristic value according to the upper limit characteristic value of obtaining from described characteristic value input unit, the 3rd characteristic value;

The second curve fit formula computing unit, be used for the automatic power control value corresponding respectively, utilize the second curve fit formula to calculate between the corresponding automatic power control value of output power value between described the 3rd characteristic value and the lower limit characteristic value according to the 3rd characteristic value of obtaining from described characteristic value input unit, lower limit characteristic value.

11, the production calibrating installation of TD-SCDMA radio-frequency power amplifier as claimed in claim 10, it is characterized in that, described upper limit characteristic value is 24dbm, the 3rd characteristic value is-10dbm, and the described first curve fit formula computing unit utilizes following formula to calculate between-10dbm and the corresponding automatic power control value of output power value between the 24dbm:

$\mathrm{APC}=A*{(\frac{P_{\mathrm{out}}}{k_1}+B)}^2+k_2$

Wherein, P _OutBe the radio-frequency power amplifier power output of this moment, the automatic power control value of APC for calculating, A, B, C, D are self-defined constant, K ₁, K ₂Be the constant parameter;

The constant parameter K ₁Computing formula be: $k_1=\frac{2*A*B*(24-m)+\mathrm{\Δ}}{2*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})};$

The constant parameter K ₂Computing formula be: $k_2={\mathrm{APC}}_{\max }-A*{(\frac{24}{k_1}+B)}^2;$

Wherein, APC _MaxAutomatic power control value for described upper limit characteristic value correspondence; APC _MidBe the automatic power control value of described the 3rd characteristic value correspondence, the computing formula of Δ is:

$\mathrm{\Δ}=\sqrt{{(2*A*B*(24-m))}^2+4*A*({24}^2-m^2)*({\mathrm{APC}}_{\max }-{\mathrm{APC}}_{\mathrm{mid}})},$ Wherein, m=-10.

12, the production calibrating installation of TD-SCDMA radio-frequency power amplifier as claimed in claim 10, it is characterized in that, described the 3rd characteristic value is-10dbm, the lower limit characteristic value is-50dbm, and the described second curve fit formula computing unit utilizes following formula to calculate between the corresponding automatic power control value of output power value between-50dbm and the-10dbm:

$\mathrm{APC}=C*\sqrt{k_3*P_{\mathrm{out}}+D}+k_4$

Wherein, P _OutBe the radio-frequency power amplifier power output of this moment, the automatic power control value of APC for calculating, A, B, C, D are self-defined constant, K ₃, K ₄Be the constant parameter,

The constant parameter K ₃Computing formula be: $k_3=\frac{b+\sqrt{b^2-4*a*c}}{2*a},$

The constant parameter K ₄Computing formula be: $k_4={\mathrm{APC}}_{\mathrm{mid}}-C*\sqrt{D+m*k_3},$

Wherein, a=C ⁴* (m+50) ²

b＝2*C ²*(m-50)*((APC _mid-APC _min) ²-2*D*C ²)+4*C ⁴*(m-50)*D；

C=((APC _Mid-APC _Min) ²-2*D*C ²) ²-4*C ⁴* D ²Wherein, m=-10, APC _MidBe the automatic power control value of described the 3rd characteristic value correspondence, APC _MinAutomatic power control value for described lower limit characteristic value correspondence.

Images