CN101394195B - Method for suppressing GSM stray - Google Patents
Method for suppressing GSM stray Download PDFInfo
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- CN101394195B CN101394195B CN2008102013335A CN200810201333A CN101394195B CN 101394195 B CN101394195 B CN 101394195B CN 2008102013335 A CN2008102013335 A CN 2008102013335A CN 200810201333 A CN200810201333 A CN 200810201333A CN 101394195 B CN101394195 B CN 101394195B
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Abstract
The invention relates to a method of restraining out-of-band stray of a transmitter. The method is used for restraining the out-of-band stray of a GSM mobile terminal which is caused by the transmitter. The method is completed through changing parameters which are provided for a power amplifier in a register so as to improve forward isolation degree thereof, and has no impact on overall system stability. The method provided by the invention enables the GSM mobile terminal composed of an SI4901 single chip platform based on an NXP and an SKY77518 to effectively restrain the out-of-band stray of the transmitter which is caused by the out-of-band stray which is output by a built-in transmitter and the low forward isolation degree of the SKY77518.
Description
Technical field
The present invention relates to a kind of method of the GSM of inhibition band stray.
Background technology
GSM mobile handset develops into now, is used by thousands of user.The standard of GSM use TDMA is carried out communication, in transmitting power, also is with the problem of serving EMC (electromagnetic compatibility).International and domestic all have a strict requirement to this, wherein just comprised spuious requirement.
Producing spuious interference source has a variety ofly, and wherein a kind of common interference source produces by transmitter is inner, is entrained in the afterbody of useful signal sequence, and its amplitude far exceeds the requirement of EMC.For example, in the GSM solution of this single-chip of SI4901 that uses NXP, the transmitter of the transceiver that SI4901 is inner integrated just has band stray output.For with in this spuious scope that is suppressed to required standard, normally utilize radio-frequency power amplifier (hereinafter to be referred as power amplifier) that signal is processed, this has just proposed very high requirement to the forward direction isolation of power amplifier.
For the design of GSM mobile handset cheaply, usually can't satisfy the requirement of above-mentioned forward direction isolation for power amplifier, common solution is to adjust the sequential of transmitter now, and band stray is closed through out-of-date power amplifier passage.But for relative some the more nervous low side baseband processing chip of resource, such as SI4901, this method of in the emission control sequential of regulation, the transmission envelop time being delayed, because realizing that the time that takies other functional modules in the engineering can cause the decline of handset capability, as the results such as button is slow in reacting appear.
Summary of the invention
In order to solve the problems of the technologies described above, but the invention provides a kind of method of simple, general establishment transmitter band stray.
A kind of method that suppresses band stray is characterized in that: by changing the control magnitude of voltage of power amplifier, substitute the pre-thermal voltage of power amplifier.
The control magnitude of voltage of described change power amplifier is with compensating to the preheating magnitude of voltage less than the preheating magnitude of voltage in the initial value of control voltage.
Described control voltage initial value is Vramp UP tabular value.
The control magnitude of voltage of described change power amplifier is to realize by the change to the register relevant parameter.
The invention provides a kind of method of curb transmitter band stray, the method is by changing the control magnitude of voltage of power amplifier, substitute the pre-thermal voltage of power amplifier, avoided power amplifier that the pre-thermal voltage owing to sustainable existence causes to the scale-up problem of band stray, improved the performance of transmitter, and implementation procedure only need change some firmware parameters, and is simple to operate, need not to increase or any hardware of upgrading, and saved cost, reduced workload.
Description of drawings
Below, describe in conjunction with the accompanying drawings and embodiments details and working condition according to put forward the methods of the present invention in detail.
Fig. 1 is the SI4901+SKY77518 system block diagram
Fig. 2 is power amplifier preheating level value and time demand figure
Fig. 3 is that GB requires power/time diagram
Fig. 4 is the band stray that transmitter produces
Fig. 5 is the band stray of power amplifier output
Fig. 6 is the power/time diagram after changing
Fig. 7 is the band stray behind the power amplifier of passing through through suppressing
Embodiment
This specific embodiment selects the SI4901 chip of NXP as development platform, its inner integrated transceiver after the signal demand of its transmitter emission carries out power amplification via the external radio frequency amplifier, is gone out by aerial radiation again, communicate with the base station, as shown in Figure 1.
In this emission process, guarantee that the precondition of power amplifier normal operation is: need to be before power amplifier be opened, power amplifier is added at least low-voltage of 0.2V of one of needss, to the power amplifier preheating, this time need continue about 12us, as shown in Figure 2.Otherwise, if provide suddenly the amplifier magnification ratio control voltage (hereinafter to be referred as Vramp) that the volt value is higher, will cause the power amplifier rising edge that an impact is arranged, spectrum exceeds standard or surplus is too little and cause switching.Rising edge and trailing edge when GB is worked to power amplifier have clear and definite restriction, as shown in Figure 3.
This platform of SI4901 is in strict accordance with the sequential of each state of normalized definition of GSM: at first give a high level to power amplifier and enable, then provide one group of magnitude of voltage to open VRAMP, give afterwards a high level and enable to open duplexer.The required 0.2V voltage of aforesaid power amplifier preheating, the opening and closing of power amplifier in this process, have been run through, and between the time of transmitter output signal between the switching of power amplifier, this has just caused the forward direction isolation of power amplifier to reduce, band stray with transmitter output has amplified on the contrary, as shown in Figure 4 and Figure 5.
In the GSM platform of this single-chip of NXP, the pre-thermal voltage of this power amplifier is by realizing in " txVrampMin " parameter of NVRam the inside definition, and is as shown in the table:
Table one system default txVrampMin
| [0] | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x00 |
| [1] | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x00 |
| [2] | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 |
| [3] | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 | 0x32 |
In this table, what first row represented is four frequency ranges, and what back 16 row from left to right represented successively is power grade.0x32 is the numerical value of a digital-to-analogue converter, and the conversion output voltage is 0.2V, as shown in Figure 2, is the pre-thermal voltage of the Vramp pin needs of SKY77518.Before the Vramp rising edge and after the trailing edge, the 200mV voltage of an about 11.6us is arranged, the requirement of this and power amplifier matches.
In register the inside, in 16 steps in the rising edge slope of Vramp (RAMP UP), the numerical value of the digital to analog converter of front several steps is " 0 ", and output voltage values is 0. shown in following table two:
Table two rising edge slope step table (RAMP UP Table)
| [0] | 0x0000 | 0x0000 | 0x000F | 0x003B | 0x0081 | 0x00DD | 0x014A | 0x01C2 | 0x023E | 0x02B6 | 0x0323 | 0x037F | 0x03C5 | 0x03F1 | 0x0400 | 0x0400 |
| [1] | 0x0000 | 0x0000 | 0x0000 | 0x0015 | 0x0051 | 0x00B1 | 0x012B | 0x01B7 | 0x0249 | 0x02D5 | 0x034F | 0x03AF | 0x03EB | 0x0400 | 0x0400 | 0x0400 |
| [2] | 0x0000 | 0x0000 | 0x0000 | 0x0000 | 0x0000 | 0x000D | 0x0070 | 0x0122 | 0x0200 | 0x02DE | 0x0390 | 0x0400 | 0x0400 | 0x0400 | 0x0400 | 0x0400 |
| [3] | 0x0000 | 0x0000 | 0x0000 | 0x0000 | 0x0000 | 0x0033 | 0x00C1 | 0x018E | 0x0272 | 0x033F | 0x03EB | 0x0400 | 0x0400 | 0x0400 | 0x0400 | 0x0400 |
In 16 steps of trailing edge slope (RAMPDOWN), the numerical value of the digital to analog converter of rear several steps is " 0 ", and output voltage values is 0. shown in following table three:
Table three trailing edge slope step table (RAMPDOWN Table)
| [0] | 0x0400 | 0x0400 | 0x03F1 | 0x03C5 | 0x037F | 0x0323 | 0x02B6 | 0x023E | 0x01C2 | 0x014A | 0x00DD | 0x0081 | 0x003B | 0x000F | 0x0000 | 0x0000 |
| [1] | 0x0400 | 0x0400 | 0x0400 | 0x03EB | 0x03AF | 0x034F | 0x02D5 | 0x0249 | 0x01B7 | 0x012B | 0x00B1 | 0x0051 | 0x0015 | 0x0000 | 0x0000 | 0x0000 |
| [2] | 0x0400 | 0x0400 | 0x0400 | 0x0400 | 0x0400 | 0x0390 | 0x02DE | 0x0200 | 0x0122 | 0x0070 | 0x000D | 0x0000 | 0x0000 | 0x0000 | 0x0000 | 0x0000 |
| [3] | 0x0400 | 0x0400 | 0x0400 | 0x0400 | 0x03EB | 0x034F | 0x02D5 | 0x01F4 | 0x012C | 0x0096 | 0x0015 | 0x0000 | 0x0000 | 0x0000 | 0x0000 | 0x0000 |
The inventive method implementation is 0 by the value Change All with " txVrampMin " in the register, and front, " RAMP UP Table " the inside is all changed less than the value of 0x32 and become 0x32, provide VRAMP to open the before necessary pre-thermal voltage of 0.2V (by the SPEC of power amplifier to power amplifier, namely describe in detail, repeatedly the experience of actual tests and project volume production operation has confirmed that the pre-thermal voltage of 0.2V only needs to continue 12us before Vramp nonzero value signal arrives), amended RAMP UP Table is shown in following table four:
RAMP UP Table after table four change
| [0] | 0x0032 | 0x0032 | 0x0032 | 0x003B | 0x0081 | 0x00DD | 0x014A | 0x01C2 | 0x023E | 0x02B6 | 0x0323 | 0x037F | 0x03C5 | 0x03F1 | 0x0400 | 0x0400 |
| [1] | 0x0032 | 0x0032 | 0x0032 | 0x0032 | 0x0051 | 0x00B1 | 0x012B | 0x01B7 | 0x0249 | 0x02D5 | 0x034F | 0x03AF | 0x03EB | 0x0400 | 0x0400 | 0x0400 |
| [2] | 0x0032 | 0x0032 | 0x0032 | 0x0032 | 0x0032 | 0x0032 | 0x0070 | 0x0122 | 0x0200 | 0x02DE | 0x0390 | 0x0400 | 0x0400 | 0x0400 | 0x0400 | 0x0400 |
| [3] | 0x0032 | 0x0032 | 0x0032 | 0x0032 | 0x0032 | 0x0033 | 0x00C1 | 0x018E | 0x0272 | 0x033F | 0x03EB | 0x0400 | 0x0400 | 0x0400 | 0x0400 | 0x0400 |
By like this to the change of register parameters, can see that actual Vramp waveform shown in Figure 6 compares with Fig. 2, before Vramp rises, still the have an appointment magnitude of voltage of 140mV of 11.8us, satisfied power amplifier preheating needs, and after the trailing edge of Vramp, then be that a smooth curve is to 0V voltage, do not have step, do not have the phenomenon of again band stray being amplified.Measure again the band stray of power amplifier output this time, reached extraordinary inhibition, as shown in Figure 7.
Above method is applied to the SI4904/5 platform of NXP, also can obtain effect same.
Claims (2)
1. a method that suppresses band stray is characterized in that: by changing the control magnitude of voltage of power amplifier, substitute the pre-thermal voltage of power amplifier; The control magnitude of voltage of described change power amplifier be that the magnitude of voltage less than the preheating magnitude of voltage in the initial value of control voltage is compensated to the preheating magnitude of voltage, and described control voltage initial value is Vramp UP tabular value.
2. the method for inhibition band stray according to claim 1 is characterized in that: the control magnitude of voltage of described change power amplifier is to realize by the change to the register relevant parameter.
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| CN2008102013335A CN101394195B (en) | 2008-10-17 | 2008-10-17 | Method for suppressing GSM stray |
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| CN101394195B true CN101394195B (en) | 2013-03-27 |
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| CN106685461B (en) * | 2017-02-10 | 2020-04-17 | 力同科技股份有限公司 | Digital talkback terminal |
| CN110620616B (en) * | 2018-12-18 | 2023-01-31 | 科大国盾量子技术股份有限公司 | Weak coherent light source device and quantum key distribution system |
| CN111181582B (en) * | 2020-01-06 | 2021-11-12 | 闻泰通讯股份有限公司 | Interference signal processing method and device and GSM mobile terminal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1137198A (en) * | 1995-03-30 | 1996-12-04 | 美国电报电话Ipm公司 | High-efficient configurable power amplifier for use in portable unit |
| CN1300470A (en) * | 1999-04-27 | 2001-06-20 | 松下电器产业株式会社 | Apparatus and method for power control |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1137198A (en) * | 1995-03-30 | 1996-12-04 | 美国电报电话Ipm公司 | High-efficient configurable power amplifier for use in portable unit |
| CN1300470A (en) * | 1999-04-27 | 2001-06-20 | 松下电器产业株式会社 | Apparatus and method for power control |
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