CN101499782A - Output power controlling circuit design method for radio frequency power amplifier - Google Patents
Output power controlling circuit design method for radio frequency power amplifier Download PDFInfo
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- CN101499782A CN101499782A CNA2008100032261A CN200810003226A CN101499782A CN 101499782 A CN101499782 A CN 101499782A CN A2008100032261 A CNA2008100032261 A CN A2008100032261A CN 200810003226 A CN200810003226 A CN 200810003226A CN 101499782 A CN101499782 A CN 101499782A
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Abstract
The invention relates to a new designing method of an integrated circuit of a controller for controlling the output power of a radio frequency power amplifier. The designing method of the integrated circuit of the controller uses a voltage differential signal between a drain and a source of a field effect transistor to change the voltage of a base or a gate of the amplifier, thus achieving the purpose of controlling the level of the output power of the amplifier. The method can design a controller of an integrated circuit for matching with the radio frequency power amplifier and controlling the radio frequency output power of the amplifier.
Description
Technical field
The present invention relates to a kind of circuit design method of power output of new control radio-frequency power amplifier.Particularly relate to and be applied in wireless telecommunication system, matching RF power amplifier, a kind of circuit design method of controlling radio-frequency power of its radio frequency power output size of adjustment control.Utilization the method can be designed one and be applied in wireless telecommunication system, have the integrated circuit controller of the control radio-frequency power of inter-industry competition.Matching RF power amplifier and the designed controller that comes out of utilization the present invention will can be made into a radio frequency power amplification module that contains radio frequency power output control.
Background technology
The present known radio-frequency power amplifier that is used in mobile phone, the control method of control radio frequency power output size has three kinds, as Fig. 2, Fig. 3 and shown in Figure 4, be respectively the Poewr control method of power sensing (power sensing), the Poewr control method of current sense (current sensing), the Poewr control method of RFMD (RFMicro Devices Incorporation) patent.
Fig. 2 is a control method of utilizing power sensing (power sensing).The radio frequency power output of minute quantity ratio (RF output power) is sent to power sensing control circuit 20 (Power Sense Controller) by directional coupler 18 (drectional coupler), the radio frequency power output of this minute quantity ratio can be converted into equivalent voltage, again by with fundamental frequency (Base Band) the power controlling signal that system provided; V
APC19 voltage ratio, thereby adjust the size of base stage (base) 17 voltages of radio-frequency power amplifier, thereby reach control for the precision of radio frequency power output size.
Fig. 3 is a control method of utilizing current sense (current sensing).When radio-frequency power amplifier is operated, its radio-frequency power of launching size with flow through R
SENSE21 electric current has the proportionate relationship of a similar linearity.Utilize this proportionate relationship characteristic, current sense control circuit 22 (CurrentSense Controller) will flow through R
SENSE21 current conversion becomes equivalent voltage, again by the power controlling signal that is provided with the fundamental frequency system; V
APC23 voltage ratio, thereby adjust the size of base stage 25 voltages of radio-frequency power amplifier, thereby reach control for the precision of radio frequency power output size.
Fig. 4 is the Poewr control method of RFMD patent, its V
GS34 control circuits 33 are utilization TX_Enable (the fundamental frequency system provides the Numerical Control signal that does not begin to export radio-frequency power) 31 and V
APC32 two input signals and back coupling and also make comparisons through the collection utmost point 35 voltages of conversion, thereby control V
GSThe size of 34 magnitudes of voltage.V
GSThe size of 34 magnitudes of voltage can change the voltage 35 of the collection utmost point of radio-frequency power amplifier.Utilization changes the size of collector volatge and controls the size of radio frequency power output, thereby reaches the effect of the radio frequency power output of its control radio-frequency power amplifier.
Summary of the invention
With the GSM mobile handset system is example, and as shown in Figure 5, there is very strict requirement in the GSM mobile handset system for the precision of radio frequency power output.Therefore because the magnitude of voltage of battery of mobile phone has sizable variation, it may not wait from 3.2V to 4.6V, can influence the precision of the power output of radio-frequency power amplifier, in addition as variation of temperature, the difference of assembly ... etc. factor, also can influence precision.The purpose of power control (power control) is exactly in order to overcome this difficulty.Circuit design method of the present invention can overcome the requirement of wireless telecommunication system for the precision of radio frequency power output.
As shown in Figure 1, a field-effect transistor 5 (Field Effect Transistor) uses all can of P type channel-type or N type channel-type.These field-effect transistor 5 series connections are being supplied the collection utmost point of battery 1 and radio-frequency power amplifier or drained (the FET-amplifier uses drain electrode, and the BJT-amplifier uses the collection utmost point) between 9 (the Collector or Drain) between system power supply.
The magnitude of voltage of amplifier bias control circuit 7 meeting detection system power supply supply batteries 1.The voltage of supplying battery 1 when system power supply is when remaining on fixed value, regardless of the requirement size (regardless of the magnitude of voltage size of power controlling signal 6) of system for radio frequency power output, grid 2 voltages that amplifier bias control circuit 7 all can controlling filed effect transistor 5 remain on a fixed voltage value.But when system power supply was supplied the variation in voltage of battery 1, then the voltage of grid 2 voltages of amplifier bias control circuit 7 meeting controlling filed effect transistors 5 and power supply supply battery 1 was done the change of proportional linearity formula.Only this point promptly with the Poewr control method of RFMD patent have obviously with showing different.
Amplifier bias control circuit 7 also can detect the voltage difference between Vc 3 and the Va 1 simultaneously.The power controlling signal V that amplifier bias control circuit 7 uses this voltage difference and fundamental frequency system to be provided
APCThe magnitude of voltage of 6 (analog signals) relatively, thereby adjust the base stage or grid 8 (the FET-amplifier use grid of radio-frequency power amplifier, the BJT-amplifier uses base stage) size of voltage, thereby reach control for the precision of radio frequency power output size.
Total, know-why of the present invention is to utilize the voltage difference between Vc 3 and the Va 1 to change along with the size of the power output of radio-frequency power amplifier.Fig. 6 promptly shows utilization technical pattern of the present invention, uses the 3.4V battery, curve Figure 42 of the Vc 3 corresponding Vd 8 that measured.Its transverse axis 44 is to represent Vd 8, and its longitudinal axis 43 then is to represent Vc 3.The magnitude of voltage that changes Vd 8 can change the size of the power output of radio-frequency power amplifier, also can change the magnitude of voltage of Vc 3 simultaneously.Work as variation of temperature, the difference of assembly ... etc. factor, cause the power output and the power controlling signal V of radio-frequency power amplifier
APCThe set power output set point of 6 representatives during difference, also can cause (Vc-Va) 41 and power controlling signal V to some extent at the same time
APCSet (Vc-Va) set point of 6 representatives is difference to some extent, 11 voltages that can utilize this difference to adjust Vd 8 of difference comparator, it promptly corresponds to the power output of adjusting radio-frequency power amplifier, thereby realizes the requirement for the precision of radio frequency power output.
The reference numeral explanation
Fig. 1 is the schematic diagram of the design circuit method of the power output controller of the control amplifier radio frequency power output of the present invention's use.
Fig. 2 is the design circuit schematic diagram of the power control of power sensing (powers ensing) formula.
Fig. 3 is the design circuit schematic diagram of the power control of current sense (current sensing) formula.
Fig. 4 is the design circuit schematic diagram of RFMD patent power control.
The claimed range of Fig. 5 GSM mobile handset radio frequency power output.
The curve chart of Fig. 6 Vc 3 corresponding Vd 8
The reference numeral explanation
| The voltage of 1 system power supply supply battery | The grid of 2 field-effect transistors |
| The collection level or the drain electrode of 3 radio-frequency power amplifiers | The ground level of 4 radio-frequency power amplifiers or |
| 5 field-effect transistors | The controlling signal of the control output radio-frequency power size that 6 fundamental frequency systems provide |
| 7 amplifier bias control circuits | The ground level of 8 radio-frequency power amplifiers or grid |
| The collection level or the drain electrode of 9 radio- |
10 radio frequency power output controllers |
| 11 (Vc-Va) difference comparator |
| The voltage of 15 system power supplies supply battery | The collection level of 16 radio-frequency power amplifiers |
| The ground level of 17 radio- |
18 directional couplers |
| 19V APC: the controlling signal of the control output radio-frequency power size that cell phone system provides | The control circuit of 20 power sensings |
| 21R SENSE: resistance | The control circuit of 22 current senses |
| 23V APC: the controlling signal of the control output radio-frequency power size that cell phone system provides | The collection level of 24 radio-frequency power amplifiers |
| The ground level of 25 radio-frequency power amplifiers | 31TX_Enable: cell phone system provides " can transmit " controlling signal |
| 32V APC: the controlling signal of the control output radio-frequency power size that cell phone system provides | 33V GSThe control circuit of bias voltage |
| 34V GS: the grid level of field-effect transistor is to the voltage of source class | The collection level of 35 radio-frequency power amplifiers |
| The ground level of 36 radio-frequency power amplifiers | The difference value of 41 (Vc-Va) |
| The curve of the corresponding Vd of 42Vc | The longitudinal axis of 43 curve charts |
| The transverse axis of 43 curve charts |
Embodiment
According to the present invention, can make the power control integrated circuit of the function of radio frequency power output size, this power control integrated circuit with control radio-frequency power amplifier:
1. use a field-effect transistor 5, field-effect transistor 5 series connections are being supplied between the collection level 9 of battery 1 and radio-frequency power amplifier between system power supply.Then the Va 1 of field-effect transistor and the voltage difference between the Vc3 can be along with the sizes of the power output of radio-frequency power amplifier and are changed.
2. in conjunction with field-effect transistor 5, design power control integrated circuit 10.Power control integrated circuit contains amplifier bias control circuit 7, the magnitude of voltage of control circuit 7 meeting detection system power supply supply batteries 1.The voltage of supplying battery when system power supply is when remaining on fixed value, regardless of the requirement size (regardless of the magnitude of voltage size of power controlling signal 6) of system for radio frequency power output, control circuit 7 all can the controlling filed effect transistor grid voltage 2, make it remain on a fixed voltage value.But when system power supply was supplied the variation in voltage of battery 1, then amplifier bias control circuit 7 was understood the grid voltage 2 of controlling filed effect transistors 5, and the voltage 1 that makes itself and power supply supply battery is done the change of proportional linearity formula.The Va 1 of the control meeting controlling filed effect transistor of grid voltage and the voltage difference between the Vc 3 make that this voltage difference of representing the radio frequency power output size can to supply voltage 1 change and the change of battery too many along with power supply.
Amplifier bias control circuit 7 does with the voltage difference between Va 1 and the Vc 3 that gain is amplified then and the magnitude of voltage of power controlling signal 6 compare (or with power controlling signal 6 do decay then and the voltage difference between Va 1 and the Vc 3 compare).When the magnitude of voltage of the voltage difference specific power controlling signal 6 after changing is big, then increase the bias voltage 4 of amplifier, make amplifier increase radio frequency power output.Amplifier bias control circuit 7 will increase the radio frequency power output of amplifier, and the voltage difference after conversion and the magnitude of voltage of power controlling signal 6 reach equivalent.The magnitude of voltage hour of the voltage difference specific power controlling signal 6 after conversion, then the bias voltage 4 of step-down amplifier makes amplifier reduce radio frequency power output.Amplifier bias control circuit 7 is with the radio frequency power output of step-down amplifier, and the voltage difference after conversion and the magnitude of voltage of power controlling signal 6 reach equivalent.
Claims (1)
1. radio frequency power output controller, be used in the matching RF power amplifier, control its radio frequency power output size, the circuit design method of control integrated circuit, this integrated circuit comprises a field-effect transistor, when using, the leakage level and the source class of field-effect transistor will be by series connection supplying between the collection level or drain electrode of battery and radio-frequency power amplifier between system power supply outside integrated circuit; One input port, this input port being connected to the fundamental frequency system when using provides and gives integrated circuit, represents the power controlling signal of control amplifier radio frequency power output size; One output port is connected to this output port the ground level or the grid of radio frequency amplifier when using; With a control circuit, this circuit design method comprises:
Control circuit makes the leakage level of field-effect transistors and the voltage difference signal between the source class, this voltage difference is done gain or decay conversion, the control circuit and the conversion fundamental frequency system that can gain or decay provide and give integrated circuit, represent the power controlling signal of control amplifier radio frequency power output size, the magnitude of voltage of two signals after the conversion is made voltage difference relatively, when voltage difference when being non-vanishing, integrated circuit can be via the ground level that changes amplifier or the voltage of grid, thereby radio frequency power output and the leakage level of field-effect transistor and the signal between the source class of change amplifier, when the voltage difference of voltage difference comparison is zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100032261A CN101499782A (en) | 2008-01-28 | 2008-01-28 | Output power controlling circuit design method for radio frequency power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100032261A CN101499782A (en) | 2008-01-28 | 2008-01-28 | Output power controlling circuit design method for radio frequency power amplifier |
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| CN101499782A true CN101499782A (en) | 2009-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100032261A Pending CN101499782A (en) | 2008-01-28 | 2008-01-28 | Output power controlling circuit design method for radio frequency power amplifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354242A (en) * | 2011-08-02 | 2012-02-15 | 唯捷创芯(天津)电子技术有限公司 | Power control circuit |
| CN102769433A (en) * | 2012-06-06 | 2012-11-07 | 广州慧智微电子有限公司 | Radio-frequency power amplifier power control circuit utilizing NMOS (N-channel metal oxide semiconductor field-effect transistor) regulating tube |
| CN109462382A (en) * | 2018-10-26 | 2019-03-12 | 京信通信系统（中国）有限公司 | Power amplifying system, power investigating method, device and base station equipment |
-
2008
- 2008-01-28 CN CNA2008100032261A patent/CN101499782A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354242A (en) * | 2011-08-02 | 2012-02-15 | 唯捷创芯(天津)电子技术有限公司 | Power control circuit |
| CN102769433A (en) * | 2012-06-06 | 2012-11-07 | 广州慧智微电子有限公司 | Radio-frequency power amplifier power control circuit utilizing NMOS (N-channel metal oxide semiconductor field-effect transistor) regulating tube |
| CN102769433B (en) * | 2012-06-06 | 2016-04-27 | 广州慧智微电子有限公司 | Adopt the radio-frequency power amplifier power control circuit of NMOS Correctional tube |
| CN109462382A (en) * | 2018-10-26 | 2019-03-12 | 京信通信系统（中国）有限公司 | Power amplifying system, power investigating method, device and base station equipment |
| CN109462382B (en) * | 2018-10-26 | 2022-07-29 | 京信网络系统股份有限公司 | Power amplification system, power measurement and control method, device and base station equipment |
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Application publication date: 20090805 |