IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0297951
(2011-11-16)
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등록번호 |
US-8421548
(2013-04-16)
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발명자
/ 주소 |
- Spears, John H.
- Smith, Wayne E.
- Sui, Chenggang
- Zhu, Yongfei
|
출원인 / 주소 |
- Research In Motion RF, Inc.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
49 인용 특허 :
178 |
초록
▼
Methods for generating a look-up table relating a plurality of complex reflection coefficients to a plurality of matched states for a tunable matching network. Typical steps include measuring a plurality of complex reflection coefficients resulting from a plurality of impedance loads while the tunab
Methods for generating a look-up table relating a plurality of complex reflection coefficients to a plurality of matched states for a tunable matching network. Typical steps include measuring a plurality of complex reflection coefficients resulting from a plurality of impedance loads while the tunable matching network is in a predetermined state, determining a plurality of matched states for the plurality of impedance loads, with a matched state determined for each of the plurality of impedance loads and providing the determined matched states as a look-up table. A further step is interpolating the measured complex reflection coefficients and the determined matching states into a set of complex reflection coefficients with predetermined step sizes.
대표청구항
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1. An apparatus comprising a controller which when executing computer instructions is operable to adaptively tune a tunable impedance matching network with a lookup table, the lookup table containing sets of parameters corresponding to matched states for the tunable impedance matching network, said
1. An apparatus comprising a controller which when executing computer instructions is operable to adaptively tune a tunable impedance matching network with a lookup table, the lookup table containing sets of parameters corresponding to matched states for the tunable impedance matching network, said controller being operable for: selecting a parameter from the group consisting of complex reflection coefficients, current drain, incident power, reflected power, control setting of the tunable matching network, temperature, input power level, reliability considerations and linearity considerations;determining the closest match to the selected parameter in the lookup table;using the closest match to the selected parameter in the lookup table to tune the tunable impedance matching network, wherein the tunable impedance matching network includes voltage, variable capacitors, wherein the voltage variable capacitors are ferroelectric capacitors; andcontrolling the ferroelectric capacitors with digital-to-analog converters. 2. The apparatus of claim 1, wherein the controller is operable for: selecting the parameter to minimize tolerance variations based upon temperature coefficient, component tolerance or tolerance over time. 3. The apparatus of claim 1, wherein the ferroelectric capacitors are first and second ferroelectric capacitors that are connected with first and second digital-to-analog converters of the digital-to-analog converters, respectively. 4. The apparatus of claim 1, wherein the tunable impedance matching network includes a rectifier, and an analog-to-digital converter, wherein the rectifier provides a rectified value of a forward RF power to the analog-to-digital converter, and wherein the analog-to-digital converter provides a digital signal representing the rectified value to the processor. 5. The apparatus of claim 1, wherein the tunable impedance matching network includes a rectifier, and an analog-to-digital converter, wherein the rectifier provides a rectified value of a reverse RF power to the analog-to-digital converter, and wherein the analog-to-digital converter provides a digital signal representing the rectified value to the processor. 6. A communication device comprising: a memory to store a lookup table and computer instructions, wherein the lookup table includes sets of parameters corresponding to matched states for the tunable impedance matching network;a tunable impedance matching network comprising a ferroelectric capacitor;a digital-to-analog converter; anda controller coupled with the memory, the tunable impedance matching network and the analog-to-digital converter, wherein the controller, responsive to executing the computer instructions, performs operations comprising: selecting a parameter from the group consisting of complex reflection coefficients, current drain, incident power, reflected power, control setting of the tunable matching network, temperature, input power level, reliability considerations and linearity considerations;determining the closest match to the selected parameter in the lookup table;using the closest match to the selected parameter in the lookup table to tune the tunable impedance matching network; andcontrolling the ferroelectric capacitor with the digital-to-analog converter. 7. The communication device of claim 6, wherein the parameter is selected to minimize tolerance variations based upon temperature coefficient. 8. The communication device of claim 6, wherein the parameter is selected to minimize tolerance variations based upon component tolerance. 9. The communication device of claim 6, wherein the parameter is selected to minimize tolerance variations based upon tolerance over time. 10. The communication device of claim 6, wherein the tunable impedance matching network includes a rectifier, and an analog-to-digital converter, wherein the rectifier provides a rectified value of a forward RF power to the analog-to-digital converter, and wherein the analog-to-digital converter provides a digital signal representing the rectified value to the controller. 11. The communication device of claim 6, wherein the tunable impedance matching network includes a rectifier, and an analog-to-digital converter, wherein the rectifier provides a rectified value of a reverse RF power to the analog-to-digital converter, and wherein the analog-to-digital converter provides a digital signal representing the rectified value to the controller. 12. A non-transitory computer-readable storage medium comprising computer instructions for adaptively tuning a tunable impedance matching network with a lookup table, the lookup table containing sets of parameters corresponding to matched states for the tunable impedance matching network, the computer instructions responsive to being executed by a processor cause the processor to perform operations comprising: selecting a parameter from the group consisting of complex reflection coefficients, current drain, incident power, reflected power, control setting of the tunable matching network, temperature, input power level, reliability considerations and linearity considerations;determining the closest match to the selected parameter in the lookup table;using the closest match to the selected parameter in the lookup table to tune the tunable impedance matching network, wherein the tunable impedance matching network includes voltage variable capacitors, wherein the voltage variable capacitors ace ferroelectric capacitors; andcontrolling the ferroelectric capacitors with digital-to-analog converters. 13. The non-transitory computer-readable storage medium of claim 12, wherein the computer instructions responsive to being executed by the processor cause the processor to perform operations comprising selecting the parameter to minimize tolerance variations based upon temperature coefficient. 14. The non-transitory computer-readable storage medium of claim 12, wherein the computer instructions responsive to being executed by the processor cause the processor to perform operations comprising selecting the parameter to minimize tolerance variations based upon component tolerance. 15. The non-transitory computer-readable storage medium of claim 12, wherein the computer instructions responsive to being executed by the processor cause the processor to perform operations comprising selecting the parameter to minimize tolerance variations based upon tolerance over time.
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