Amplifier linearization using non-standard feedback
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H03F-003/68
H03F-001/36
H03F-001/32
H03F-001/02
H03F-003/193
H03F-003/21
H03F-003/24
출원번호
US-0131131
(2011-07-11)
등록번호
US-9024690
(2015-05-05)
국제출원번호
PCT/CA2011/050421
(2011-07-11)
§371/§102 date
20140106
(20140106)
국제공개번호
WO2013/006943
(2013-01-17)
발명자
/ 주소
Widdowson, Scott
Bowles, Gregory
Fuller, Arthur
출원인 / 주소
RPX Clearinghouse LLC
대리인 / 주소
Conley Rose, P.C.
인용정보
피인용 횟수 :
1인용 특허 :
10
초록▼
An amplification unit is provided. The amplification unit, comprises a first amplifier, a second amplifier, a first sensor, a first predistortion component, and a signal combiner. The first amplifier amplifies a first signal to produce a second signal. The first sensor produces a third signal based
An amplification unit is provided. The amplification unit, comprises a first amplifier, a second amplifier, a first sensor, a first predistortion component, and a signal combiner. The first amplifier amplifies a first signal to produce a second signal. The first sensor produces a third signal based on the second signal. The second amplifier turns on and to amplifies a fourth signal to produce a fifth signal when the amplitude of the fourth signal exceeds a threshold amplitude and turns off when the amplitude of the fourth signal is less than the threshold amplitude. The first predistortion component produces the first signal based on a first input signal, based on the third signal, and based on an on-off state of the second amplifier. The signal combiner produces an output of the amplification unit based on the second signal and the fifth signal.
대표청구항▼
1. An amplification unit, comprising: a first amplifier, wherein the first amplifier is operable to amplify a first signal to produce a second signal;a first sensor, wherein the first sensor is operable to produce a third signal based on the second signal;a second amplifier, wherein the second ampli
1. An amplification unit, comprising: a first amplifier, wherein the first amplifier is operable to amplify a first signal to produce a second signal;a first sensor, wherein the first sensor is operable to produce a third signal based on the second signal;a second amplifier, wherein the second amplifier is operable to turn on and to amplify a fourth signal to produce a fifth signal when the amplitude of the fourth signal exceeds a threshold amplitude and to turn off when the amplitude of the fourth signal is less than the threshold amplitude;a first predistortion component, wherein the first predistortion component is operable to produce the first signal based on a first input signal, based on the third signal, and based on an on-off state of the second amplifier; anda signal combiner, wherein the signal combiner is operable to produce an output of the amplification unit based on the second signal and the fifth signal. 2. The amplification unit of claim 1, wherein the second amplifier is biased as a Class B amplifier. 3. The amplification unit of claim 1, wherein the first sensor is a radio frequency coupler located between an output of the first amplifier and the signal combiner. 4. The amplification unit of claim 1, wherein the first sensor is a current monitor located between an output of the first amplifier and the signal combiner, wherein the first sensor produces the third signal based on a current output by the first amplifier. 5. The amplification unit of claim 1, wherein the amplification unit comprises a Doherty amplifier. 6. The amplification unit of claim 5, further comprising: a second sensor, wherein the second sensor is operable to produce a sixth signal based on the fifth signal;a second predistortion component, wherein the second predistortion component is operable to produce the fourth signal based on a second input signal and based on the sixth signal. 7. The amplification unit of claim 1, wherein the first amplifier is formed from at least one semiconductor having a first material composition and belonging to a first semiconductor family;wherein the second amplifier is formed from at least one semiconductor having a second material composition and belonging to a second semiconductor family; andwherein at least one of the first material composition is different from the second material composition and the first semiconductor family is different from the second semiconductor family. 8. An amplification unit, comprising: a first amplifier that receives a first signal and outputs a second signal, wherein the first amplifier amplifies the first signal to produce the second signal;a sensor that senses the second signal and outputs a third signal, wherein the third signal is based on the second signal;a second amplifier that receives a fourth signal and that outputs a fifth signal, wherein the second amplifier amplifies the fourth signal to produce the fifth signal;a predistortion component that determines predistortion values based at least in part on the third signal and that outputs the first signal based on a first input signal and the predistortion values; anda signal combiner, wherein the signal combiner outputs a sixth signal based on the second signal and based on the fifth signal, wherein the sensor is located between the output of the first amplifier and the signal combiner. 9. The amplification unit of claim 8, further comprising a phase shift component that phase shifts the second signal, wherein the phase shift component is located between the sensor and the signal combiner. 10. The amplification unit of claim 8, wherein the first signal and the fourth signal are substantially constant amplitude signals. 11. The amplification unit of claim 8, wherein the predistortion component determines the predistortion values further based on an operating state of the second amplifier. 12. The amplification unit of claim 11, wherein the third signal indicates a current in an output transistor of the first amplifier, and wherein the predistortion component determines the predistortion values based on converting the current indication of the third signal to a voltage indication, wherein converting the current indication to a voltage indication is based on a first known output impedance seen by the first amplifier during a first operating state of the second amplifier and based on a second known output impedance seen by the first amplifier during a second operating state of the second amplifier. 13. The amplification unit of claim 8, wherein the predistortion component comprises an adapter component that determines a plurality of predistortion values and a correction component that modifies the first input signal based on at least one predistortion value selected from the plurality of predistortion values, where the at least one predistortion value is selected from the plurality of predistortion values based on the first input signal. 14. The amplification unit of claim 13, wherein the correction component modifies the first input signal based on a predistortion gain value and based on a predistortion phase value selected from the plurality of predistortion values. 15. A method of amplifying electronic signals to produce a radio frequency output, comprising: amplifying a first input to produce an output of a second amplifier, wherein the second amplifier operates in an on state or in an off state;determining a first predistortion based on an output of a first amplifier and based on whether the second amplifier is operating in the on state or in the off state;amplifying a second input to produce an output of a first amplifier, wherein the second input is based on a third input and based on the first predistortion; andcombining the output of the first amplifier and the output of the second amplifier to produce a radio frequency output. 16. The method of claim 15, wherein the first predistortion is determined based on a first output impedance experienced by the first amplifier when the second amplifier operates in the on state and based on a second output impedance experienced by the first amplifier when the second amplifier operates in the off state. 17. The method of claim 16, wherein the first predistortion is determined based on the output of the first amplifier upstream of where the output of the first amplifier is combined with the output of the second amplifier to produce the radio frequency output. 18. The method of claim 15, wherein the first amplifier and the second amplifier are arranged in a Doherty amplifier configuration. 19. The method of claim 15, wherein determining the first predistortion is further based on the third input. 20. The method of claim 19, further comprising determining a second predistortion based on the output of the second amplifier and based on the first input, wherein the second amplifier further amplifies the second predistortion when producing the output of the second amplifier.
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이 특허에 인용된 특허 (10)
Ahmed, Abdulrhman M. S.; Hart, Paul R; Embar, Ramanujam Shinidhi, Amplifier calibration.
Zahn Rudolf (Markdorf DEX) Schroeder Hans W. (Immenstaad DEX) Borgwardt Christian (Immenstaad DEX) Braig Albert (Markdorf DEX) Helwig Gunter (Daisendorf DEX) Boukamp Joachim (Markdorf DEX) Bender Osw, Microstrip antenna.
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