AMPLIFICATION SYSTEM WITH DIFFERENTIAL ENVELOPE-BASED BIAS
First Claim
1. An amplification system comprising:
- a first differential amplifier configured to receive a differential envelope signal and to provide a first processed envelope signal;
a second differential amplifier configured to receive the differential envelope signal and to provide a second processed envelope signal;
an envelope tracker configured to receive the first processed envelope signal and to provide an envelope tracking signal; and
a cascode amplifier having a first transistor and a second transistor configured to generate an output RF signal that is an amplified version of an input RF signal, the first transistor biased by a combination of a biasing signal and the input RF signal, the second transistor biased by the second processed envelope signal, the second transistor configured to receive an envelope-based supply voltage that is a combination of the envelope tracking signal and a supply voltage.
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Abstract
Disclosed herein are amplification systems that are dynamically biased based on a signal indicative of differential envelope of an input radio-frequency (RF) signal being amplified. The amplification systems include a cascode amplifier configured to amplify the RF signal to generate an output RF signal when one of the transistors of the cascode amplifier is biased by a combination of the input RF signal and a biasing signal while the other transistor of the cascode amplifier is biased by a processed differential envelope signal. The cascode amplifier also receives a combination of a processed differential envelope signal and a supply voltage to generate the output RF signal. The biasing signal can improve or enhance the linearity of amplification systems.
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Citations
20 Claims
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1. An amplification system comprising:
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a first differential amplifier configured to receive a differential envelope signal and to provide a first processed envelope signal; a second differential amplifier configured to receive the differential envelope signal and to provide a second processed envelope signal; an envelope tracker configured to receive the first processed envelope signal and to provide an envelope tracking signal; and a cascode amplifier having a first transistor and a second transistor configured to generate an output RF signal that is an amplified version of an input RF signal, the first transistor biased by a combination of a biasing signal and the input RF signal, the second transistor biased by the second processed envelope signal, the second transistor configured to receive an envelope-based supply voltage that is a combination of the envelope tracking signal and a supply voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A radio-frequency (RF) module comprising:
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a packaging substrate configured to receive a plurality of components; and an amplification system implemented on the packaging substrate, the amplification system including a first differential amplifier configured to receive a differential envelope signal and to provide a first processed envelope signal;
a second differential amplifier configured to receive the differential envelope signal and to provide a second processed envelope signal;
an envelope tracker configured to receive the first processed envelope signal and to provide an envelope tracking signal; and
a cascode amplifier having a first transistor and a second transistor configured to generate an output RF signal that is an amplified version of an input RF signal, the first transistor biased by a combination of a biasing signal and the input RF signal, the second transistor biased by the second processed envelope signal, the second transistor configured to receive an envelope-based supply voltage that is a combination of the envelope tracking signal and a supply voltage. - View Dependent Claims (16, 17, 18)
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19. A wireless device comprising:
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a transceiver configured to generate a radio-frequency (RF) signal; a front-end module (FEM) in communication with the transceiver, the FEM including a packaging substrate configured to receive a plurality of components, the FEM further including an amplification system implemented on the packaging substrate, the amplification system including a first differential amplifier configured to receive a differential envelope signal and to provide a first processed envelope signal;
a second differential amplifier configured to receive the differential envelope signal and to provide a second processed envelope signal;
an envelope tracker configured to receive the first processed envelope signal and to provide an envelope tracking signal; and
a cascode amplifier having a first transistor and a second transistor configured to generate an output RF signal that is an amplified version of an input RF signal, the first transistor biased by a combination of a biasing signal and the input RF signal, the second transistor biased by the second processed envelope signal, the second transistor configured to receive an envelope-based supply voltage that is a combination of the envelope tracking signal and a supply voltage; andan antenna in communication with the FEM, the antenna configured to transmit the output RF signal received from the amplification system. - View Dependent Claims (20)
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Specification