Controlling power with an output network
First Claim
Patent Images
1. An apparatus comprising:
- a first gain stage having an input to receive a first input signal and to output a first amplified signal;
a second gain stage having an input to receive a second input signal and to output a second amplified signal;
an output network coupled to the first and second gain stages, and wherein at least one of the first and second gain stages is to be placed into a low impedance state when inactive, the output network including a transformer having a first coil and a second coil, wherein the outputs of the first and second gain stages are coupled to the first coil; and
a coupling capacitor to couple the output of the second gain stage to the first coil, wherein the coupling capacitor is configured in shunt with the first coil when the second gain stage is in the low impedance state and is coupled in series with the first coil when the second gain stage is active.
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Abstract
In one embodiment, the present invention includes multiple gain stages and an output network coupled to the gain stages. Each of the gain stages can be independently controlled to amplify a radio frequency (RF) signal to an output power level for transmission from a mobile wireless device. When controlled to be inactive, at least one of the gain stages can be placed into a low impedance state.
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Citations
27 Claims
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1. An apparatus comprising:
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a first gain stage having an input to receive a first input signal and to output a first amplified signal; a second gain stage having an input to receive a second input signal and to output a second amplified signal; an output network coupled to the first and second gain stages, and wherein at least one of the first and second gain stages is to be placed into a low impedance state when inactive, the output network including a transformer having a first coil and a second coil, wherein the outputs of the first and second gain stages are coupled to the first coil; and a coupling capacitor to couple the output of the second gain stage to the first coil, wherein the coupling capacitor is configured in shunt with the first coil when the second gain stage is in the low impedance state and is coupled in series with the first coil when the second gain stage is active. - View Dependent Claims (2, 3, 4, 5)
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6. A power amplifier comprising:
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a first stage including a first pair of amplifiers to receive a first input signal and to output a first amplified signal; a second stage including a second pair of amplifiers to receive a second input signal and to output a second amplified signal; a first transformer having a first coil to receive the first amplified signal and a second coil to output the first amplified signal to an output load; and a second transformer having a third coil to receive the second amplified signal and a fourth coil to output the second amplified signal to the output load, the second transformer having a different turns ratio than the first transformer and wherein the turns ratio of the first transformer is greater than the turns ratio of the second transformer, wherein the first stage is a high power gain stage and the second stage is a low power gain stage. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. An integrated circuit comprising:
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a first gain stage having an input to receive a first input signal and to output a first amplified signal; a second gain stage having an input to receive a second input signal and to output a second amplified signal; a third gain stage having an input to receive a third input signal and to output a third amplified signal; and at least three transformers each coupled to a corresponding one of the first, second and third gain stages, wherein the first and second transformers each have substantially equal turns ratios and wherein each of the substantially equal turns ratios is greater than a turns ratio of the third transformer. - View Dependent Claims (15, 16, 17, 18)
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19. A power amplifier comprising:
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a first differential complementary amplifier stage to receive an input signal and to amplify the input signal to a first amplified output signal; a second differential complementary amplifier stage to receive the input signal and to amplify the input signal to a second amplified output signal; an output transformer coupled to receive the first amplified output signal or the second amplified output signal, depending on which of the first and second differential complementary amplifier stages is enabled, wherein a turns ratio of the output transformer is dependent upon which of the first and second differential complementary amplifier stages is enabled, and wherein the non-enabled differential complementary amplifier stage is placed into a high impedance state; and an input transformer having an input coil coupled to outputs of a driver stage and a pair of output coils each coupled to the first and second differential complementary amplifier stages, wherein the first differential complementary amplifier stage is switchably coupled to the pair of output coils. - View Dependent Claims (20, 21, 22)
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23. An integrated circuit comprising:
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a first gain stage having an input to receive a first input signal and to output a first amplified signal; a second gain stage having an input to receive a second input signal and to output a second amplified signal; a first transformer coupled to the first gain stage; and a second transformer coupled to the second gain stage, wherein the first and second transformers each have substantially equal first turns ratios and each of the first and second transformers include coils formed of inductors integrated on a complementary metal-oxide-semiconductor (CMOS) die of the integrated circuit including the first and second gain stages, and wherein the inductors are sized to manage inductance variation of a CMOS process on which the integrated circuit is fabricated. - View Dependent Claims (24, 25, 26, 27)
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Specification