Apparatus and methods for wideband envelope tracking
First Claim
1. A wideband envelope tracking system comprising:
- a DC-to-DC converter configured to generate a regulated voltage based on a combined error current;
a first error amplifier configured to generate a first error current and a first output voltage based on a first envelope current;
a second error amplifier configured to generate a second error current and a second output voltage based on a second envelope current;
a first combiner configured to generate a first power amplifier supply voltage based on combining the regulated voltage and the first output voltage; and
an error current processing circuit configured to generate the combined error current based on combining a plurality of error currents including the first error current and the second error current.
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Abstract
Apparatus and methods for wideband envelope tracking systems are disclosed herein. In certain implementations, an envelope tracker includes a DC-to-DC converter, a current digital-to-analog converter (DAC), an error amplifier, a feedback circuit, and an AC combiner. The current DAC receives a digital envelope signal, and uses the digital envelope signal to generate an envelope current. The feedback circuit is connected between an output and an inverting input of the error amplifier, and the envelope current is provided to the error amplifier'"'"'s inverting input. Additionally, the AC combiner generates a power amplifier supply voltage by combining an output of the DC-to-DC converter and an output of the error amplifier.
104 Citations
20 Claims
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1. A wideband envelope tracking system comprising:
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a DC-to-DC converter configured to generate a regulated voltage based on a combined error current; a first error amplifier configured to generate a first error current and a first output voltage based on a first envelope current; a second error amplifier configured to generate a second error current and a second output voltage based on a second envelope current; a first combiner configured to generate a first power amplifier supply voltage based on combining the regulated voltage and the first output voltage; and an error current processing circuit configured to generate the combined error current based on combining a plurality of error currents including the first error current and the second error current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of wideband envelope tracking in a mobile device, the method comprising:
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generating a regulated voltage based on a combined error current using a DC-to-DC converter; generating a first error current and a first output voltage based on a first envelope current using a first error amplifier; generating a second error current and a second output voltage based on a second envelope current using a second error amplifier; combining the regulated voltage and the first output voltage to generate a first power amplifier supply voltage using a first combiner; and combining a plurality of error currents including the first error current and the second error current to generate the combined error current using an error current processing circuit. - View Dependent Claims (9, 10, 11, 12)
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13. A mobile device comprising:
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a first power amplifier configured to receive a first power amplifier supply voltage and to provide amplification to a first radio frequency signal; a DC-to-DC converter configured to generate a regulated voltage based on a combined error current; a first error amplifier configured to generate a first error current and a first output voltage based on a first envelope current that changes based on an envelope of the first radio frequency signal; a second error amplifier configured to generate a second error current and a second output voltage based on a second envelope current; a first combiner configured to generate the first power amplifier supply voltage based on combining the regulated voltage and the first output voltage; and an error current processing circuit configured to generate the combined error current based on combining a plurality of error currents including the first error current and the second error current. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification