Wide-bandwidth envelope tracking circuit
First Claim
1. A wide-bandwidth envelope tracking (ET) circuit comprising:
- a differential amplifier circuit comprising a first amplifier input and a second amplifier input, the differential amplifier circuit configured to;
receive a first input voltage and a first input current at the first amplifier input;
receive a second input voltage and a second input current at the second amplifier input; and
amplify a radio frequency (RF) signal based on the first input voltage, the first input current, the second input voltage, and the second input current;
a first tracker circuit comprising a first tracker output and configured to generate a first ET modulated voltage and a first current at the first tracker output;
a second tracker circuit comprising a second tracker output and configured to generate a second ET modulated voltage and a second current at the second tracker output; and
control circuitry configured to;
couple the first tracker output to the first amplifier input to provide the first ET modulated voltage and the first current to the differential amplifier circuit as the first input voltage and the first input current, respectively; and
couple the second tracker output to the second amplifier input to provide the second ET modulated voltage and the second current to the differential amplifier circuit as the second input voltage and the second input current, respectively.
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Accused Products
Abstract
A wide-bandwidth envelope tracking (ET) circuit is provided. In examples discussed herein, the wide-bandwidth ET circuit is configured to enable a differential amplifier circuit(s) to amplify a radio frequency (RF) signal(s) modulated at a wide-bandwidth (e.g., up to 160 MHz) without increasing power dissipation. Specifically, the wide-bandwidth ET circuit employs a pair of tracker circuits to concurrently provide ET modulated voltages and currents (e.g., direct current and/or alternating current) to the differential amplifier circuit(s) for amplifying the RF signal(s). For example, each of the tracker circuits can be configured to provide one-half (½) of the total current required by the differential amplifier circuit(s). Accordingly, the tracker circuits can be implemented with smaller output stages. As a result, the tracker circuits can supply the ET modulated voltages at a higher slew rate and reduced output impedance, thus helping to improve power dissipation in the wide-bandwidth ET circuit.
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Citations
20 Claims
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1. A wide-bandwidth envelope tracking (ET) circuit comprising:
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a differential amplifier circuit comprising a first amplifier input and a second amplifier input, the differential amplifier circuit configured to; receive a first input voltage and a first input current at the first amplifier input; receive a second input voltage and a second input current at the second amplifier input; and amplify a radio frequency (RF) signal based on the first input voltage, the first input current, the second input voltage, and the second input current; a first tracker circuit comprising a first tracker output and configured to generate a first ET modulated voltage and a first current at the first tracker output; a second tracker circuit comprising a second tracker output and configured to generate a second ET modulated voltage and a second current at the second tracker output; and control circuitry configured to; couple the first tracker output to the first amplifier input to provide the first ET modulated voltage and the first current to the differential amplifier circuit as the first input voltage and the first input current, respectively; and couple the second tracker output to the second amplifier input to provide the second ET modulated voltage and the second current to the differential amplifier circuit as the second input voltage and the second input current, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification