Noise reduction for envelope tracking
First Claim
Patent Images
1. Circuitry comprising:
- a parallel amplifier having a feedback input and a parallel amplifier output;
a radio frequency (RF) trap coupled between the parallel amplifier output and a ground;
a switching supply comprising;
switching circuitry having a switching circuitry output; and
a first inductive element coupled between the switching circuitry output and the feedback input; and
a direct current (DC) power source adapted to provide a DC source signal to the parallel amplifier and the switching supply.
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Abstract
A direct current (DC)-DC converter, which includes a parallel amplifier, a radio frequency (RF) trap, and a switching supply, is disclosed. The switching supply includes switching circuitry and a first inductive element. The parallel amplifier has a feedback input and a parallel amplifier output. The switching circuitry has a switching circuitry output. The first inductive element is coupled between the switching circuitry output and the feedback input. The RF trap is coupled between the parallel amplifier output and a ground.
409 Citations
28 Claims
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1. Circuitry comprising:
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a parallel amplifier having a feedback input and a parallel amplifier output; a radio frequency (RF) trap coupled between the parallel amplifier output and a ground; a switching supply comprising; switching circuitry having a switching circuitry output; and a first inductive element coupled between the switching circuitry output and the feedback input; and a direct current (DC) power source adapted to provide a DC source signal to the parallel amplifier and the switching supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method comprising:
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providing a DC source signal to a parallel amplifier and a switching supply circuitry; partially providing a first power supply output signal via a first inductive element inside the switching supply circuitry; partially providing the first power supply output signal via a parallel amplifier output based on a voltage setpoint; regulating a voltage of the first power supply output signal received at a feedback input of the parallel amplifier; and filtering the first power supply output signal based on a frequency response of a radio frequency (RF) trap.
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Specification