Back to results
US 9,020,451 B2Granted
Programmable RF notch filter for envelope tracking
AssigneeRF Micro Devices, Inc.
InventorNadim Khlat
Life of this patent
Estimating the term…
Abstract
A parallel amplifier, a switching supply, and a radio frequency (RF) notch filter are disclosed. The parallel amplifier has a parallel amplifier output, such that the switching supply is coupled to the parallel amplifier output. Further, the RF notch filter is coupled between the parallel amplifier output and a ground. The RF notch filter has a selectable notch frequency, which is based on an RF duplex frequency.
Claims22
Circuitry comprising:
- a parallel amplifier having a parallel amplifier output and configured to regulate a voltage of a first power supply output signal based on a voltage setpoint;
- a switching supply coupled to the parallel amplifier output;
- and
- a radio frequency (RF) notch filter having a selectable notch frequency and coupled between the parallel amplifier output and a ground, wherein the selectable notch frequency is based on an RF duplex frequency.
1 more element
A method comprising:
- providing a first envelope power supply signal to a radio frequency (RF) power amplifier (PA);
- at least partially envelope tracking an RF transmit signal;
- receiving and amplifying an RF input signal to provide the RF transmit signal using the first envelope power supply signal;
- providing an RF receive signal, which has an RF receive frequency;
- and
- RF notch filtering the first envelope power supply signal to reduce noise at the RF receive frequency.
3 more elements
Dependencies are inferred from the claim text.