Programmable RF notch filter for envelope tracking
First Claim
Patent Images
1. 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.
2 Assignments
0 Petitions
Accused Products
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.
-
Citations
22 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. 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.
-
Specification