Consolidated acoustic transformer in transmission chain

Patent metadata

Field	Value
Publication number	US-12375064-B2
Application number	US-202318241519-A
Country	US
Kind code	B2
Filing date	Sep 1, 2023
Priority date	Dec 13, 2022
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

An acoustic transformer in a transmitter chain is disclosed. In one aspect, a differential power amplifier may produce a differential signal that is provided to an acoustic transformer coupled to an acoustic filter. The acoustic transformer provides a single-ended output signal for use by the acoustic filter. To facilitate operation in multiple bands, multiple acoustic transformer-acoustic filter pairs may be provided with a switching network used to route the amplified signal to the appropriate transformer-filter pair.

First claim

What is claimed is:

1. A transmitter chain comprising:
a power amplifier having a differential output comprising a first output line and a second output line;
an acoustic transformer directly coupled to the first output line and the second output line and comprising a single-ended output; and
an acoustic filter comprising a tunable ferroelectric network element.

2. The transmitter chain of claim 1 , wherein the acoustic transformer is configured to sum currents for the single-ended output.

3. The transmitter chain of claim 1 , wherein the acoustic transformer is configured to sum voltages for the single-ended output.

4. The transmitter chain of claim 1 , wherein the acoustic transformer is configured to provide out-of-band cancelation.

5. The transmitter chain of claim 1 , wherein the acoustic filter comprises a ladder filter.

6. The transmitter chain of claim 1 , further comprising a first inductor coupling the first output line to a supply bias voltage and a second inductor coupling the second output line to the supply bias voltage.

7. The transmitter chain of claim 1 , further comprising a pair of switches positioned between the output lines and the acoustic transformer.

8. The transmitter chain of claim 7 , further comprising a second acoustic transformer and a second acoustic filter coupled to the second acoustic transformer, the second acoustic transformer switchably coupled to the first output line and the second output line through a second pair of switches.

9. The transmitter chain of claim 8 , wherein the second acoustic filter is configured to provide a passband for a frequency range different than a passband of the acoustic filter.

10. The transmitter chain of claim 7 , wherein the pair of switches comprises microelectromechanical system (MEMS) switches.

11. A transmitter chain comprising:
a power amplifier having a differential output comprising a first output line and a second output line;
a first inductor coupled to the first output line and configured to be coupled to a supply bias voltage;
a second inductor coupled to the second output line and configured to be coupled to the supply voltage;
an acoustic transformer coupled to the first output line through a third inductor and coupled to the second output line through a fourth inductor and comprising a single-ended output; and
an acoustic filter comprising a tunable ferroelectric network element.

12. A wireless communication device comprising:
a transmitter chain comprising:
a power amplifier having a differential output comprising a first output line and a second output line;
an acoustic transformer directly coupled to the first output line and the second output line and comprising a single-ended output; and
an acoustic filter comprising a tunable ferroelectric network element.

Assignees

• Qorvo Us Inc

Inventors

• Scott Baker
• Khlat Nadim

Classifications

• H04B10/50

  Transmitters · CPC title

• H03H9/525

  for microelectro-mechanical filters · CPC title

• H03H9/6483

  Ladder SAW filters · CPC title

• H03H9/70 Primary

  Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source · CPC title