Front end module with tone injection

Patent metadata

Field	Value
Publication number	US-9106416-B2
Application number	US-201314012098-A
Country	US
Kind code	B2
Filing date	Aug 28, 2013
Priority date	Jun 3, 2010
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

A radio front end includes a power amplifier, a tone injection module, a duplexer, a balancing network, and a processor. The tone injection module is operable, in a first mode, to produce a tone having a carrier frequency that is substantially similar to a carrier frequency of an inbound wireless signal. The duplexer is operable, in the first mode, to provide electrical isolation between the outbound wireless signal and a combination signal of the tone and inbound wireless signal and is operable, in a second mode, to provide electrical isolation between the outbound wireless signal and the inbound wireless signal. The processor is operable to determine an amplitude of a tone component of the combination signal; correlate the amplitude of the tone component to an inbound frequency band isolation; and adjust baseband processing of a down converted representation of the combination signal based on the inbound frequency band isolation.

First claim

What is claimed is:

1. A radio front end comprising:
a power amplifier configured to amplify an up-converted signal to produce an outbound wireless signal;
tone injection circuitry configured, in a first mode, to produce a tone having a frequency that is substantially similar to a carrier frequency of an inbound wireless signal;
a duplexer coupled to an antenna, the power amplifier, and the tone injection circuitry, and configured to:
in the first mode, provide electrical iso…

Assignees

• Broadcom Corp

Inventors

• Mikhemar Mohyee
• Darabi Hooman

Classifications

• H03H7/40

  Electricity · mapped topic

• H04B1/581

  Electricity · mapped topic

• H04L5/1461 Primary

  Electricity · mapped topic

• H03F2200/537

  Electricity · mapped topic

• H04B1/18 Primary

  Electricity · mapped topic