Patent · US Active

Methods and circuits for detuning a filter and matching network at the output of a power amplifier

US8731490B2 · kind B2 · utility

3Cited by
57References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 2, 2012
Grant dateMay 20, 2014
Priority date—
Expiry dateOct 2, 2032

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04B1/0483
  • WIPO fieldTelecommunications
  • WIPO sectorElectrical engineering

Abstract

In transmitter modules or power amplifier (PA) modules there is at least a possible path for a second and even a third harmonic of a low band to crossover unfiltered into the high band path and reach the antenna and hence cross band isolation is necessary. Forward isolation is necessary in order to limit the input crossing over the PAs into the antenna port. According to the methods and the circuits such cross band isolation and forward isolation is improved by detuning the filter and matching network at the output of the PA. The circuit comprises a trap at the harmonic frequencies of the low band thereby at least reducing the impacts of the cross band and forward isolation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.