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A Planar Balanced Approach to Increase Transmitter Linearity

  • 2013-07-08
  • 191.04KB
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A Planar Balanced Approach to Increase Transmitter Linearity ABSTRACT

The TI TRF1123 MMIC transmitter chip is a highly linear power amplifier with digital

gain control, mute control, and output power detection for use in MMDS/MDS/WCS

applications. With a typical P1dB of 31 dBm and a third-order intercept point of 46 dBm,

the TRF1123 makes an excellent output stage for communication systems, particularly

those that employ high-order modulation schemes such as 64 QAM and OFDM.

In applications with higher output power and/or higher linearity requirements, two

TRF1123s can be combined in a balanced configuration to increase the P1dB and

third-order intercept points. An ideal balanced configuration provides low input and

output VSWR in addition to a 3 dB improvement of the power and linearity

performance. Typical microstrip balanced power combiners use a Lange type combiner,

which, although effective, has the disadvantage of a non-planar implementation.

This application note documents a novel design approach for a planar, balanced power

combiner and presents results using the TRF1123 transmitter chip.

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