TUNABLE IMPEDANCE INVERTER FOR DOHERTY AMPLIFIER CIRCUIT
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United States of America Patent
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Issued Date -
Aug 11, 2011
app pub date -
Feb 8, 2010
filing date -
Feb 8, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A tunable impedance inverter is presented for a Doherty amplifier circuit having first and second amplifiers connected in parallel between an input circuit for receiving an input signal and an output circuit for supplying an output signal to a load. An impedance inverter is coupled between the first amplifier and the output circuit. The inverter has an input and an output and a tunable mechanical strip line of variable electrical length interposed between the input and the output. An adjuster adjusts the electrical length of the strip line. The adjuster adjustably varies the electrical length of said pathway to thereby adjust the center frequency of said output signal.
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