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Intel Corporation

Daniel Bjork

Mats Carlsson

Issy Kipnis

Jan Rapp

An output-impedance in a power amplifier is provided. A first transistor Qof a buffer stage is connected to a first side of a resistor Rand a second transistor Qto a second opposite side of the resistor R. The first transistor feeds a current Ito the second resistor Q. The current Iat the second transistor is copied and multiplied by a factor (n) to form an output current I, as (1+n)*I. The current Iis fed back to the first transistor and the output current Iis fed to a load resistor R.

Method of using integrated power amplifier

Briefly, in accordance with one or more embodiments, a dual mode power amplifier is capable of operating in either linear mode such as class A operation, or a non-linear mode such as class F operation. The power amplifier may be utilized in an RFID interrogator. The power amplifier may be biased to operate in a linear mode if the power amplifier is operating in a higher linearity mode, or may be biased to operate in a non-linear mode if the power amplifier is operating in a higher efficiency, lower power mode. The power amplifier may comprise two or more amplifiers coupled in parallel. A current mirror circuit may turn on more amplifiers if the power amplifier is operating in a higher power mode, and may turn on fewer amplifiers if the power amplifier is operating a lower power mode.

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Sollentuna, Sweden

Daniel Bjork