Abstract
Recent progress in high-current photodiodes now makes it possible to
efficiently generate over +26
dBm of RF power directly from the output of a photodiode. This paper describes
two photodetector designs which demonstrate excellent large- and small-signal
behavior. Maximum small-signal compression currents have increased to over
700 mA at 300 MHz. Output RF power amplifier stage efficiencies of over 45%
(class AB operation) and 35% (class A) have been achieved from 0.3 to 6GHz
with RF power outputs over +26
dBm. The linearity figure of merit (LFOM) is also shown to be greater than
50, leading to the possibility of implementing very high linearity RF power
amplifiers in the future.
© 2008 IEEE
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