  Photonic integration, advanced functionality, reconfigurability, and high RF
performance are key features in integrated microwave photonic systems that are
still difficult to achieve simultaneously. In this work, we demonstrate an
integrated microwave photonic circuit that can be reconfigured for two distinct
RF functions, namely, a tunable notch filter and a phase shifter. We achieved
$>$50dB high-extinction notch filtering over 6-16 GHz and 2$\pi$ continuously
tunable phase shifting over 12-20 GHz frequencies. At the same time, we
implemented an on-chip linearization technique to achieve a spurious-free
dynamic range of more than 120$\rm{dB}\cdot \rm{Hz}^{4/5}$ for both functions.
Our work combines multi-functionality and linearization in one photonic
integrated circuit, and paves the way to reconfigurable RF photonic front-ends
with very high performance.
