  mm-wave emission from Active Galactic Nuclei (AGN) may hold the key to
understanding the physical origin of their radio cores. The correlation between
radio/mm and X-ray luminosity may suggest a similar physical origin of the two
sources. Since synchrotron self absorption decreases with frequency, mm-waves
probe smaller length scales than cm-waves. We report on 100 GHz (3 mm)
observations with CARMA of 26 AGNs selected from the hard X-ray Swift/BAT
survey. 20/26 targets were detected at 100 GHz down to the 1 mJy (3 $\sigma$)
sensitivity, which corresponds to optically thick synchrotron source sizes of
10$^{-4}$ - 10$^{-3}$ pc). Most sources show a 100 GHz flux excess with respect
to the spectral slope extrapolated from low frequencies. This mm spectral
component likely originates from smaller scales than the few-GHz emission. The
measured mm sources lie roughly around the L$_{mm}$ (100 GHz) $\sim$ 10$^{-1}$
L$_{X}$ (2-10 keV) relation, similar to a few previously published X-ray
selected sources, and hinting perhaps at a common coronal origin.
