  We present here the results of the first broadband simultaneous spectral and
temporal studies of the newly detected black hole binary MAXI J1820+070 as seen
by SXT and LAXPC on-board AstroSat.The observed combined spectra in the energy
range 0.7-80 keV were well modeled using disk black-body emission, thermal
Comptonization and a reflection component. The spectral analysis revealed that
the source was in its hard spectral state (Gamma=1.61) with a cool disk
(kTin=0.22 keV). We report the energy dependent time-lag and root mean squared
(rms) variability at different frequencies in the energy range 3-80 keV using
LAXPC data. We also modeled the flux variability using a single zone stochastic
propagation model to quantify the observed energy dependence of time-lag and
fractional rms variability and then compared the results with that of Cygnus
X-1. Additionally, we confirm the detection of a quasi-periodic oscillation
with the centroid frequency at 47.7 mHz.
