  For the first time, simultaneous broadband spectral and timing study of the
atoll source 4U 1705-44 was performed using AstroSat Soft X-ray Telescope (SXT)
and Large Area X-ray Proportional Counter (LAXPC) data (0.8-70 keV). Based on
the HID, the source was in the soft banana state during these observations.
Spectral modeling was performed using the full reflection framework and an
inner disk radii of 14 Rg was obtained. A hard powerlaw tail was noticed in the
soft state and hot component fluxes and varying powerlaw indices point towards
a varying corona/sub-keplerian flow. Based on the spectral fits the boundary
layer radius and magnetospheric radius were constrained to be $\sim$ 14-18 km
and $\sim$ 9-19 km respectively. Cross- Correlation Function studies were
performed between the 0.8-3 keV soft SXT lightcurve and 10-20 keV hard LAXPC
lightcurve and correlated and anticorrelated lags were found, which was used to
constrain the coronal height to 0.6-20 km (\b{eta}=0.1). Since the inner disk
radius is not varying during the observations, we conclude that the detected
lags are possibly caused by a varying structure of corona/boundary layer in the
inner region of the accretion disk. Based on the observations, a geometrical
model is proposed for explaining the detected lags in the atoll source 4U
1705-44.
