In this paper, a linearly tuneable transconductor circuit is presented. The transconductance circuit works in sub-threshold region. The transconductance circuit is designed such that it produces linear tuning upto the range of 1us to 8us. The simulation for transconductance circuit is carried out in Cadence Virtuoso tool and the channel length parameter for the design is 45 nm. Since the design operates in subthreshold region, it provides additional advantage of low power.