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Achieving wide frequency tuning range without sacrificing phase noise and power consumption with CMOS voltage controlled ring oscillators (VCRO) at scaled supply voltages is a big challenge. In this paper, we explore a double gate hetero-junction TFET (HTFET) based VCRO for the first time exploiting the steep subthreshold characteristics of TFETs at scaled supply voltages down to 150mV. It has been...