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This paper explores application of independently driven double-gate MOSFETs (DGFET) for low-power, low-voltage analog integrated circuit design. In back-gate configuration, the second gate of DGFET can be used to tune the threshold voltage of the device. A simple and cascade current mirror based on bulk-driven transistor is redesigned with DGFETs and shown to have smaller input voltage drop and low power consumption. Capability of dynamic threshold tuning is exploited to design an adaptive two-stage operational amplifier (op amp) which can operate at voltages as low as 0.5V without sacrificing performance parameters.