Patent ID: 6198344
Filing Date: 2001-03-06
Classification: G05F

Abstract:
A back bias voltage level sensing circuit comprising:a constant current generation unit for generating a constant current regardless of a variation in a power supply voltage;a switch for transferring or disconnecting the constant current generated from the constant current generation unit under the control of a switch control signal;a current distribution unit for distributing the constant current transferred by the switch by using a current mirror under the control of a first control signal;a switching current removal unit for flowing the switching current generated when the switch is turned on and turned off to the ground according to a second control signal;a back bias voltage level sensing unit for sensing a level of a back bias voltage and outputting an output signal according to the current distributed by the current distribution unit; anda switching controlling unit for receiving an oscillating signal and the output signal from the back bias voltage level sensing unit and outputting a switch control signal for turning on and turning off the switch in a predetermined period, a first control signal for controlling the current distribution unit, and a second control signal for controlling the switching current removal unit.