Patent ID: 6414522
Filing Date: 2002-07-02
Classification: G05F,G11C,H02M,H03K

Abstract:
A circuit for use in a charge pump of an integrated circuit device comprising:a bias generator having an input for receiving a pump enable signal and for generating a ramped bias signal in response to said pump enable signal; and a voltage controlled oscillator having an input for receiving said ramped bias signal and for generating an oscillating signal having a frequency dependent upon the voltage of said ramped bias signal; wherein said bias generator further comprises: an inverter having an input for receiving said pump enable signal and having an output for generating a first signal in response thereto; a MOS capacitor having a first end connected to said out put of said inverter, and a second end connected to ground; and an NMOS transistor having a first terminal, a second terminal and a gate for controlling the flow of circuit between said first and said second terminal, said gate of said NMOS transistor for receiving said first signal, said first terminal connected to ground, and said second terminal connected to said input of said voltage controlled oscillator.