Patent ID: 6225868
Filing Date: 2001-05-01
Classification: H03L

Abstract:
A voltage controlled oscillation circuit comprising:a first voltage controlled current generating circuit;a second voltage controlled current generating circuit;a current adder adapted to add at least an output current of said first voltage controlled current generating circuit and an output current of said second voltage controlled current generating circuit to produce a final output current; anda current controlled oscillation circuit outputting an oscillation signal corresponding to said final output current,wherein said first voltage controlled current generating circuit outputs a first current corresponding to an input voltage when said input voltage ranges from a first voltage to a second voltage, andsaid second voltage controlled current generating circuit outputs a second current corresponding to an input voltage when said input voltage ranges from a third voltage to said second voltage and outputs a zero current when said input voltage ranges from said first voltage to said third voltage, said third voltage having a value between the values of said first voltage and said second voltage.