Current controlled ring oscillator and method for controlling the same
OwnerHai Mei XUEinventor
Life of this patent
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Abstract
A current controlled ring oscillator and a method for controlling the same are provided. The current controlled ring oscillator includes a charge pump (CP), a loop filter (LF), a voltage-current (V-I) converter, and an oscillation unit. The CP is used to provide a charging/discharging current. The LF is coupled to the CP, and is used to provide a control voltage. The V-I converter is coupled to the CP, and is used to convert the control voltage to a control current. The oscillation unit includes a plurality of current controlled delay cells serially connected to one another as a ring, and the oscillation unit is coupled to the V-I converter, and controlled by the control current to generate an oscillation signal.
Claims18
A current controlled ring oscillator, comprising:
- a voltage-current (V-I) converter, for converting a control voltage to a control current;
- and
- an oscillation unit, comprising a plurality of current controlled delay cells serially connected to one another as a ring, and coupled to the V-I converter, wherein an oscillation frequency of an oscillation signal generated by the oscillation unit is controlled by the control current.
A method for controlling a ring oscillator, comprising:
- providing a control voltage;
- converting the control voltage to a control current;
- providing a ring oscillator formed by a plurality of current controlled delay cells;
- and
- controlling an oscillation frequency of an oscillation signal generated by the ring oscillator by the control current.
A current controlled ring oscillator, comprising:
- a plurality of current controlled delay cells, serially connected to one another as a ring, for outputting an oscillation signal;
- and
- a control current source, coupled to the current controlled delay cells, so as to provide a control current and inject the control current to power supply ends of the current controlled delay cells, thereby controlling an oscillation frequency of the oscillation signal.
Dependencies are inferred from the claim text.