Method and apparatus for current and voltage control of an oscillator

A variable frequency oscillator, comprising:

• a control voltage operable to generate a control current, the magnitude of said control current based on the magnitude of said control voltage;
• a current mirror operable to receive said control current and to generate a mirrored current;
• a capacitor coupled to said current mirror and operable to charge and discharge through said current mirror based on the direction of said mirrored current;
• a trigger coupled to said capacitor, said trigger operable to output a first voltage level when said capacitor charges to a first voltage threshold and to output a second voltage level when said capacitor discharges to a second voltage threshold;
• and
• a switch coupled to said current mirror and said trigger, said switch operable to change the direction of said mirrored current based on the output voltage of said trigger.

A method of generating an oscillating signal, comprising the steps of:

• generating a mirrored current based on a control current;
• charging and discharging a capacitor based on the direction of the mirrored current;
• outputting a first voltage level when the capacitor charges to a first voltage threshold and outputting a second voltage level when the capacitor discharges to a second voltage threshold;
• and
• changing the direction of the mirrored current based on the outputting of the first and second voltage levels.