Merged integrated oscillator circuit

An oscillator for producing oscillatory output signals, comprising:

• a current mirror circuit having an input and an output which is enabled and disabled accordingly in response to a control signal applied thereto for sinking first and second currents at said input and output respectively when enabled, said second current being greater than said first current;
• constant current source means for providing first and second substantially equal currents at first and second outputs, said first and second outputs being coupled to said input and output respectively of said current mirror circuit;
• charge storage means coupled to said output of said current mirror circuit, said charge storage means being charged and discharged between first and second voltage levels at substantially equal rates as said current mirror circuit is alternately disabled and enabled;
• threshold voltage producing means for establishing a lower and an upper threshold voltage at first and second outputs;
• merged comparing means having first, second and third inputs and first and second outputs, said first and second inputs being coupled respectively to said first and second outputs of said threshold voltage producing means, said third input being coupled to said output of said current mirror circuit, said comparing means being switched between first and second output level states in response to said charge storage means being charged and discharged between said first and second voltage levels;
• and
• latch load means coupled to said first and second outputs of said comparing means and being responsive to said comparing means for providing said control signal.