Low cost and low variation oscillator

An oscillator circuit for use in integrated circuits, the oscillator circuit comprising:

• a delay generation circuit having:
• a current source;
• a first PMOS transistor coupled in series with the current source, the first PMOS transistor further coupled as a forward-biased diode;
• a second PMOS transistor coupled in series with a first NMOS transistor, the first NMOS transistor further coupled as a forward-biased diode;
• a third PMOS transistor coupled in series with a second NMOS transistor, each of the PMOS transistors coupled to one another through respective gates on each PMOS transistor;
• a capacitive element coupled in series with the first NMOS transistor;
• and
• a resistive element coupled in series with the second NMOS transistor, the first and second NMOS transistors each coupled to one another through respective gates on each NMOS transistor;
• a plurality of inverting elements coupled in series with one another;
• a transconducting element coupled to an output of the plurality of inverting elements, the transconducting element configured to discharge the capacitive element;
• and
• a latching element, the latching element coupled to latch to an output signal of the plurality of inverting elements.

An oscillator circuit comprising:

• a delay generation circuit having:
• a current source;
• a first PMOS transistor coupled in series with the current source;
• a second PMOS transistor coupled in series with a first NMOS transistor;
• a third PMOS transistor coupled in series with a second NMOS transistor, each of the PMOS transistors coupled to one another through respective gates on each PMOS transistor;
• a capacitive element coupled in series with the first NMOS transistor;
• and
• a resistive element coupled in series with the second NMOS transistor, the first and second NMOS transistors each coupled to one another through respective gates on each NMOS transistor;
• a plurality of inverting elements coupled in series with one another;
• and
• a transconducting element coupled to an output of the plurality of inverting elements, the transconducting element configured to discharge the capacitive element.