Patent ID: 8624681

Claim:
A ring oscillator, comprising: a plurality of inverters connected in a cascade fashion, wherein an output of each inverter is connected to an input of another inverter; and an output terminal configured to output an oscillatory signal having a frequency, wherein each of the plurality of inverters comprises: a first transistor; a first resistor having a first end and a second end, wherein the first end of the first resistor is directly connected to a source of the first transistor, and wherein the second end of the first resistor is directly connected to a first voltage potential; a second transistor; a second resistor having a first end and a second end, wherein the first end of the second resistor is directly connected to a source of the second transistor, and wherein the second end of the second resistor is directly connected to a second voltage potential, such that the first resistor, the first transistor, the second transistor, and the second resistor form a series connection; and a capacitor having a first end and a second end, wherein the first end of the capacitor is directly connected to each of (i) the source of the first transistor and (ii) the first end of the first resistor, and wherein the second end of the capacitor is directly connected to each of (i) the source of the second transistor and (ii) the first end of the second resistor, such that the capacitor is connected in parallel with the first transistor and the second transistor, and is connected in series with the first resistor and the second resistor, wherein the frequency of the oscillatory signal is based at least on (i) resistance values of the first resistors and (ii) resistance values of the second resistors.