Patent ID: 7432771

Claim:
An oscillator circuit, composing: a current source comprising an amplifier, a first resistor, a second resistor. and a third inverter whose input and output are connected and coupled with an input of the amplifier, wherein the amplifier is configured to generate a first current flowing through the first resistor and the second resistor; a vibrator circuit comprising a first capacitor and a second capacitor, wheren the first capacitor is configured to charge in response to the first current and discharge when the voltage across the first capacitor reaches a first threshold voltage of a first inverter and the second capacitor is configured to charge in response to the first current and discharge when the voltace across the first capacitor reaches second threshold voltage of a second inverter; and a latch circuit comprising the first inverter and the second inverter, wherein the latch circuit is configured to produce an oscillating signal in response to the charging and the discharging of the first capacitor and the second capacitor in the vibrator circuit, wherein the threshold voltage of the third inverter is substantially the same as the first threshold voltage or the second threshold voltage, and wherein tie first inverter, the second inverter, and the third inverter are disposed adjacent to each other in the layout of the oscillator circuit.