1. An oscillator circuit comprising: a relaxation oscillator having a current input adapted to receive a charge current, a voltage input adapted to receive a threshold voltage, and a frequency output; a current generating circuit having an output coupled to the current input of the relaxation oscillator; and a voltage generating circuit having an output coupled to the voltage input of the relaxation oscillator, wherein, the current generating circuit and the voltage generating circuit are configured to generate a charge current and a threshold voltage such that their temperature dependent parameters substantially cancel to yield a substantially temperature in dependent output frequency.