Patent ID: 7283007
Filing Date: 2007-10-16
Classification: G01K

Abstract:
1. An electronic circuit comprising: an oscillator for outputting a first signal during operation oscillating at a first variable frequency varying as a function of the temperature of the electronic circuit in accordance with a determined monotonic function, this electronic circuit having a second signal during operation oscillating at a second known frequency practically independent of the temperature; a measurement module for receiving the first and second oscillating signals and outputting a measurement signal for the first frequency, obtained by evaluating the first frequency using the second oscillating signal used as a reference or standard; and a conversion module for receiving the measurement signal and producing an output signal representative of the electronic circuit temperature, derived by applying a transfer function that is the inverse of the monotonic function to the measurement signal, and wherein the electronic circuit comprises at least a part of a smart card suitable for communication according to the USB standard.