Circuit and method for sensing a physical quantity, oscillator circuit of a smart card and temperature sensor circuit

摘要

A circuit (100) for sensing a physical quantity according to one embodiment of the present invention contains a first oscillator circuit (-), which is configured for this purpose, a first clock signal (cs), which includes a first frequency by the physical quantity is dependent on, and a second oscillator circuit (-), which is configured for this purpose, a second clock signal (cs), which comprises a second frequency, which is a function of the physical quantity. The switching circuit (100) in addition, a frequency comparator circuit (120), which is configured for this purpose, a frequency signal, which indicates the physical quantity, wherein the frequency signal on the first and the second frequency is based, wherein the first and second oscillator circuit (110) are configured for this purpose, the first (cs) and the second (cs2) clock signal is to provide in such a way that, due to a change in the physical quantity of a frequency of the first and second frequency increases, while the other of the first and second frequency increases.