fˈɪzɪks dɹˈɪvən dɪvˈaɪs mˈɑːdəlɪŋ ɪz ɪntˈɛndᵻd təbi ˈækjʊɹət, bˌʌt ɪɾ ɪz nˌɑːt fˈæst ɪnˈʌf fɔːɹ hˈaɪɚ lˈɛvəl tˈuːlz, ɪŋklˈuːdɪŋ sˈɜːkɪt sˈɪmjʊlˌeɪɾɚz sˈʌtʃ ɐz spˈaɪs.
Physics driven device modeling is intended to be accurate, but it is not fast enough for higher level tools, including circuit simulators such as SPICE.