| 摘要 |
PROBLEM TO BE SOLVED: To provide a temperature voltage sensor that enables highly accurate measurement of temperature and also enables measurement of successively changing power source voltage.SOLUTION: A temperature voltage sensor comprises: ring oscillators 2a, 2b different in temperature characteristic of oscillatory frequency; a reference frequency supply part 1 that supplies a reference clock signal f0; a frequency counter 32 that generates frequency count data corresponding to oscillatory frequency; a coefficient storage part 34 storing the coefficients of two-dimensional high-order polynominal approximations (f1(T, V), f2(T, V)) of two (T, V)s calculated from data obtained by measuring the respective oscillatory frequencies (f1, f2) of ring oscillators 2a, 2b for frequency count data (F1, F2) by changing temperature T and power source voltage V; and a temperature voltage conversion part 33 that obtains through operation at least one of temperature T and power source voltage V from the secondary coalition equation form of the two ring oscillators 2a, 2b having temperature T and power source voltage V as unknown numbers. Newton Raphson method is used for the solution of the secondary coalition equation form.SELECTED DRAWING: Figure 1 |
