| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vibration type gyroscope which allows the temperature dependence of detection sensitivity of a sensor element to be favorably compensated in a wider temperature range. <P>SOLUTION: The excitation level of an oscillator having temperature characteristics f(T) is changed according to 1/f(T) for compensation. A control circuit 108 controls the resistance value of a variable resistance circuit 106 to which a reference current not depending on temperature is fed with voltage V(temp) which is inputted from a temperature voltage generation circuit 110 and changes according to 1/f(T), such that the voltage drop agrees with V(temp). A variable resistance circuit 104 having the same configuration as of the variable resistance circuit 106 is provided with resistance temperature characteristics in response to f(T) by the signal of the control circuit 108. An inverted amplifying circuit 102 with a monitor input voltage in response to the excitation level controls the gain of a variable gain amplifying circuit 42 for amplifying an oscillation signal. The inverted amplifying circuit 102 has an inverted input terminal to which the variable resistance circuit 104 is connected, so that a correction current I(c) which changes in response to 1/f(T) is subtracted from a monitor current I(m). <P>COPYRIGHT: (C)2013,JPO&INPIT |
