Oscillator frequency calibration circuit and frequency calibration method thereof
A technology of oscillation frequency and calibration method, which is applied in the direction of automatic control of electrical components and power, etc., can solve the problem of long time and achieve the effect of improving the accuracy of frequency calibration
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[0040] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.
[0041] An oscillation frequency calibration circuit of an oscillator, such as figure 1 As shown, it includes: a state machine module 101, which is used to output a counting start signal after receiving a calibration start signal, and control state relationship transfer; a reference clock counter 102 is used to start counting after receiving a counting start signal, and to the state machine module 101 Feedback oscillator delay completes the bit (stDelBit) signal; Frequency division clock counter 103 is used to start counting after receiving the count start signal; Capacitance word selection module 104 is used to store the count value of reference clock counter 102 and frequency division clock counter 103 and A preset algorithm is used to determine the optimal capacitor control word.
[0042] The invention also di...
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