A Low Power High Precision Oscillator

Abstract

The invention relates to a low power consumption and high precision oscillator. The oscillator comprises a biasing circuit, a charging and discharging circuit electrically connected with the biasing circuit, and a logic circuit electrically connected with the charging and discharging circuit. A reference voltage is generated by the biasing circuit; the charging speed of the charging and discharging circuit is controlled; the voltage on the charging and discharging circuit is compared with that on the logic circuit so as to generate clock signal output. According to the oscillator of the invention, the clock frequency is only related to a resistance and a capacitance and is independent of a temperature; the circuit power consumption can be greatly and effectively reduced; the temperature characteristic is relatively good; and the precise clock signal output is obtained through controlling the values of the resistance and the capacitance precisely.

Description

technical field [0001] The invention relates to a clock generation circuit, in particular to a low-power-consumption high-precision oscillator integrated in a chip. Background technique [0002] In the field of integrated circuits, clock circuits are required to provide clock signals to digital circuits. The clock circuit based on the comparator structure is greatly affected by the response time of the comparator, and the response time is related to temperature, which causes the clock frequency to vary greatly with temperature. [0003] In the prior art, an oscillator mentioned in WO 2006 / 023145 A2 patent is a traditional RC clock generation circuit, please refer to figure 1 , the oscillator consists of a PMOS transistor P1, an NMOS transistor N1, a capacitor C1 and a comparator COM1 to form a half-period charge and discharge circuit. Such as figure 2 As shown, the half cycle time of the clock is composed of the sum of t1, t2 and t3, t1 is the time when Vc1 is charged to...

AI Technical Summary

Problems solved by technology

However, it can be clearly seen from the figure that the oscillator is greatly affected by the delay time of the comparator COM1, because t2 accounts for nearly 20% of the entire clock cycle, and the oscillator needs the comparator to respond quickly, so the power consumption of the circuit also larger

[0004] In summary, in low power applications, it is not possible to use figure 1 The oscillator shown is used as a clock generator

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