Oscillator circuit

Abstract

The invention discloses an oscillator circuit. The oscillator circuit comprises an oscillation generation circuit, a transmission delay compensation circuit and a reference voltage generation circuit;the oscillation generation circuit comprises a capacitor, a capacitor charge and discharge circuit, a current mirror circuit and a band-gap reference source; and the reference voltage generation circuit generates a high reference voltage and a low reference voltage and controls the oscillation frequency of the oscillation generation circuit through a difference of the two reference voltages. According to the oscillator circuit, the influences of offset voltages of comparators on the frequency are eliminated by means of the mode of controlling the oscillation frequency generated by the chargeand discharge capacitor through the difference of the two reference voltages; and transmission delay is eliminated by the transmission delay compensation circuit, therefore, the stability of the generated frequency can be kept, the area of a needed chip is small, and the power consumption is low.

Description

[technical field] [0001] The present invention relates to an oscillator, in particular to an oscillator circuit. [Background technique] [0002] Document "A 120nW 18.5kHz RC oscillator with comparator offsetcancellation for ±0.25% temperature stability", (http: / / ieeexplore.ieee.org / document / 6487692 / ), through a reference voltage generation circuit and two independent charge and discharge capacitors A reference voltage with a fixed value is proposed to control the charging and discharging time of the charging and discharging capacitor on the comparator to generate an oscillator. It can make the reference voltage alternate at the positive and negative input terminals of the comparator every half cycle, that is, in the first half cycle of an oscillation, the reference voltage is input from the positive phase terminal of the comparator, and the voltage on the capacitor is from the negative phase terminal. Input; the reference voltage of the second half cycle is input from the n...

AI Technical Summary

Problems solved by technology

However, this design does not eliminate the influence of the offset voltage on the comparator on the reference voltage, so the oscillation frequency generated by this circuit is difficult to achieve high temperature stability

In addition, because this design needs to design a mirror circuit that is well matched with the oscillation circuit to control the charging and discharging speed of the charging and discharging circuit to the capacitor within the transmission delay td, but this design uses too many capacitors and comparators, Therefore, in the actual semiconductor production process, due to some process errors, it is difficult to achieve the required matching degree, so the stability of the oscillation frequency of the circuit is further reduced.

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