Clock generating circuit

Abstract

The invention discloses a clock generating circuit. The clock generating circuit comprises a first current source, a resistor connected with the first current source, a second current source, a first gating circuit connected with the second current source, a second gating circuit connected with the second current source, a capacitor connected with the first gating circuit and the second gating circuit, a first comparator connected with the first current source and the capacitor, a second comparator connected with the first current source and the capacitor, and a remote sensing (RS) trigger connected with the first comparator and the second comparator, wherein the RS trigger outputs a clock signal to an input control terminal of the first gating circuit and an input control terminal of thesecond gating circuit; when the first gating circuit is gated, the second current source charges the capacitor; and when the second gating circuit is gated, the second current source discharges the capacitor. The clock generating circuit has a simple structure, low process variation and relatively low cost and improves the clock precision to the maximum degree.

Description

Technical field [0001] The invention relates to an integrated circuit, especially a clock generating circuit. Background technique [0002] The clock generation circuit is an important part of integrated circuit design. Usually an off-chip crystal or crystal oscillator is used to provide a precise clock source, but this increases the system cost, so it is necessary to design an accurate on-chip clock generation circuit. [0003] In the traditional on-chip clock generation circuit, ring oscillators with compensation for process, voltage, temperature, etc. are mostly used, or RC oscillators are used. However, the design of a ring oscillator with compensation for process, voltage, temperature, etc. is more complicated and technically difficult. The design of an RC oscillator is simple, but the accuracy of the clock frequency is limited due to the influence of the process deviation of resistance and capacitance. Summary of the invention [0004] In view of the above, it is necessary to...

AI Technical Summary

Problems solved by technology

However, the design of the ring oscillator with compensation for process, voltage, temperature, etc. is more complicated, and the technical difficulty is relatively large. The design of the RC oscillator is simple, but the accuracy of the clock frequency is limited due to the process deviation of the resistance and capacitance.

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