High-stability and low-power-consumption on-chip OSC circuit

Abstract

The invention discloses a high-stability and low-power-consumption on-chip OSC circuit comprising a charge and discharge circuit and a control circuit. As for the charge and discharge circuit, charge and discharge of a capacitor are performed by a current source, and charge and discharge of the capacitor are controlled by a switching tube. As for the control circuit, the level state outputted by the charge and discharge circuit is converted to generate the final output signal of an oscillator, and the output signal of the oscillator controls on / off of the switching tube in the charge and discharge circuit. The circuit is simple in structure and low in power consumption so that the oscillation output function can be realized; as for the current source, current mirroring is performed by a cascode current mirror so that the stability of the generated current I1 and I2 is high, and the oscillation frequency of the OSC circuit is enabled to be stable; and an NMOS transistor M13 is a decoupling capacitor so that the power voltage can be stabilized, the generated current is enabled to be stable, the stability of the oscillation frequency of the OSC circuit can also be enhanced and the noise is low. The comparator and the control part in the prior art are omitted, and a phase inverter, a two-input NOR gate and an RS trigger are adopted so that chip area occupation is small.

Description

technical field [0001] The invention relates to an on-chip OSC circuit with high stability and low power consumption, belonging to the technical field of oscillator circuits. Background technique [0002] Oscillators, as a frequency source, are an essential part of most electronic systems and are the heart of communication systems. There are four main types of oscillators: ring oscillators, LC oscillators, crystal oscillators, and relaxation oscillators. The circuit of the ring oscillator is relatively simple, easy to oscillate, and easy to integrate, but the frequency of the delay network is not conducive to making a flexible choice, and the power consumption is high and the phase noise is large. LC oscillators are rarely used because inductors are not easily integrated in integrated circuits. Compared with ring oscillators and LC oscillators, crystal oscillators have the highest output frequency accuracy and are not affected by temperature and power supply voltage, and h...

AI Technical Summary

Problems solved by technology

This traditional structure requires two comparators, the structure is relatively complex, the area is large, and the power consumption is large. In addition, the current source is an ordinary current source formed by an external bias, and the stability of the current is not high.

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