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Ring oscillator

A technology of ring oscillator and ring oscillator circuit, which is applied in the direction of electric pulse generator circuit, logic circuit to generate pulse, pulse technology, etc., can solve the problems of frequency stability, insufficient accuracy, and limit the scope of use of ring oscillators, etc. Achieve the effects of simple structure, high frequency stability, and improved frequency accuracy

Active Publication Date: 2016-10-12
WUHAN UNIV
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AI Technical Summary

Problems solved by technology

The traditional ring oscillator has the advantage of simple circuit structure, but it also has the limitations of frequency stability, low precision and only a single frequency output, which greatly limits the scope of use of the ring oscillator

Method used

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Embodiment Construction

[0026] See figure 1 , the ring oscillator includes a reference source circuit, an adjustable current source circuit and a ring oscillator circuit, and the reference source circuit is not necessary. The reference source circuit, the adjustable current source circuit and the ring oscillator circuit are all connected to the external power supply (VDD), the external control signal EN and the ground (GND). I B The DC current generated by the reference source circuit of classical structure flows into the adjustable current source circuit. External control levels TRM1, TRM2, TRM3, TRM4 input adjustable current source circuit, control the adjustable current source circuit to generate three constant current sources I1, I2, I3, the size of I1, I2, I3 is related to the width-to-length ratio of the MOSFET, in, Indicate the width-to-length ratios of M7, M8, and M9, respectively. I1, I2, and I3 are input to the ring oscillation circuit to cause oscillation, and the output terminal of ...

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Abstract

The invention discloses a ring oscillator. The ring oscillator comprises a reference source circuit, an adjustable current source circuit and a ring oscillation circuit; the reference source circuit is used for generating a direct current IB, and the direct current IB is inputted to an M4 drain electrode of the adjustable current source circuit; the adjustable current source circuit is used for generating three constant current sources I1, I2, and I3 under the action of an external control level, and inputting the three constant current sources to the ring oscillation circuit; and the ring oscillation circuit is used for outputting an OSC clock signal under the action of the constant currents I1, I2 and I3. The ring oscillator provided by the invention is high in frequency stability, high in accuracy and adjustable in frequency; the structure is simple and flexible, which can be realized by adopting a CMOS technology and is suitable for industrialization; and besides, the application is wide and an accurate clock signal can be provided for a low frequency digital integrated circuit.

Description

technical field [0001] The invention belongs to the technical field of power management, and in particular relates to a ring oscillator. Background technique [0002] In order for digital integrated circuits to work properly, it is necessary to provide them with an accurate and stable clock signal. Voltage Controlled Oscillator (Voltage Controlled Oscillator, VCO) has high oscillation frequency and high frequency stability, but its circuit structure is relatively complicated, and it is mainly used in high-frequency digital integrated circuits. In low-frequency digital integrated circuits, due to design cost considerations, ring oscillators in the form of capacitor charging and discharging are mainly used to provide clock signals. The traditional ring oscillator has the advantage of simple circuit structure, but it also has the limitations of frequency stability, low precision and only a single output frequency, which greatly limits the scope of use of the ring oscillator. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K3/03
CPCH03K3/0315
Inventor 江金光唐亚男
Owner WUHAN UNIV
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