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Annular oscillation circuit

A technology of a ring oscillator circuit and an oscillator circuit, which is applied in the electronic field, can solve the problem of low duty-duty adjustability of the output clock signal, and achieve the effect of reducing power consumption

Inactive Publication Date: 2017-10-20
SEMICON MFG INT (SHANGHAI) CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the ring oscillator using a single-sided current source as a load has the problem of low duty cycle adjustability of the output clock signal

Method used

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Examples

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Embodiment Construction

[0018] In the ring oscillator formed by the inverter, the controllability of the power consumption of the inverter is poor, so the controllability of the power consumption of the ring oscillator formed by the inverter is also poor. In the prior art, a ring oscillator using a unilateral current source as a load has appeared, which has a good power consumption control effect compared with the existing ring oscillator composed of an inverter. However, ring oscillators that use a single-sided current source as a load suffer from poor duty cycle.

[0019] refer to figure 1 , a structural diagram of an existing ring oscillator circuit is given. figure 1 Among them, the ring oscillation circuit includes a current mirror circuit unit, an oscillation circuit unit and an inverter.

[0020] The current mirror circuit unit includes a PMOS transistor MP 5 And the preset current source, among them: PMOS tube MP 5 The source is coupled to the preset voltage source VDD, the gate is couple...

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PUM

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Abstract

An annular oscillation circuit comprises a current mirror image circuit unit, an oscillation circuit unit, a switch shaping circuit unit and an inverter, wherein the current mirror image circuit unit is coupled to the oscillation circuit unit and provides image current to the oscillation circuit unit and the switch shaping circuit unit, and the oscillation circuit unit, of which the input end is coupled with the current mirror image circuit unit, comprises N annular oscillation subunits connected end to end, wherein N is an odd number and no smaller than three. The load capacitor of at least one oscillation subunit is an adjustable capacitance module. The switch shaping circuit unit is coupled to the output terminal of the oscillation circuit unit and switches on / off according to the output voltage of the oscillation circuit unit to shape the output voltage waveform of the oscillation circuit unit. The inverter is coupled to the output terminal of the switch shaping circuit unit. The annular oscillation circuit can output clock signals with high duty ratio.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a ring oscillation circuit. Background technique [0002] For most system-on-a-chip (System On a Chip, SOC), an oscillator can provide a clock signal for the chip and is an essential component. Among various types of oscillators, ring oscillators can work without an external crystal or LC tuning circuit. The ring oscillator (RingOscillator, ROSC) is simple in structure, easy to start, low in cost, and usually does not require additional pins. It is suitable for some applications that do not require high frequency accuracy but require high power consumption and circuit area, such as single-chip microcomputers. watchdog clock. [0003] The existing ring oscillator is usually composed of three or more odd-numbered inverters, and the output terminal of the previous inverter among two adjacent inverters is connected to the input terminal of the latter inverter. And the output e...

Claims

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Application Information

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IPC IPC(8): H03K3/03H03K3/012
CPCH03K3/012H03K3/0315
Inventor 荀本鹏徐丽郭萌萌唐华朱晓明
Owner SEMICON MFG INT (SHANGHAI) CORP
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