High-speed differential output type voltage-controlled oscillator with low soft error rate

Abstract

The invention discloses a high-speed differential output type voltage-controlled oscillator with a low soft error rate. The high-speed differential output type voltage-controlled oscillator comprisesmore than three VCO units, two voter units and a differential output unit. The VCO units are in cascade connection. Each VCO unit is annularly connected with each voter unit to form an annular oscillator. The output ends of the two voting device units are respectively connected with the differential output unit, each VCO unit respectively outputs one path of voltage signals with the same phase toeach voting device unit, and results output by the two voting device units are differentially output to final voltage output signals through the differential output unit. The high-speed differential output type voltage-controlled oscillator has the advantages of simple and compact structure, low cost, low soft error rate, good radiation resistance, high efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of voltage-controlled oscillators, in particular to a high-speed differential output voltage-controlled oscillator with low soft error rate. Background technique [0002] In order to meet the demand for integrated circuits with higher integration, more functions and lower power consumption, the feature size and operating voltage of integrated circuits have been continuously reduced, resulting in a sharp increase in the radiation sensitivity of circuits. The voltage-controlled oscillator is an important part of the integrated circuit. In the prior art, the voltage-controlled oscillator usually does not have the anti-irradiation function. Once it is affected by the radiation, the output of the voltage-controlled oscillator will be affected by the single event effect. Mistakes can seriously affect the performance of the circuit. Therefore, there is an urgent need to provide a voltage-controlled oscillator with...

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Problems solved by technology

[0003] In order to solve the above problems, one solution is to use multiple independently operating bias circuits to control the delay unit inside the ring oscillator to form a multi-bias voltage-controlled oscillator. When a high-energy particle hits any one of the bias circuits circuit, since the other three bias circuits are in normal working condition, it will only affect the working condition of one delay unit, and the other delay units are still in normal working condition, which can reduce the overall frequency deviation, thereby suppressing the voltage control The single event effect caused by the irradiation of the oscillator circuit, but this type of method can only suppress the single event effect when high-energy particles hit the bias circuit, and the suppression effect is limited;

[0004] Another solution is to configure three VCO circuits that operate relatively independently, and voters vote on the results of the VCO circuits to form a cross-coupled voltage-controlled oscillator. Through this cross-coupled voltage-controlled oscillator, when there is a high-energy When a particle hits any VCO circuit, since the other VCO circuits are in normal working state, the voting unit can shield the wrong signal output by the VCO circuit that has a single event effect, and finally output the correct signal of the other VCO circuit, thereby suppressing the voltage. However, in this type of method, when high-energy particles hit the voting device, they will still be affected by the single event effect, and the anti-radiation effect still needs to be improved.

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