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Comparator without metastable state

A metastable and comparator technology, applied in the field of comparators, can solve the problems of reduced input voltage range, long regeneration time, and reduced comparator speed

Inactive Publication Date: 2012-02-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The input voltage range that produces a metastable output can be reduced by using a regenerative circuit, but this range cannot be reduced to 0
In addition, when the input is close to the flipping threshold voltage, even if the regeneration circuit can finally generate a digital level, the regeneration time will be very long, so the speed of the comparator is reduced

Method used

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  • Comparator without metastable state
  • Comparator without metastable state

Examples

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Embodiment Construction

[0013] The present invention is further described in detail by a specific example below.

[0014] figure 2 A complete circuit diagram using a hysteretic comparator with no metastable output is given. The hysteresis comparator is composed of MOSFETs M0~M6. Vb is an external bias voltage. Vin is the input voltage. Vout is the output voltage. Vc1 and Vc2 are external differential signals, and can be expressed as Vc1=Vref+v(t), Vc2=Vref-v(t), where Vref is the DC component of the differential signal, and v(t) is the AC time of the external differential signal into ingredients. Let the AC time-varying amplitude of the external differential signal be Vd. The resistance values ​​of resistors R1 and R2 satisfy R1:R2=5:4, so the voltage input to the input terminal b of the hysteresis comparator can be expressed as Vref+v(t) / 9. Therefore, when the output of the hysteresis comparator is high, its flipping threshold voltage can be expressed as Vref+v(t) / 9+V1, and when the output i...

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Abstract

The invention belongs to the technical field of integrated circuit designing, particularly a comparator without a metastable state. The comparator consists of a reference voltage source Vref, a dithering voltage source Vd(t) and a hysteresis comparator T1. Input voltage Vin is connected with the input end a of the hysteresis comparator T1. The reference voltage source Vref is connected with the input end b of the hysteresis comparator T1 after being connected in series with the dithering voltage source Vd(t) with the direct current level of 0. The output end c of the hysteresis comparator T1 is connected with output voltage Vout. Dithering is added to the reference voltage, thereby avoiding the metastable state of the output of the comparator.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and in particular relates to a comparator in a mixed signal circuit. Background technique [0002] In a mixed-signal circuit, an analog signal needs to be converted to a digital signal. As one of the most basic one-bit analog-to-digital converters, a comparator is the basic building block in mixed-signal circuits. [0003] In practical applications, when the input of the comparator is in a range close to the flipping threshold voltage of the comparator, the output of the comparator is no longer a digital level, but a metastable intermediate level. This level cannot be handled by digital circuits and should therefore be avoided. The input voltage range that produces a metastable output can be reduced by using a regenerative circuit, but the range cannot be reduced to zero. In addition, when the input is close to the flipping threshold voltage, even if the regeneration circuit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/34
Inventor 李一雷谈熙闫娜闵昊
Owner FUDAN UNIV
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