CN203643880U - Reference voltage anti-interference circuit for high-speed and ultrahigh-speed integrated comparators - Google Patents
Reference voltage anti-interference circuit for high-speed and ultrahigh-speed integrated comparators Download PDFInfo
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- CN203643880U CN203643880U CN201320686728.5U CN201320686728U CN203643880U CN 203643880 U CN203643880 U CN 203643880U CN 201320686728 U CN201320686728 U CN 201320686728U CN 203643880 U CN203643880 U CN 203643880U
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- reference voltage
- comparators
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- operational amplifier
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Abstract
The utility model aims to provide a reference voltage anti-interference circuit for high-speed and ultrahigh-speed integrated comparators. When the high-speed and ultrahigh-speed integrated comparators are used, equivalent impedance between in-phase ends and inverted ends is lower if the frequency of compared signals is higher due to equivalent capacitance between the in-phase ends and inverted ends of the comparators, the reference voltage of the inverted ends of the comparators is fluctuated along with the fluctuation of the compared signals of the in-phase ends of the comparators if the internal resistance of thevenin equivalent circuits of reference voltage units is not low enough, and when the frequency reaches a certain value, the reference voltage is almost equal to the compared signals, and cannot be fixed at designed reference voltage. According to the reference voltage anti-interference circuit for the high-speed and ultrahigh-speed integrated comparators, the voltage of the inverted ends of the comparators is stabilized at the designed reference voltage as long as the frequency of the compared signals is within a range where the comparators can work. The circuit comprises a reference voltage generation unit, a voltage type operational amplifier and a comparator.
Description
Technical field
The present invention relates to electronic surveying field, concretely, relate to reference voltage anti-clutter circuit and the using method of a kind of high speed and hypervelocity integrated comparator.
Background technology
High speed and ultrahigh-speed comparator are in use, due to the equivalent capacity between comparer in-phase end and end of oppisite phase, larger when being compared the frequency of signal, equiva lent impedance between in-phase end and end of oppisite phase will be less, if the internal resistance of the thevenin equivalent circuit of reference voltage unit is not little, the reference voltage that causes comparer end of oppisite phase can be fluctuateed with the fluctuation that is compared signal of comparer in-phase end, in the time that frequency reaches certain value, both are almost equal, and can be inconstant on designed reference voltage.Therefore need to design a kind of circuit, can make comparer end of oppisite phase reference voltage constant on designed reference voltage level.
Summary of the invention
The technical problem to be solved in the present invention is to provide reference voltage anti-clutter circuit and the using method of a kind of high speed and ultrahigh-speed comparator, as long as be compared in the scope that the frequency of signal can work at comparer, no matter its frequency is much, and the end of oppisite phase voltage stabilization of comparer is on designed reference voltage level.
The present invention adopts following technical scheme to realize goal of the invention:
A reference voltage anti-clutter circuit for high speed and hypervelocity integrated comparator, mainly comprises reference voltage generation unit, voltage-type operational amplifier, comparer.It is characterized in that: described voltage generation unit output is connected with the anode of described voltage-type operational amplifier; The output terminal of described voltage-type operational amplifier is connected with the negative terminal of described voltage-type operational amplifier; The output terminal of described voltage-type operational amplifier is connected with the negative terminal of described comparer.
As the further restriction of the technical program, the reference voltage anti-clutter circuit of described high speed and hypervelocity integrated comparator, its feature: described reference voltage generation unit can have two kinds of fixed and adjustable types, fixed reference voltage unit is by resistance r1, r2 dividing potential drop composition, it is exactly reference voltage level that r1 is multiplied by VCC with the ratio of r2; Adjustable type reference voltage unit comprise K switch 1, K2 ... Kn, resistance R 1, R2 ... Rn, the DA chip U1 of n position, the output valve of this chip DA is exactly reference voltage level, and wherein R1～Rn draws effect on only plaing, and resistance can be fixed as 10K.
A method of operating for the reference voltage anti-clutter circuit reference voltage unit of high speed and hypervelocity integrated comparator, is characterized in that: determine that according to needed reference voltage level circuit connects.For fixed reference voltage unit, only need to determine r1, the resistance of r2, for example VCC is 5V, required reference voltage level is 2V, now selects r1=4K, r2=10K; For adjustable type reference voltage unit, only need to determine the closure of switch, if for example DA is 8, required reference voltage level is 2V, DA full scale value is 5V, the required input value of the D7～D0 of DA chip is 01100110, i.e. K8, K5, K4, K1 closure, K7, K6, K3, K2 disconnects.By regulating the break-make of each switch, can change easily reference voltage level.
Brief description of the drawings
Fig. 1 is the one-piece construction block scheme of the preferred embodiment of the present invention
Fig. 2 is the fixed reference voltage generation unit circuit theory diagrams of the preferred embodiment of the present invention
Fig. 3 is the adjustable type reference voltage generation unit circuit theory diagrams of the preferred embodiment of the present invention
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, the present invention is done with further describing in detail.
Referring to Fig. 1, the one-piece construction block diagram of the preferred embodiment of the present invention comprises reference voltage unit, voltage-type comparer and comparer.Described voltage generation unit output is connected with the anode of described voltage-type operational amplifier; The output terminal of described voltage-type operational amplifier is connected with the negative terminal of described voltage-type operational amplifier; The output terminal of described voltage-type operational amplifier is connected with the negative terminal of described comparer.
Referring to Fig. 2, the present invention fixedly selects the fixed reference voltage generation unit circuit of embodiment, comprises resistance r1, r2.Method of operating is as follows: by resistance r1, r2 dividing potential drop obtains needed reference voltage level, and for example VCC is 5V, and required reference voltage level is 2V, now selects r1=4K, r2=10K.
Referring to Fig. 3, the present invention fixedly selects the adjustable type reference voltage generation unit circuit of embodiment, comprise K switch 1, K2 ... Kn, resistance R 1, R2 ... Rn, the DA chip U1 of n position.Method of operating is as follows: by gauge tap K1, K2 ... the disconnection of Kn, with closed, determined the input of DA chip D0～Dn-1, thereby is made DA export needed reference voltage level, if for example DA is 8, required reference voltage level is 2V, and DA full scale value is 5V, the required input value of the D7～D0 of DA chip is 01100110, i.e. K8, K5, K4, K1 closure, K7, K6, K3, K2 disconnects.For adjustable type reference voltage generation unit, can regulate easily the break-make of each switch, thereby change reference voltage level.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited only to above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present invention, also belong to protection scope of the present invention.
Claims (2)
1. the reference voltage anti-clutter circuit of a high speed and hypervelocity integrated comparator, mainly comprise reference voltage generation unit, voltage-type operational amplifier, comparer, is characterized in that: shown in voltage generation unit output be connected with the anode of described voltage-type operational amplifier; The output terminal of described voltage-type operational amplifier is connected with the negative terminal of described voltage-type operational amplifier; The output terminal of described voltage-type operational amplifier is connected with the negative terminal of described comparer.
2. according to claim 1 at a high speed and the reference voltage anti-clutter circuit of hypervelocity integrated comparator, its feature: described reference voltage generation unit can have two kinds of fixed and adjustable types, fixed reference voltage unit is by resistance r1, r2 dividing potential drop composition; Adjustable type reference voltage unit comprise K switch 1, K2 ... Kn, resistance R 1, R2 ... Rn, the DA chip U1 of n position, the output valve of this chip DA is exactly reference voltage level, and wherein R1～Rn draws effect on only plaing, and resistance can be fixed as 10K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320686728.5U CN203643880U (en) | 2013-11-01 | 2013-11-01 | Reference voltage anti-interference circuit for high-speed and ultrahigh-speed integrated comparators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320686728.5U CN203643880U (en) | 2013-11-01 | 2013-11-01 | Reference voltage anti-interference circuit for high-speed and ultrahigh-speed integrated comparators |
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| Publication Number | Publication Date |
|---|---|
| CN203643880U true CN203643880U (en) | 2014-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320686728.5U Expired - Fee Related CN203643880U (en) | 2013-11-01 | 2013-11-01 | Reference voltage anti-interference circuit for high-speed and ultrahigh-speed integrated comparators |
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| CN (1) | CN203643880U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113341214A (en) * | 2021-07-22 | 2021-09-03 | 深圳市江芯电子科技有限公司 | Microprocessor power supply voltage monitoring system |
-
2013
- 2013-11-01 CN CN201320686728.5U patent/CN203643880U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113341214A (en) * | 2021-07-22 | 2021-09-03 | 深圳市江芯电子科技有限公司 | Microprocessor power supply voltage monitoring system |
| CN113341214B (en) * | 2021-07-22 | 2023-09-08 | 深圳市江芯电子科技有限公司 | Microprocessor power supply voltage monitoring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140611 Termination date: 20161101 |
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| CF01 | Termination of patent right due to non-payment of annual fee |