CN115291662B - Threshold voltage generating circuit with adjustable range - Google Patents
Threshold voltage generating circuit with adjustable range Download PDFInfo
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- CN115291662B CN115291662B CN202210923854.1A CN202210923854A CN115291662B CN 115291662 B CN115291662 B CN 115291662B CN 202210923854 A CN202210923854 A CN 202210923854A CN 115291662 B CN115291662 B CN 115291662B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The voltage selection module Vsel1 is connected with the positive electrode input end of the operational amplifier AMP1, the output of the operational amplifier AMP1 is connected with the negative electrode input end of the AMP1 to form a unit gain buffer, meanwhile, the output of the operational amplifier AMP1 is connected with the negative electrode input end of the AMP2 and the resistor R5 through the resistor R6, the voltage selection module Vsel2 is connected with the negative electrode input end of the operational amplifier AMP3, the output end of the operational amplifier AMP2 is connected with the gates of the transistor M1 and the transistor M3, the output end of the operational amplifier AMP3 is connected with the gates of the transistor M2 and the transistor M4, the drain electrode of the transistor M1 is connected with the power supply VDD, and the source electrode is connected with the resistor R2 and the resistor R3; the source of the transistor M3 is connected to the source of the transistor M4 through the voltage selection module Vsel 3.
Description
Technical Field
The invention belongs to the technical field of integrated circuits, and particularly relates to a threshold voltage generating circuit with an adjustable range.
Background
With the rapid development of the internet of things and big data industry, an analog-to-digital converter (ADC) is used as an interface in the analog and digital fields, and the application scenario is wider. For high-speed and high-precision ADCs, the reference voltage generating circuit is used to provide the reference comparison voltage of the ADC comparator, so that the precision of the reference voltage circuit and the speed of loop stabilization are certainly very important, and the precision and quantization range of the ADC are determined to some extent.
As shown in fig. 1, the existing threshold voltage generating circuit can only adjust within a certain range by changing the output resistance, and cannot accurately set the common mode voltage value and the differential mode voltage value of the generated reference voltage signal. In practice, the common mode of the input signals processed by the ADC tends to vary, and this architecture therefore limits the ability of the ADC to process the input signals. In other reference voltage generating circuits, as shown in fig. 2, although the high and low levels of the generated reference voltage can be set to a certain extent, the range is limited by the operational amplifier input swing. In addition, in a high-speed circuit, the reference voltage generating circuit is often required to provide a strong driving capability, and thus a large current needs to flow, which is very disadvantageous for such a structure that directly references the output branch as a feedback loop, and easily causes a slow loop stability, as in a flash ADC, if the reference voltage level cannot provide a stable comparison reference voltage every time the comparator is operated, the accuracy of the whole ADC will be affected.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known in the country to a person of ordinary skill in the art.
Disclosure of Invention
Compared with the prior art, the invention solves the problem that the common mode and differential mode voltage values of the output threshold voltage cannot be accurately regulated by the traditional structure, and simultaneously adds a feedback loop with mirror image output and reduced size, so that when the output stage outputs large current, the loop is quickly stabilized by using smaller current cost, the time required for loop stabilization is reduced, and the requirement of a plurality of high-performance ADCs on the reference voltage can be better met.
The object of the present invention is achieved by a threshold voltage generating circuit with an adjustable range, comprising an operational amplifier AMP1, an operational amplifier AMP2 and an operational amplifier AMP3, a resistor string based voltage selection module Vsel1, a voltage selection module Vsel2 and a voltage selection module Vsel3, and a transistor M1, a transistor M2, a transistor M3, a transistor M4,
the voltage selection module Vsel1 is connected to the positive input terminal of the operational amplifier AMP1, the output of the operational amplifier AMP1 is connected to the negative input terminal of the operational amplifier AMP1 to form a unity gain buffer, and the output of the operational amplifier AMP1 is connected to the negative input terminal of the AMP2 and the resistor R5 through the resistor R6, and the resistor R5 is connected to the positive input terminal of the operational amplifier AMP3 through the resistor R4;
the voltage selection module Vsel2 is connected with the negative electrode input end of the operational amplifier AMP3, one end of the resistor R1 is connected with the ground, the other end of the resistor R1 is connected with the positive electrode input end of the operational amplifier AMP2, the resistor R3 is connected with the positive electrode input end of the operational amplifier AMP3 sequentially through the resistor R2 and the resistor R3, the output end of the operational amplifier AMP2 is connected with the grid electrodes of the transistor M1 and the transistor M3, the output end of the operational amplifier AMP3 is connected with the grid electrodes of the transistor M2 and the transistor M4, the drain electrode of the transistor M1 is connected with the power supply VDD, and the source electrode is connected with the resistor R2 and the resistor R3; the source of the transistor M2 is connected to the resistor R4 and the resistor R5, and the source of the transistor M3 is connected to the source of the transistor M4 through the voltage selection module Vsel 3.
In the threshold voltage generating circuit with adjustable range, the transistor M1 and the transistor M2 are mirror image transistors of the transistor M3 and the transistor M4 respectively, and have a size of 1: m, and the ratio of the sum of the resistance values of the resistor R3 and the resistor R4 to the sum of the total resistance values of the resistor string of the voltage selection module Vsel3 is M:1.
in the threshold voltage generating circuit with adjustable range, the voltage selecting module Vsel2 outputs a common mode value VCM set For the operational amplifier AMP3, the threshold voltage high level Vrefp1 and the threshold voltage low level Vrefn1 are connected together through the resistor R3 and the resistor R4, and the resistance value of the resistor R3 is equal to the resistor R4.
In the threshold voltage generating circuit with adjustable range, the output differential mode voltage VDM is selected from the voltage selecting module Vsel1 module set And the operational amplifier AMP2 is inputted through the resistor R6 by the operational amplifier AMP1, the voltage of the positive input terminal of the operational amplifier AMP2 is
R6 left side voltage is
Therefore, the differential mode voltage value of the threshold voltage generating circuit is VDM real 。
Compared with the prior art, the invention has the following advantages:
1. the method realizes the separate control of the common mode and the differential mode of the output voltage of the threshold generating circuit, and ensures that the output threshold voltage can be set more flexibly, thereby better meeting the performance requirements of the ADC under different applications. Multiple flexibly changeable threshold voltages are often required in the pipelined ADC, so that the input range of the pipelined ADC is increased, and design pressure of other related module circuits such as comparators is relieved.
2. The invention skillfully designs a mirror image path of the output stage, so that a loop with small current is used for replacing the output stage to directly participate in feedback regulation, a series of problems of low stabilizing speed, difficult stabilization and the like caused by directly participating in regulation by using large current are avoided, and meanwhile, the influence of the pumping discharge flow generated by the output stage circuit in normal operation on the stability of the loop is avoided, thereby realizing higher-precision threshold voltage.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is evident that the figures described below are only some embodiments of the invention, from which other figures can be obtained without inventive effort for a person skilled in the art. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
FIG. 1 is a schematic diagram of a conventional threshold voltage generation circuit;
FIG. 2 is a schematic diagram of a conventional threshold voltage generation circuit junction;
FIG. 3 is a schematic diagram of a threshold voltage generating circuit according to the present invention;
fig. 4 is a schematic diagram of a circuit structure of a voltage selection module based on a resistor string.
The invention is further explained below with reference to the drawings and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 4. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will understand that a person may refer to the same component by different names. The description and claims do not identify differences in terms of components, but rather differences in terms of the functionality of the components. As used throughout the specification and claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description hereinafter sets forth a preferred embodiment for practicing the invention, but is not intended to limit the scope of the invention, as the description proceeds with reference to the general principles of the description. The scope of the invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the present invention, reference will now be made to the drawings, by way of example, and specific examples of which are illustrated in the accompanying drawings.
For better understanding, in one embodiment, as shown in fig. 3 to 4, the threshold voltage generating circuit with adjustable range includes an operational amplifier AMP1, an operational amplifier AMP2 and an operational amplifier AMP3, a resistor string-based voltage selecting module Vsel1, a voltage selecting module Vsel2 and a voltage selecting module Vsel3, and a transistor M1, a transistor M2, a transistor M3, a transistor M4, wherein,
the voltage selection module Vsel1 is connected to the positive input terminal of the operational amplifier AMP1, the output of the operational amplifier AMP1 is connected to the negative input terminal of the operational amplifier AMP1 to form a unity gain buffer, while the output of the operational amplifier AMP1 is connected to the negative input terminal of AMP2 and to the resistor R5 through the resistor R6, the resistor R5 is connected to the positive input terminal of the operational amplifier AMP3 through the resistor R4,
the voltage selection module Vsel2 is connected with the negative electrode input end of the operational amplifier AMP3, one end of the resistor R1 is connected with the ground, the other end of the resistor R1 is connected with the positive electrode input end of the operational amplifier AMP2, the resistor R3 is connected with the positive electrode input end of the operational amplifier AMP3 sequentially through the resistor R2 and the resistor R3, the output end of the operational amplifier AMP2 is connected with the grid electrodes of the transistor M1 and the transistor M3, the output end of the operational amplifier AMP3 is connected with the grid electrodes of the transistor M2 and the transistor M4, the drain electrode of the transistor M1 is connected with the power supply VDD, and the source electrode is connected with the resistor R2 and the resistor R3; the source of the transistor M2 is connected to the resistor R4 and the resistor R5, and the source of the transistor M3 is connected to the source of the transistor M4 through the voltage selection module Vsel 3.
In the preferred embodiment of the adjustable range threshold voltage generating circuit, the transistors M1 and M2 are mirror image transistors of the transistors M3 and M4, respectively, and have a size of 1: m, and the ratio of the sum of the resistance values of the resistor R3 and the resistor R4 to the sum of the total resistance values of the resistor string of the voltage selection module Vsel3 is M:1.
in the preferred embodiment of the adjustable threshold voltage generating circuit, the voltage selecting module Vsel2 inputs the common mode value VCM to the operational amplifier AMP3, the threshold voltage high level Vrefp1 and the threshold voltage low level Vrefn1 are connected together through the resistor R3 and the resistor R4, and the resistance of the resistor R3 is equal to the resistor R4.
In the preferred embodiment of the threshold voltage generating circuit, the output differential mode voltage is selected from the voltage selecting module Vsel1 module and is input into the operational amplifier AMP2 through the resistor R6 by the operational amplifier AMP1, and the voltage of the positive input end of the operational amplifier AMP2 is
R6 left side voltage is
The differential mode voltage value is VDM.
In one embodiment, as shown in fig. 3, the present invention provides a threshold voltage generating circuit with adjustable range, which includes three operational amplifiers and three voltage selecting modules based on resistor strings.
In one embodiment, the mirror circuit is a circuit formed by connecting a transistor M1, a resistor R3, a resistor R4, and a transistor M2, and the mirror circuit is a mirror branch of an output branch formed by the transistor M3, the voltage selection module Vsel3, and the transistor M4.
First, as shown in fig. 4, the voltage selecting block Vsel1 selects the differential mode voltage VDM to be outputted, and then the voltage is driven by the unit gain buffer AMP1 and connected to the negative input terminal of AMP2 through the resistor R6.
Since M1, M2 are mirror tubes of M3, M4 and have dimensions 1: m, and the ratio of the sum of the resistance values of the resistors R3 and R4 to the sum of the total resistance values of the resistor string of Vsel3 is M:1, we therefore construct a mirror circuit of the output branch and the current of this branch is 1/M of the current flowing through the output branch. Vrefp1 and Vrefn1 are mirror images of the high threshold reference voltage Vrefp and the low threshold reference voltage Vrefn of the output branch. This is very critical for high speed circuits, where the output branch often requires a strong driving capability, which results in a generally large current flow through it, which if the entire feedback loop is built directly using the output branch, can easily cause loop instability when the output branch draws current due to the load and wait too long for re-stabilization. The invention uses a loop with smaller current to construct a feedback loop and further control the common mode voltage and the differential mode voltage of the output branch, thereby solving the problem of stability.
Specifically, the common mode value VCM of the required threshold voltage is selected by Vsel2 set Input to op AMP3. This isWhen the voltage is lower and higher than the threshold voltage, vrefp1 and Vrefn1 are connected together through the resistors R3 and R4, and the resistance of R3 is equal to R4, so that the output threshold voltage VCM can be obtained according to the operation amplifier virtual short and virtual ground real Common-mode voltage VCM equal to the set common-mode voltage set As shown in the following formula
VCM set ＝VCM real
It can be seen that this structure allows for precise control of the common mode value of the reference threshold voltage in the output branch.
For the differential mode voltage, a desired differential mode voltage is selected from the Vsel1 block and is input into AMP2 through AMP1 via resistor R6, where the voltage at the positive input terminal of AMP2 is
Therefore, according to the virtual short virtual ground of the operational amplifier, the voltage of the negative terminal of AMP2 is 1/2 (VCM+1/2 VDM), and the voltage of the left side of R6 can be deduced to be the voltage of the right side of R6 because the resistors R5 and R6 are equal
VDM set ＝VDM real
It can be deduced that the voltage difference modulus (Vrefp-Vrefn) of the high reference voltage Vrefp and the low reference voltage Vrefn outputted by the output stage of the reference voltage generating circuit is the set VDM set 。
Thus, the common mode and differential mode values of the output reference voltage are controllable.
In summary, the present invention provides a threshold voltage generating circuit with an adjustable range, which constructs a feedback loop by using a loop with a smaller current and further controls the common mode and differential mode voltages of an output branch, so as to generate a more stable output reference voltage when the current of the output branch is larger, and meanwhile, the differential mode and the common mode of the reference voltage can be controlled.
The threshold voltage generating circuit with adjustable range selects the difference module value VDM of the required threshold voltage through Vsel1, and the voltage value is input into the operational amplifier AMP2 through the AMP1 of the unit gain buffer. The operational amplifier AMP2, AMP3 and the output stage mirror image tubes M1 and M2 form a mirror image clamping circuit of the output branch, and the mirror image clamping circuit can adjust the grid bias voltage of the output branch M3 and M4 through the operational amplifier by mirror image copying of the output branch, so that the common mode and differential mode values of the output branch are adjusted to be input values.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described specific embodiments and application fields, and the above-described specific embodiments are merely illustrative, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous forms of the invention without departing from the scope of the invention as claimed.
Claims (4)
1. The threshold voltage generating circuit with adjustable range is characterized by comprising an operational amplifier AMP1, an operational amplifier AMP2 and an operational amplifier AMP3, a voltage selecting module Vsel1, a voltage selecting module Vsel2 and a voltage selecting module Vsel3 based on resistor strings, a transistor M1, a transistor M2, a transistor M3 and a transistor M4, wherein,
the voltage selection module Vsel1 is connected to the positive input terminal of the operational amplifier AMP1, the output of the operational amplifier AMP1 is connected to the negative input terminal of the operational amplifier AMP1 to form a unity gain buffer, and the output of the operational amplifier AMP1 is connected to the negative input terminal of the AMP2 and the resistor R5 through the resistor R6, and the resistor R5 is connected to the positive input terminal of the operational amplifier AMP3 through the resistor R4;
the voltage selection module Vsel2 is connected with the negative electrode input end of the operational amplifier AMP3, one end of the resistor R1 is connected with the ground, the other end of the resistor R1 is connected with the positive electrode input end of the operational amplifier AMP2, the resistor R3 is connected with the positive electrode input end of the operational amplifier AMP3 sequentially through the resistor R2 and the resistor R3, the output end of the operational amplifier AMP2 is connected with the grid electrodes of the transistor M1 and the transistor M3, the output end of the operational amplifier AMP3 is connected with the grid electrodes of the transistor M2 and the transistor M4, the drain electrode of the transistor M1 is connected with the power supply VDD, and the source electrode is connected with the resistor R2 and the resistor R3; the source of the transistor M2 is connected to the resistor R4 and the resistor R5, and the source of the transistor M3 is connected to the source of the transistor M4 through the voltage selection module Vsel 3.
2. The adjustable range threshold voltage generation circuit of claim 1, wherein preferably, transistor M1 and transistor M2 are mirror image transistors of transistor M3 and transistor M4, respectively, and have a size of 1: m, and the ratio of the sum of the resistance values of the resistor R3 and the resistor R4 to the sum of the total resistance values of the resistor string of the voltage selection module Vsel3 is M:1.
3. the adjustable range threshold voltage generating circuit according to claim 1, wherein the voltage selecting module Vsel2 inputs the common mode value VCM to the operational amplifier AMP3, the threshold voltage high level Vrefp1 and the threshold voltage low level Vrefn1 are connected together through the resistor R3 and the resistor R4, and the resistance value of the resistor R3 is equal to the resistor R4.
4. The adjustable range threshold voltage generation circuit of claim 1 wherein the output differential mode voltage VDM is selected from a voltage selection module Vsel1 module set And the operational amplifier is input into the operational amplifier AMP2 through the resistor R6 by AMP1, the voltage of the positive input end of the operational amplifier AMP2 is
Wherein VCM set To output common mode voltage, VDM set In order to output the differential-mode voltage,
the voltage at the left side of the resistor R6 is
VDM real To actually output the differential mode voltage value.
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| CN202395750U (en) * | 2011-12-02 | 2012-08-22 | 上海贝岭股份有限公司 | Differential reference voltage buffer |
| CN104485734A (en) * | 2015-01-21 | 2015-04-01 | 中国船舶重工集团公司第七0四研究所 | Three-phase alternating-current composite type static diverter switch |
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| CN202395750U (en) * | 2011-12-02 | 2012-08-22 | 上海贝岭股份有限公司 | Differential reference voltage buffer |
| CN104485734A (en) * | 2015-01-21 | 2015-04-01 | 中国船舶重工集团公司第七0四研究所 | Three-phase alternating-current composite type static diverter switch |
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