CN109309498B - Current steering type digital-to-analog converter based on thermometer code - Google Patents

Current steering type digital-to-analog converter based on thermometer code Download PDF

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CN109309498B
CN109309498B CN201811323841.0A CN201811323841A CN109309498B CN 109309498 B CN109309498 B CN 109309498B CN 201811323841 A CN201811323841 A CN 201811323841A CN 109309498 B CN109309498 B CN 109309498B
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comparator
current source
analog converter
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CN109309498A (en
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董蕾
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Southeast University
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise
    • H03M1/0809—Continuously compensating for, or preventing, undesired influence of physical parameters of noise of bubble errors, i.e. irregularities in thermometer codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise
    • H03M1/0845—Continuously compensating for, or preventing, undesired influence of physical parameters of noise of power supply variations, e.g. ripple

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  • Analogue/Digital Conversion (AREA)

Abstract

The invention relates to the technical field of integrated circuits, and discloses a current steering type digital-to-analog converter based on thermometer codes. The digital-to-analog converter converts the traditional current source array with the current value in binary multiple relation into the current source with the current value being a single value, so that the current mismatch is relatively small, and the conversion precision of the digital-to-analog converter is effectively improved.

Description

Current steering type digital-to-analog converter based on thermometer code
Technical Field
The invention belongs to the technical field of integrated circuits, and particularly relates to a current steering type digital-to-analog converter based on thermometer codes.
Background
A Digital to Analog Converter (DAC) is a signal Converter capable of converting a Digital signal into an Analog signal, and is widely applied to various fields requiring signal processing. The Digital-to-Analog Converter has various types, wherein a Current Steering Digital-to-Analog Converter (Current Steering Digital-to-Analog Converter) is a commonly used Digital-to-Analog Converter structure, has the advantages of high matching precision and high response speed, is widely applied to circuits with high speed and high matching requirement, has high energy utilization rate, and can output almost all energy when an output signal is differentially utilized.
However, the conventional current steering digital-to-analog converter uses a current source array whose current value is in a binary multiple relationship, and since the current source is limited by the matching accuracy of the resistance value, when the resistance values are not completely the same due to processes, photolithography and the like, further, the mismatch inevitably exists, and the accuracy of the digital-to-analog conversion is directly affected. The accuracy that can be achieved by a digital-to-analog converter depends to some extent on the mismatch error of the current source. Therefore, how to reduce the current mismatch of the current source array and further improve the conversion accuracy of the digital-to-analog converter is a technical problem which needs to be solved urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a thermometer code-based current steering type digital-to-analog converter, which converts a binary digital input signal into a thermometer code digital control signal to be output by introducing a decoding circuit, converts a traditional current source array with a current value in a binary multiple relation into a current source with a current value of a single value, and controls the current source array by using a thermometer code digital signal.
In order to achieve the technical purpose, the embodiment of the invention adopts the following technical scheme:
the utility model provides a current steering type digital-to-analog converter based on thermometer code, this digital-to-analog converter includes decoder circuit, the current source module, the comparator module, load resistance module and feedback resistance module, digital input signal is inserted to decoder circuit's one end, decoder circuit's the other end links to each other with the one end of current source module, the other end of current source module links to each other with the reverse input end of comparator module, the output of comparator module links to each other with the one end of feedback resistance module, the other end of feedback resistance module links to each other with the reverse input of comparator module and the one end of load resistance module respectively, decoder circuit converts the digital input signal of binary code into the digital control signal of thermometer code.
Furthermore, the digital input signal of the binary code is n bits, and n is a natural number which is greater than or equal to 1.
Further, the decoding circuit inputs the digital input signal D of the n-bit binary codenConversion to 2n-a digital control signal of a 1-bit thermometer code.
Further, the current source module comprises a current source array which comprises I current sources I with the same current valueiEach current source IiHas one end connected to a corresponding digital control signal, each current source IiAnother end of (1) and corresponding switch KiAre connected at one end, i is 1 to 2n-1, a natural number.
Further, a switch KiThe other ends of the two are connected in sequence and are connected with the reverse input end of the comparator module.
Furthermore, the comparator module comprises a comparator based on an operational amplifier, and a positive input end of the comparator is connected with a reference voltage Vref。
Further, the load resistance module comprises a load resistor R0Load resistance R0And the other end of the same is grounded.
Further, the feedback resistance module comprises a feedback resistor R1Feedback resistance R1Is connected to the input of the comparator, and a feedback resistor R1And the other end of the first input terminal is connected to the inverting input terminal of the comparator.
Further, the output voltage V of the digital-to-analog converteroutComprises the following steps:
Figure GDA0003574522860000021
compared with the prior art, the invention has the following technical effects:
the invention provides a current steering type digital-to-analog converter based on thermometer codes, which comprises a decoding circuit, a current source module, a comparator module, a load resistance module and a feedback resistance module, wherein one end of the decoding circuit is connected with a digital input signal, the other end of the decoding circuit is connected with one end of the current source module, the other end of the current source module is connected with the reverse input end of the comparator module, the output end of the comparator module is connected with one end of the feedback resistance module, the other end of the feedback resistance module is respectively connected with the reverse input end of the comparator module and one end of the load resistance module, and the decoding circuit converts the digital input signal of binary codes into digital control signals of the thermometer codes. The digital-to-analog converter converts a binary digital input signal into a thermometer code digital control signal to be output by introducing the decoding circuit, converts a traditional current source array with a current value in a binary multiple relation into a current source with a current value being a single value, and controls the current source array by using the thermometer code digital signal.
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Fig. 1 is a circuit diagram of a thermometer code based current steering type digital-to-analog converter according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a current steering type digital-to-analog converter based on thermometer codes according to an embodiment of the present invention.
Wherein: 1. a decoding circuit; 2. a current source module; 3. a comparator module; 4. a load resistance module; 5. and a feedback resistance module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
As shown in fig. 1, an embodiment of the present invention provides a current steering type digital-to-analog converter based on thermometer codes, where the digital-to-analog converter includes a decoding circuit 1, a current source module 2, a comparator module 3, a load resistance module 4, and a feedback resistance module 5, one end of the decoding circuit 1 is connected to a digital input signal, the other end of the decoding circuit 1 is connected to one end of the current source module 2, the other end of the current source module 2 is connected to an inverting input end of the comparator module 3, an output end of the comparator module 3 is connected to one end of the feedback resistance module 5, the other end of the feedback resistance module 5 is connected to an inverting input end of the comparator module 3 and one end of the load resistance module 4, respectively, and the decoding circuit 1 converts a digital input signal of a binary code into a digital control signal of a thermometer code.
The digital input signal of the binary code of the digital-to-analog converter is n bits, n is a natural number which is greater than or equal to 1, and the digital input signal corresponds to the input end of the decoding circuit 1.
As shown in FIG. 2, the decoding circuit 1 inputs the digital input signal D of n-bit binary codenConversion to 2n-digital control signal of 1 bit thermometer code, thus conventional electricThe current source array with the flow value in the binary multiple relation is converted into the current source with the current value in the single value, and is controlled by the thermometer code digital signal.
Illustratively, the decoding circuit 1 outputs a binary-coded digital input signal D0、D1、D2、D3、。。。Dn-1Accordingly, is converted into 2n-a digital control signal of a 1-bit thermometer code.
The current source module 2 comprises a current source array which comprises I current sources I with the same current valueiEach current source IiOne end of each current source I is respectively connected with a corresponding digital control signaliThe other end of (A) and a corresponding switch KiAre connected at one end, i is 1 to 2n-1 natural number. Each switch Ki is controlled by a thermometer code digital control signal and each current source IiRespectively receiving digital control signals with the same power supply value.
Preferably, each switch KiThe other ends of which are connected in sequence and are connected to the inverting input of the comparator module 3.
Illustratively, the switch correspondingly includes K1、K2、。。。、K2 n -2、K2 n -1
The comparator module 3 comprises an operational amplifier-based comparator, and comprises a positive input terminal, an inverse input terminal and an output terminal, wherein the positive input terminal is connected with a reference voltage VrefAnd the inverting input end is respectively connected with one end of the current source module 2, one end of the feedback resistance module 5 and one end of the load resistance module 4, and the output end outputs corresponding voltage.
The load resistance module 4 includes a load resistor R0Load resistance R0One end of the load resistor R is connected with the reverse input end of the comparator module0And the other end of the same is grounded. In particular, the load resistance R0The specific value of R is required to be specifically set according to actual conditionsAnd is used herein as a label only.
The feedback resistance module 5 comprises a feedback resistance R1Feedback resistance R1Is connected to the inverting input of the comparator module 3 and the other end is connected to the output of the comparator module 3. In particular, the feedback resistor R1The resistance value of (a) is R, and the specific value of R needs to be specifically set according to actual conditions, and is only used as a mark.
According to the current steering type digital-to-analog converter based on the thermometer codes, the decoding circuit is introduced to convert a binary digital input signal into a thermometer code digital control signal for output, the traditional current source array with the current value in a binary multiple relation is converted into a current source with the current value being a single value, and the thermometer code digital signal is used for controlling.
Preferably, as shown in FIG. 2, the output voltage V of the digital-to-analog converteroutComprises the following steps:
Figure GDA0003574522860000051
wherein, V is selected reasonablyref、I、R0、R1The analog output voltage of the digital-to-analog converter can be in a required range.
To sum up, the invention provides a current steering type digital-to-analog converter based on thermometer codes, which comprises a decoding circuit, a current source module, a comparator module, a load resistance module and a feedback resistance module, wherein one end of the decoding circuit is connected with a digital input signal, the other end of the decoding circuit is connected with one end of the current source module, the other end of the current source module is connected with the reverse input end of the comparator module, the output end of the comparator module is connected with one end of the feedback resistance module, the other end of the feedback resistance module is respectively connected with the reverse input end of the comparator module and one end of the load resistance module, and the decoding circuit converts the digital input signal of binary codes into digital control signals of the thermometer codes. The digital-to-analog converter converts a binary digital input signal into a thermometer code digital control signal to be output by introducing the decoding circuit, converts a traditional current source array with a current value in a binary multiple relation into a current source with a current value being a single value, and controls the current source array by using the thermometer code digital signal.
It is clear to those skilled in the art from the foregoing description of the embodiments that, for convenience and simplicity of description, the foregoing division of the functional units is merely used as an example, and in practical applications, the above function distribution may be performed by different functional units according to needs, that is, the internal structure of the device may be divided into different functional units to perform all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (5)

1. A current steering type digital-to-analog converter based on thermometer codes is characterized in that: the digital-to-analog converter comprises a decoding circuit, a current source module, a comparator module, a load resistance module and a feedback resistance module, wherein one end of the decoding circuit is connected with a digital input signal, the other end of the decoding circuit is connected with one end of the current source module, the other end of the current source module is connected with the reverse input end of the comparator module, the output end of the comparator module is connected with one end of the feedback resistance module, and the other end of the feedback resistance module is respectively connected with the reverse input end of the comparator moduleThe reverse input end of the comparator module is connected with one end of the load resistance module, and the decoding circuit converts the digital input signal of the binary code into a digital control signal of the thermometer code; the comparator module comprises a comparator based on an operational amplifier, and a positive input end of the comparator is connected with a reference voltage Vref(ii) a The load resistance module comprises a load resistor R0Said load resistance R0The other end of the first and second electrodes is grounded; the feedback resistance module comprises a feedback resistor R1The feedback resistance R1One end of the feedback resistor R1 is connected to the input end of the comparator, and the other end of the feedback resistor R1 is connected to the inverting input end of the comparator; the output voltage Vout of the digital-to-analog converter is:
Figure FDA0003574522850000011
2. the thermometer code based current steering digital to analog converter as recited in claim 1 wherein: the digital input signal of the binary code is n bits, and n is a natural number which is more than or equal to 1.
3. The thermometer code based current steering analog-to-digital converter of claim 2 wherein: the decoding circuit inputs digital input signals D of n-bit binary codesnConversion to 2n-a digital control signal of a 1-bit thermometer code.
4. The thermometer code based current steering analog-to-digital converter of claim 3 wherein: the current source module comprises a current source array, and the current source array comprises I current sources I with the same current valueiEach of the current sources IiOne end of each current source I is connected with a corresponding digital control signaliAnother end of (1) and corresponding switch KiIs connected at one end, i is 1 to 2n-1, a natural number.
5. The thermometer code based current steering digital to analog converter as recited in claim 4 wherein: the switch KiThe other ends of the two input ends are sequentially connected and connected with the reverse input end of the comparator module.
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CN111900990A (en) * 2020-06-22 2020-11-06 东南大学 Current steering type digital-to-analog converter based on hybrid coding
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