CN106953639A - A kind of phase field analog-digital converter - Google Patents
A kind of phase field analog-digital converter Download PDFInfo
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- CN106953639A CN106953639A CN201710154193.XA CN201710154193A CN106953639A CN 106953639 A CN106953639 A CN 106953639A CN 201710154193 A CN201710154193 A CN 201710154193A CN 106953639 A CN106953639 A CN 106953639A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/18—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging
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Abstract
A kind of phase field analog-digital converter, includes the combiner and comparator of multiplexing, wherein：Combiner is zoomed in or out homophase input and the analog signal different weights of progress of orthogonal input；In-phase signal and orthogonal signalling after scaling is compared by comparator, obtains a quantization digital information；The zoom operation of combiner, is equivalent to being divided into complex plane into different sectors；The comparison operation of comparator, is equivalent to some sector that input signal phase is positioned at complex plane；At the time of different, combiner is according to the quantized result before comparator, different scalings are produced respectively, comparator accordingly produces the digital quantization output at next moment, phase quantization until completing specific precision, the present invention fully takes into account the characteristics of receiver is under different modulating mode and code check, active circuit is multiplexed as far as possible, the difficulty of phase information quantization is enormously simplify, the power consumption and cost of converter is reduced.
Description
Technical field
The invention belongs to Microelectronics and Solid State Electronics technical field, it is related to RF IC design, more particularly to
A kind of phase field analog-digital converter.
Background technology
In recent years, the development of the wireless communication technology such as cellular, bluetooth, wifi, zigbee is greatly enriched people
Daily life.Because the endurance of such Wireless Telecom Equipment largely influences Consumer's Experience, so in reduction equipment
The power consumption of wireless receiver is increasingly paid attention to.
In common wireless device, receiver amplifies radiofrequency signal and is mixed to intermediate frequency, using analog-digital converter simulation
Signal is converted into digital bit, and receiver digital demodulation device carries out computing to these digital bits, and demodulation obtains modulation intelligence.This
Wherein, analog-digital converter is the bridge between analog and digital signal, is by analog voltage half quantification not in the same time
One group of binary digit, these numerals can carry out a variety of computings, very flexibly and conveniently.Because traditional analog-digital converter is closed
Note is information of voltage, and we can be referred to as voltage domain analog-to-digital conversion device.Can unavoidably it be caused during voltage quantization
The loss of information, in order to which the information for ensureing analog signal is fully recorded, voltage domain analog-digital converter usually requires to meet specific
Speed and required precision.Experience have shown that, voltage domain analog-digital converter is often consumed than larger power consumption and circuit area,
Cost remains high.
Modulation demodulation system is in the majority with frequency and phase-modulation in current radio communication, rather than amplitude modulation(PAM).In frequency
In phase-modulation, information is loaded in the phase of modulated signal, rather than amplitude.Traditional voltage domain analog-digital converter will
After orthogonal two-way voltage quantization, by digital baseband computing, phase information therein is obtained indirectly, and then complete demodulation.In order to
Simplify demodulation, it is thus proposed that the theory of phase field analog-digital converter：By a kind of phase field converter, by the phase of analog signal
Position information is directly quantified as data signal, can more convenient and efficiently realization demodulation.There are some researches prove phase field analog-to-digital conversion
Device more saves power consumption and cost compared to voltage domain analog-digital converter, has important to current low-power consumption wireless receiver application
Value.
The content of the invention
In order to overcome the shortcoming of above-mentioned prior art, it is an object of the invention to provide a kind of phase field analog-digital converter,
The power consumption and cost of phase field analog-digital converter can be substantially reduced, it is adaptable to the equipment such as wireless receiver.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of phase field analog-digital converter, includes the combiner and comparator of multiplexing, wherein：
Combiner is zoomed in or out homophase input and the analog signal different weights of progress of orthogonal input；
In-phase signal and orthogonal signalling after scaling is compared by comparator, obtains a quantization digital information；
The zoom operation of combiner, is equivalent to being divided into complex plane into different sectors；The comparison operation of comparator, it is equivalent
Some sector of complex plane is positioned at for input signal phase.
Different at the time of, combiner produces different scalings respectively according to the quantized result before comparator.Example
Such as, if finding, in-phase branch signal is more than quadrature branch signal, and in-phase signal is reduced, quadrature signal amplification, to enter one
Step distinguishes the ratio of two tributary signals.Comparator accordingly produces the digital quantization output at next moment, special until completing
Determine the phase quantization of precision.
Compared with prior art, phase field analog-digital converter of the invention is both different from traditional voltage domain analog-to-digital conversion
Device, also different from traditional phase field analog-digital converter.It fully takes into account receiver under different modulating mode and code check
Feature, is multiplexed active circuit as far as possible, enormously simplify phase information quantization difficulty, reduce converter power consumption and into
This.
Brief description of the drawings
Fig. 1 is the phase field analog-digital converter structure block diagram of the present invention.
Fig. 2 is the phase field segmentation figure of one embodiment of the present of invention.
Fig. 3 is the combination device circuit structure chart of one embodiment of the present of invention.
Fig. 4 is 4 quantization flow figures of one embodiment of the present of invention.
Embodiment
Describe embodiments of the present invention in detail with reference to the accompanying drawings and examples.Following examples are used to illustrate this hair
It is bright, but it is not limited to the scope of the present invention.
As shown in figure 1, a kind of phase field analog-digital converter, includes the combiner and comparator of multiplexing, wherein：
Combiner is zoomed in or out homophase input and the analog signal different weights of progress of orthogonal input；
In-phase signal and orthogonal signalling after scaling is compared by comparator, obtains a quantization digital information；
The zoom operation of combiner, is equivalent to being divided into complex plane into different sectors；The comparison operation of comparator, it is equivalent
Some sector of complex plane is positioned at for input signal phase.
Different at the time of, combiner produces different scalings respectively according to the quantized result before comparator, than
The digital quantization output at next moment, the phase quantization until completing specific precision are accordingly produced compared with device.
Such as the complex plane phase field segmentation figure that Fig. 2 is the embodiment of the present invention.Different from traditional voltage domain analog-digital converter
Magnitude of voltage is subjected to quantization segmentation in a dimension, phase field analog-digital converter carries out quantization segmentation to phase information.This implementation
In example, quantization segmentation will be carried out with the complex plane mutually constituted with orthogonal signalling, complex plane is divided into 16 using 4 quantified precisions
Individual sector.Wherein each sector is to that should have unique coding, and coded system can be a variety of using thermometer code, binary code etc.
Mode.The present embodiment provides a kind of efficient binary coding mode, and is labeled in Fig. 2 each sector.By this 4 codings
Use B3B2B1B0To represent, wherein everybody physical significance is explained as follows.
B3：The polarity of in-phase branch signal；
B2：The polarity of quadrature branch signal；
B1：In-phase branch signal absolute value is more than quadrature branch signal absolute value；
B0：B1When=1, in-phase branch signal absolute value is more than 2.4 times of quadrature branch signal absolute value；
B1When=0,2.4 times of in-phase branch signal absolute value are more than quadrature branch signal absolute value；
This 4 codings use binary weights, and 180 °, 90 °, 45 ° and 22.5 ° are represented respectively by height.Phase is drawn
The border being divided between the sector of 16 approximate deciles, sector is respectively n*22.5 °, n=0,1 ..., 15.Such coded system
The information content of 4 bits is taken full advantage of, is wasted without redundancy, is conducive to saving power consumption.Moreover, the coding is fully with
Combination device circuit in text is engaged, and reduces active circuit scale and complexity.
Such as the combination device circuit structure chart that Fig. 3 is the embodiment of the present invention.Combiner includes circuits below module：Sampling is kept
Circuit 11, orthogonal switching circuit 12, integer combinations circuit 13.Wherein integer combinations circuit 13 includes being sequentially connected from power supply to ground
Numerical control transconductance cell 131, polarity switching circuit 132 and load circuit 133, wherein numerical control transconductance cell 131 has four groups.
Sampling hold circuit 11 is used for phase and quadrature branch analog input signal VI+,VI-,VQ+And VQ-Carry out specific frequency
The sampling of rate, and the voltage signal of sampling is kept in next cycle, it is combined for late-class circuit.Orthogonal switching circuit 12
For switch combination, its form as shown in Figure 3, can be realized, for switching in-phase signal and orthogonal signalling, just using double-pole switch
In simplified late-class circuit.When S3=1 is closure, in-phase signal and orthogonal signalling are not switched directly by the module；When
S3=0 is that in-phase signal and orthogonal signalling are exchanged when disconnecting.
Integer combinations circuit 13 is used for the integral multiple scaling for realizing in-phase branch signal and quadrature branch signal, scaling
For realizing n*22.5 ° of line of demarcation in Fig. 2 between sector.Here tan22.5 °=5/12, four signal branch point are approximately taken
Not Cai Yong 13 numerical control transconductance cells 131. pass through switching signal SIP<12:0>,SIN<12:0>,SQP<12:0>And SQN<12:0>Come
V is controlled respectivelyIP,VIN,VQPAnd VQNThe transconductance cell quantity of access, realizes that integer ratio is scaled.Here using PMOS as opening
Close, so when control signal is 0, switch closure；When control signal is 1, switch off.Polarity switching circuit 132 be connected on across
The drain terminal of unit 131 is led, when signal polarity is bears, switching signal positive pole and negative pole, it is ensured that output signal polarity is just.Letter
For list, polarity switching circuit 132 realizes the function of taking absolute value.Signal after being scaled and taking absolute value is in load circuit
133 drain terminal is converted to voltage, output to comparator.
Based on Fig. 2 phase divisions mode and Fig. 3 combination device circuits, one group of 4 quantization flow of the present embodiment are given in Fig. 4
Go out.The flow is from high coding B3B is encoded to low level0Carry out successively.
The first step quantifies to obtain B3, set S1=S2=S3=0 to be that all signals are straight-through and be not switched, SWIP=SWIN=
0000000000000 i.e. I roads signal opens all 13 branch road transconductance cells, SWQP=SWQN=1111111111111 i.e. Q roads
The whole 13 branch road transconductance cells of signal-off.So what comparator was exported is the polarity of I roads signal.
Second step quantifies to obtain B2, S1=1-B is set3I.e. I roads signal is taken absolute value, and S2=S3=0 is Q roads signal quilt
It is straight-through not to be switched, SWIP=SWINThe whole 13 branch road transconductance cells of=1111111111111 i.e. I roads signal-off, SWQP=
SWQN=0000000000000 i.e. Q roads signal opens all 13 branch road transconductance cells.So comparator output is Q roads signal
Polarity.
3rd step quantifies to obtain B1, S2=B is set2I.e. Q roads signal is taken absolute value, and S1 and S3 keep constant, SWIP=
SWIN=0000000001111 i.e. I roads signal opens 9 branch road transconductance cells, SWQP=SWQN=0000000001111 i.e. Q roads
Signal opens 9 branch road transconductance cells.So what comparator was exported is the comparative result of I roads and Q roads signal absolute value.
4th step quantifies to obtain B0, S3=1-B is set1, S1 and S2 keep constant, SWIP=SWIN=0000011111111
I.e. I roads signal opens 5 branch road transconductance cells, SWQP=SWQN=0000000000001 i.e. Q roads signal open 12 branch roads across
Lead unit.What is so obtained is the comparative result of I roads absolute value and 2.4 times of Q roads signal absolute values.
In this flow, the active circuit of combiner is by time-sharing multiplex, and rear class comparator is also fully multiplexed, reduced
The scale and power consumption of active circuit.
In different application demands, above-mentioned phase field cutting mode is different with precision possibility, coded system possibility is different,
The physical circuit implementation of combiner and comparator may also be different, it may also be desirable to introduce one or more in some applications
Phase field calibrates circuit.It should be pointed out that on the premise of for not departing from the inventive technique principle, changing the phase field analog-to-digital conversion
Quantified precision, coded system, circuit concrete structure and the calibration of device, which are improved, also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of phase field analog-digital converter, it is characterised in that combiner and comparator including multiplexing, wherein：
Combiner is zoomed in or out homophase input and the analog signal different weights of progress of orthogonal input；
In-phase signal and orthogonal signalling after scaling is compared by comparator, obtains a quantization digital information；
Different at the time of, combiner produces different scalings, comparator respectively according to the quantized result before comparator
Accordingly produce the digital quantization output at next moment, the phase quantization until completing specific precision.
2. phase field analog-digital converter according to claim 1, it is characterised in that the zoom operation of the combiner, equivalent
For complex plane to be divided into different sectors；The comparison operation of comparator, is equivalent to input signal phase and is positioned at complex plane
Some sector.
3. phase field analog-digital converter according to claim 1, it is characterised in that by with mutually and orthogonal signalling constitute it is multiple flat
Face carries out quantization segmentation, complex plane is divided into 16 sectors using 4 quantified precisions, wherein each sector is to that should have an only nothing
Two coding.
4. phase field analog-digital converter according to claim 3, it is characterised in that the coded system is temperature code or two
Scale coding.
5. phase field analog-digital converter according to claim 4, it is characterised in that the binary coding mode is：
With B3B2B1B04 codings are represented, its physical significance is as follows：
B3：The polarity of in-phase branch signal；
B2：The polarity of quadrature branch signal；
B1：In-phase branch signal absolute value is more than quadrature branch signal absolute value；
B0：B1When=1, in-phase branch signal absolute value is more than 2.4 times of quadrature branch signal absolute value；B1When=0, with phase branch
2.4 times of road signal absolute value are more than quadrature branch signal absolute value；
This 4 codings use binary weights, represent 180 °, 90 °, 45 ° and 22.5 ° respectively by height, phase is divided into
Border between the sector of 16 approximate deciles, sector is respectively n*22.5 °, n=0,1 ..., 15.
6. phase field analog-digital converter according to claim 1, it is characterised in that the combiner includes：
Sampling hold circuit (11), for phase and quadrature branch analog input signal VI+,VI-,VQ+And VQ-Carry out specific frequency
The sampling of rate, and signal is kept in next cycle, it is combined for late-class circuit；
Orthogonal switching circuit (12), for switching in-phase signal and orthogonal signalling, to simplify late-class circuit；
Integer combinations circuit (13), the integral multiple for realizing in-phase branch signal and quadrature branch signal is scaled.
7. phase field analog-digital converter according to claim 6, it is characterised in that the orthogonal switching circuit (12) is switch
Combination, the integer combinations circuit (13) includes numerical control transconductance cell (131), the polarity switching electricity being sequentially connected from power supply to ground
Road (132) and load circuit (133), wherein numerical control transconductance cell (131) have four groups, and switch, polarity are used as using PMOS
Switching circuit (132) is switch combination, is connected on the drain terminal of numerical control transconductance cell (131) PMOS, when signal polarity is bears, is cut
Change signal positive pole and negative pole, it is ensured that output signal polarity is just, the signal after being scaled and taking absolute value is in load circuit
(133) drain terminal is converted to voltage, output to comparator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710154193.XA CN106953639B (en) | 2017-03-15 | 2017-03-15 | Phase domain analog-to-digital converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710154193.XA CN106953639B (en) | 2017-03-15 | 2017-03-15 | Phase domain analog-to-digital converter |
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| CN106953639A true CN106953639A (en) | 2017-07-14 |
| CN106953639B CN106953639B (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111107029A (en) * | 2018-10-25 | 2020-05-05 | 深圳市中兴微电子技术有限公司 | Orthogonal frequency division multiplexing demodulator, demodulation method and receiver |
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| CA2422794A1 (en) * | 2000-09-19 | 2002-03-28 | Tom Riley | Complex valued delta sigma phase locked loop demodulator |
| CN101036359A (en) * | 2004-08-12 | 2007-09-12 | 德州仪器公司 | Method and apparatus for a fully digital quadrature modulator |
| CN104730975A (en) * | 2013-12-24 | 2015-06-24 | 恩智浦有限公司 | Phase estimator |
| CN105471434A (en) * | 2014-09-25 | 2016-04-06 | 英特尔Ip公司 | Digital to analog converter circuits, apparatus and method, and methods of digital to analog conversion |
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2017
- 2017-03-15 CN CN201710154193.XA patent/CN106953639B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2422794A1 (en) * | 2000-09-19 | 2002-03-28 | Tom Riley | Complex valued delta sigma phase locked loop demodulator |
| CN101036359A (en) * | 2004-08-12 | 2007-09-12 | 德州仪器公司 | Method and apparatus for a fully digital quadrature modulator |
| CN104730975A (en) * | 2013-12-24 | 2015-06-24 | 恩智浦有限公司 | Phase estimator |
| CN105471434A (en) * | 2014-09-25 | 2016-04-06 | 英特尔Ip公司 | Digital to analog converter circuits, apparatus and method, and methods of digital to analog conversion |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111107029A (en) * | 2018-10-25 | 2020-05-05 | 深圳市中兴微电子技术有限公司 | Orthogonal frequency division multiplexing demodulator, demodulation method and receiver |
| US11329855B2 (en) | 2018-10-25 | 2022-05-10 | Sanechips Technology Co., Ltd. | Orthogonal frequency division multiplexing demodulator, demodulation method, and receiver |
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