CN104348484B - A kind of more bit moduli converters of continuous time for digital microphone - Google Patents
A kind of more bit moduli converters of continuous time for digital microphone Download PDFInfo
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- CN104348484B CN104348484B CN201310330578.9A CN201310330578A CN104348484B CN 104348484 B CN104348484 B CN 104348484B CN 201310330578 A CN201310330578 A CN 201310330578A CN 104348484 B CN104348484 B CN 104348484B
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Abstract
The present invention relates to signal processing technology fields, and in particular to a kind of analog-digital converter.A kind of more bit moduli converters of continuous time for digital microphone, applied to digital microphone, the second functional unit being connect including the first functional unit, with the first functional unit, first functional unit receives analog input signal by signal input part, and the signal input part of the second functional unit is connected by signal output end, the first functional unit includes multiple integrators cascade successively, a multi-bit quantizer, a multi-bit digital-to-analog converter, an adder；Adder is located at the input terminal of first integrator；First functional unit is used to analog input signal being converted to more bit streams；Second functional unit is used to convert more bit streams to the output of single-bit code stream.The present invention reduces the exponent numbers of integrator, reduce the power consumption and system complexity of analog-digital converter, while increasing the dynamic range of analog-digital converter input.
Description
Technical field
The present invention relates to signal processing technology fields, and in particular to a kind of analog-digital converter.
Background technology
As electronic equipment for consumption product is to audio area increasingly higher demands, sigma delta modulator conduct
A kind of effective way for realizing high-resolution Analog-digital Converter, increasingly attracts attention, and be widely used in audio signal processing technique
Field.
It is usually used in the analog-digital converter of digital microphone in the prior art for single-bit quadravalence sigma delta modulus to turn
Parallel operation, as shown in Figure 1 comprising cascade first rank integrator successively（stg1）, second-order integrator（stg2）, third rank product
Divide device（stg3）And fourth order integrator（stg4）；Further include an One-bit quantizers (1bit_adc), a digital analog converter
（1bit dac）An and adder；Input signal（in）By above-mentioned analog-digital converter, final output signal（1bit
dout）For one-bit digital PDM（Pulse-Density Modulated, pulse density modulated code）Code stream, to meet digital microphone
Demand of the wind professional standard to single-bit PDM code streams.
Since integrator is the main power consumption unit in analog-digital converter, certainly will be improved using the integrator of multiple exponent numbers
The power consumption and complexity of system cannot be satisfied requirement of the electronic equipment for consumption to the high-resolution analog-digital converter of low-power consumption.
Invention content
The object of the present invention is to provide a kind of more bit moduli converters of continuous time for digital microphone, solutions
The certainly above technical problem.
Following technical scheme may be used to realize in technical problem solved by the invention：
A kind of more bit moduli converters of continuous time for digital microphone are applied to digital microphone, wherein packet
The second functional unit for including the first functional unit and being connect with first functional unit, first functional unit include a letter
Number input terminal, a signal output end, first functional unit receives analog input signal by the signal input part, and leads to
Cross the signal input part that the signal output end connects second functional unit；
First functional unit includes multiple integrators cascade successively, a multi-bit quantizer, one for feedback
Multi-bit digital-to-analog converter, an adder；The adder is located therein the input terminal of first integrator；
The multi-bit quantizer is used to receive the output signal of every level-one integrator and is quantified as digital signal；It is described more
The digital signal that the multi-bit quantizer obtains is converted to analog signal by bit digital-to-analog converter；The adder is for connecing
The analog feedback signal of the multi-bit digital-to-analog converter conversion is received, and poor is asked to analog input signal and analog feedback signal,
Obtain error signal；
First functional unit is used to analog input signal being converted to more bit streams；Second functional unit is used
It is exported in converting more bit streams to single-bit code stream.
Preferably, the integrator uses continuous time integrator.
Preferably, the integrator includes an operational amplifier, and it is defeated that the operational amplifier is equipped with in-phase input end, reverse phase
Enter end, the homophase input terminates a reference signal；
The output signal end that the inverting input of the integrator passes through integrator described in a capacitance connection；And/or it is described
The inverting input of integrator connects input signal or the output signal of upper level integrator by a resistance.
Preferably, second functional unit includes multiple digital integrators cascade successively, a single-bit encoder, one
More bit encoders, a digital adder, the digital adder are located at the input terminal of first digital integrator；
The single-bit encoder is used to receive the output signal of each grade of digital integrator and is encoded；It is described to compare more
The digital signal that single-bit encoder obtains is converted to more bits of encoded signals by special encoder；The digital adder receives institute
More bits of encoded signals are stated, and poor is asked to input signal and encoded signal, obtain error signal.
Preferably, the digital integrator uses the trigger of D types.
Preferably, first functional unit includes m integrators cascade successively；The multi-bit quantizer is a n
Multi-bit quantizer；The multi-bit digital-to-analog converter is a n-bit digital analog converter；Wherein m, n are respectively one more than or equal to 1
Positive integer.
Preferably, second functional unit includes m digital integrators cascade successively；More bit encoders are
One n-bit encoder；
Wherein m, n are respectively a positive integer for being more than or equal to 1.
Preferably, first functional unit includes 2 cascade integrators successively；
And/or the multi-bit quantizer is one 4 multi-bit quantizers；The multi-bit digital-to-analog converter is one 4 bit numbers
Mode converter.
Preferably, second functional unit includes 2 cascade digital integrators successively；And/or more bits are compiled
Code device is one 4 bit encoders.
Advantageous effect：Due to using the technology described above, The present invention reduces the exponent number of integrator, analog-to-digital conversion is reduced
The power consumption and system complexity of device, while increasing the dynamic range of analog-digital converter input.
Description of the drawings
Fig. 1 is the single-bit quadravalence sigma delta analog-digital converter schematic diagram of the prior art；
Fig. 2 is the structural schematic diagram for the first functional unit that the present invention uses；
Fig. 3 is a kind of schematic diagram of specific embodiment of Fig. 2；
Fig. 4 is the structural schematic diagram of the integrator of the first functional unit of the present invention；
Fig. 5 is the structural schematic diagram for the second functional unit that the present invention uses；
Fig. 6 is more bit moduli converter schematic diagrames that the present invention is used for digital microphone.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of not making creative work it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The invention will be further described in the following with reference to the drawings and specific embodiments, but not as limiting to the invention.
With reference to Fig. 2, Fig. 3, Fig. 5, Fig. 6, a kind of more bit moduli converters of continuous time for digital microphone, application
In digital microphone, wherein the second functional unit 2 being connect including the first functional unit 1 and with the first functional unit 1, first
Functional unit 1 includes a signal input part, a signal output end, and the first functional unit 1 is defeated by signal input part reception simulation
Enter signal, and connect the signal input part of the second functional unit 2 by signal output end, the first functional unit 1 include it is multiple according to
Secondary cascade integrator, a multi-bit quantizer, a multi-bit digital-to-analog converter, an adder；Adder is located at first product
Divide the input terminal of device；Multi-bit quantizer is used to receive the output signal of every level-one integrator and is quantified as digital signal；Compare more
The digital signal that multi-bit quantizer obtains is converted to analog signal by special digital analog converter；Adder is for receiving multi-bit
The analog feedback signal of mode converter conversion, and poor is asked to analog input signal and analog feedback signal, obtain error signal；The
One functional unit 1 is used to analog input signal being converted to more bit streams；Second functional unit 2 is for circulating more bit codes
Turn to the output of single-bit code stream.
Since single-bit code stream is compared with more bit streams, all information are included in one data flow, subsequent
Processing directly can carry out signal processing to one data flow, and delay when avoiding data multiplex transmission is inconsistent and data
Interference between line, while the processing speed of circuit can be improved.The present invention, which uses, converts as single-bit more bit streams to
Code stream exports, to meet digital microphone Industry code requirements.
With reference to Fig. 4, the integrator of the first functional unit of the invention uses continuous time integrator.Above-mentioned integrator is main
Including an operational amplifier 21, operational amplifier 21 is equipped with in-phase input end, and inverting input, homophase input termination one is with reference to letter
Number（Vcm）；The inverting input of integrator passes through a capacitance（C1）Connect the output signal end of integrator；And/or integrator is logical
Cross a resistance（R1）Connect input signal（in）Or the output signal of upper level integrator.
First functional unit uses continuous time integrator, and realize realizes the more of continuous time to analog input signal
Bit moduli is converted, and reduces the switching noise and quiescent current of analog-digital converter.Continuous time sigma delta tune
The power consumption of device processed is usually smaller than discrete time sigma delta modulator, is particularly suitable at a high speed, in the application of low-power consumption.
The first functional unit of the present invention also uses multi-bit quantizer, relative to One-bit quantizers, more bits simultaneously
Quantizer can reduce dependence of the quantization gain to input signal so that the linearity of feedback control loop is improved, and compares more
Special quantizer can improve the saturation input of modulator, and the stabilization of system is also increased while increasing signal input range
Property.
The second functional unit 2 of the present invention includes multiple digital integrators cascade successively, a single-bit encoder
（1bit_code）, bit encoder more than one, a digital adder, digital adder is located at the input of first digit integrator
End；Single-bit encoder is used to receive the output signal of each grade of digital integrator and is encoded；More bit encoders will be single
The digital signal that bit encoder obtains is converted to more bits of encoded signals；Digital adder receives more bits of encoded signals, and
Poor is asked to input signal and encoded signal, obtains error signal.
With reference to Fig. 2, the first functional unit 1 of the invention includes m integrators cascade successively；Respectively first integrator
(stg1), second integral device (stg2),..., m-1 integrators (stgm-1), m integrators (stgm)；One n-bit quantizer
（nbit_adc）；One n-bit digital analog converter（nbit dac）And an adder, analog input signal（In）By the first function
Unit obtains n-bit code stream（nbit dout）；
With reference to Fig. 5, the second functional unit 2 includes m digital integrators cascade successively；Respectively the first digital integrator
(stg1 ＇), the second digital integrator (stg ＇),..., m-1 digital integrators (stgm-1 ＇), m digital integrators
(stgm ＇)；One single-bit encoder（1bit_code）, a n-bit encoder (nbit_code) and a digital adder；N ratios
Special code stream（nbit dout）Single-bit code stream is obtained by the second functional unit（1bit dout）.
Above-mentioned m, n are respectively a positive integer for being more than or equal to 1.
Above-mentioned digital integrator uses the trigger of D types（DFF）It realizes.
With reference to Fig. 3, for a kind of specific embodiment of the first functional unit 1 of the present invention, four bit of a feed-forward type, two rank west
Lattice agate Delta analog-digital converter, the first functional unit 1 include two cascade integrators successively（Stg1, stg2）；More bits
Quantizer is one or four multi-bit quantizers（4bit_adc）；More bit encoders are one or four bit encoders（4bit_code）.Compare more
Special digital analog converter is one or four bit digital-to-analog converters（4bit dac）.Analog input signal（In）It is obtained by the first functional unit
Obtain 4 bit streams（4bit dout）.
The first functional unit of the present invention uses more bit sigma delta analog-digital converters, the digital ratio with the prior art
Special sigma delta analog-digital converter is compared, and is had the advantage that：
1）Identical signal-to-noise ratio is realized, the exponent number of integrator is reduced, reduces system power dissipation and complexity；
2）To clock jitter（jitter）Susceptibility be the 2 of single bit sigma Delta analog-digital converter-NTimes, to
Relax the requirement to system clock；
3）The period signal of more bit sigma delta analog-digital converters generates（idle tone）Much smaller than single-bit west
Lattice agate Delta analog-digital converter, it is possible to need not additionally increase analog-digital converter（ADC）The offset voltage of input presses down
Period signal processed generates, to increase the dynamic range of analog-digital converter input.
The first functional unit of the present invention is realized in analog domain, i.e., mainly by analog circuit, including amplifier,
The realizations such as integrator, comparator；The second functional unit of the present invention is realized in pure digi-tal domain, i.e., mainly passes through digital electricity
Road, including trigger（Such as D type flip-flops）, logic gates（logic gate）, the realizations such as plus/minus musical instruments used in a Buddhist or Taoist mass.
The sigma delta modulator of the present invention is not limited only to feed-forward type, can also use other configurations, such as feed back
Type, MASH types etc., you can be used cooperatively with any sigma delta framework.
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (8)
1. a kind of more bit moduli converters of continuous time for digital microphone, are applied to digital microphone, feature exists
In, including the first functional unit and the second functional unit for being connect with first functional unit, the first functional unit packet
A signal input part, a signal output end are included, first functional unit receives simulation input by the signal input part to be believed
Number, and connect by the signal output end signal input part of second functional unit；
First functional unit includes multiple integrators cascade successively, a multi-bit quantizer, more comparing for feedback
Special digital analog converter, an adder；The adder is located therein the input terminal of first integrator；More bit quantities
Change device to be used to receive the output signal of every level-one integrator and be quantified as digital signal；The multi-bit digital-to-analog converter will be described
The digital signal that multi-bit quantizer obtains is converted to analog signal；The adder is for receiving the multi-bit mould conversion
The analog feedback signal of device conversion, and poor is asked to analog input signal and analog feedback signal, obtain error signal；Described first
Functional unit is used to analog input signal being converted to more bit streams；
Second functional unit is used to convert more bit streams to the output of single-bit code stream；Second functional unit includes
Multiple digital integrators cascade successively, a single-bit encoder, bit encoder more than one, a digital adder, the number
Adder is located at the input terminal of first digital integrator；
The single-bit encoder is used to receive the output signal of each grade of digital integrator and is encoded；More bits are compiled
The digital signal that single-bit encoder obtains is converted to more bits of encoded signals by code device；The digital adder receives described more
Bits of encoded signal, and poor is asked to input signal and encoded signal, obtain error signal.
2. more bit moduli converters of a kind of continuous time for digital microphone according to claim 1, feature
It is, the integrator of first functional unit uses continuous time integrator.
3. more bit moduli converters of a kind of continuous time for digital microphone according to claim 2, feature
It is, the integrator of first functional unit includes an operational amplifier, and the operational amplifier is equipped with in-phase input end, anti-
Phase input terminal, the homophase input terminate a reference signal；
The integral that the inverting input of the integrator of first functional unit passes through the first functional unit described in a capacitance connection
The output signal end of device；And/or the inverting input of the integrator of first functional unit connects input letter by a resistance
Number or upper level integrator output signal.
4. more bit moduli converters of a kind of continuous time for digital microphone according to claim 1, feature
It is, the digital integrator uses the trigger of D types.
5. more bit moduli converters of a kind of continuous time for digital microphone according to claim 1, feature
It is, first functional unit includes m integrators cascade successively；The multi-bit quantizer is a n-bit quantizer；
The multi-bit digital-to-analog converter is a n-bit digital analog converter；Wherein m, n are respectively a positive integer for being more than or equal to 1.
6. more bit moduli converters of a kind of continuous time for digital microphone according to claim 1, feature
It is, second functional unit includes m digital integrators cascade successively；More bit encoders are compiled for a n-bit
Code device；
Wherein m, n are respectively a positive integer for being more than or equal to 1.
7. more bit moduli converters of a kind of continuous time for digital microphone according to claim 5, feature
It is, first functional unit includes 2 cascade integrators successively；
And/or the multi-bit quantizer is one 4 multi-bit quantizers；The multi-bit digital-to-analog converter turns for one 4 bit digital-to-analogues
Parallel operation.
8. more bit moduli converters of a kind of continuous time for digital microphone according to claim 6, feature
It is, second functional unit includes 2 cascade digital integrators successively；And/or more bit encoders are one 4 ratios
Special encoder.
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| EP1014674A1 (en) * | 1998-12-23 | 2000-06-28 | Nokia Mobile Phones Ltd. | A method and a telecommunication apparatus for creating an alerting signal |
| CN1879446A (en) * | 2003-11-24 | 2006-12-13 | 桑尼奥公司 | Microphone comprising integral multi-level quantizer and single-bit conversion means |
| CN101547389A (en) * | 2008-03-28 | 2009-09-30 | 索尼株式会社 | Headphone device, signal processing device, and signal processing method |
| CN203522712U (en) * | 2013-07-31 | 2014-04-02 | 上海耐普微电子有限公司 | Continuous multi-bit analog-to-digital converter for digital microphone |
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| EP1014674A1 (en) * | 1998-12-23 | 2000-06-28 | Nokia Mobile Phones Ltd. | A method and a telecommunication apparatus for creating an alerting signal |
| CN1879446A (en) * | 2003-11-24 | 2006-12-13 | 桑尼奥公司 | Microphone comprising integral multi-level quantizer and single-bit conversion means |
| CN101547389A (en) * | 2008-03-28 | 2009-09-30 | 索尼株式会社 | Headphone device, signal processing device, and signal processing method |
| CN203522712U (en) * | 2013-07-31 | 2014-04-02 | 上海耐普微电子有限公司 | Continuous multi-bit analog-to-digital converter for digital microphone |
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