CN101364807B - Triangular integration modulator and related method thereof - Google Patents
Triangular integration modulator and related method thereof Download PDFInfo
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- CN101364807B CN101364807B CN2007101409400A CN200710140940A CN101364807B CN 101364807 B CN101364807 B CN 101364807B CN 2007101409400 A CN2007101409400 A CN 2007101409400A CN 200710140940 A CN200710140940 A CN 200710140940A CN 101364807 B CN101364807 B CN 101364807B
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Abstract
A sigma-delta modulator comprises a loop filter for filtering an addition signal to generate a filtered signal; a single-bit quantizer coupled with the loop filter for quantizing the filtered signal to generate a quantized signal; a single-bit adjustable digital/analog converter coupled with the single-bit quantizer, having an adjustable configuration and used for generating a feedback signal according to the quantized signal and the configuration; and an adder coupled with the loop filter and the single-bit adjustable digital/analog converter for adding an input signal to the feedback signal to generate the addition signal.
Description
Technical field
The present invention relates to triangular integration modulator, particularly use can be adjusted the triangular integration modulator of the digital/analog converter of configuration.
Background technology
Among the field of signal processing; use triangular integration modulator (Sigma-DeltaModulator) to come processing signals through regular meeting, triangular integration modulator can be divided into numerous species: continuous time (continuous time), discontinuous time (discrete time), single order (order) or multistage, single one or more etc.Generally speaking, if desire improves the dynamic range (dynamicrange) of input signal, then must increase the exponent number or the figure place of triangular integration modulator.Yet, can make state labile if improve exponent number, and increase figure place, if extra process not can import nonlinear feedback signal, make to add resultant signal and be non-linear, thereby reduce the linearity of total system.Figure 1A shows this kind situation, and shown in Figure 1A, the feedback signal that digital/analog converter produced of single position must be linearity, yet the digital/analog converter of multidigit makes feedback signal produce nonlinear situation easily.Under this kind situation, need extra algorithm or circuit to keep or proofread and correct the linearity, therefore can cause the extra burden of system.
Some triangular integration modulator can change the configuration of its some element and adjust its gain.Figure 1B shows the triangular integration modulator 100 of prior art, this triangular integration modulator 100 is exposed in KathleenPhilips, etc., " A Continuous-Time ∑ Δ ADC With Increased Immunity toInterferers; " 2004 IEEE Journal of Solid-State Circuits, vol.39, no.12, pp 2170-2177.As shown in Figure 1, triangular integration modulator 100 comprises a plurality of variable resistors 101, and it is in order to adjust the gain of triangular integration modulator 100.Variable resistor 101 is positioned on the path of signal input, and the variable resistor in triangular integration modulator presents with the variable resistor module 103 shown in Figure 1B usually, and its switching by switch decides its resistance value.Yet the non-linear resistance of this switch but may cause signal to produce nonlinear situation, therefore makes system produce distortion (distortion).The detailed description of other element has been exposed in the above-mentioned paper, so do not repeat them here.
Summary of the invention
Therefore, a purpose of the present invention is for providing a kind of triangular integration modulator and associated method, it has comprised the digital/analog converter that can adjust configuration, can adjust the feedback current of digital/analog converter by the electric capacity of adjusting this digital/analog converter, resistance, curtage, to address the above problem.
One embodiment of the invention have disclosed a kind of triangular integration modulator, comprise: a loop filter, implement the filtering action to produce signal after the filtering in order to add resultant signal to one; One single quantizer is coupled to this loop filter, quantizes action to produce a quantized signal in order to signal after this filtering is implemented one; One single tunable integers word/analog converter, be coupled to this single position quantizer, this single position tunable integers word/analog converter has an adjustable configuration, and this single position tunable integers word/analog converter is in order to produce a feedback signal according to this quantized signal and this configuration; And an adder, be coupled to this loop filter and this single position tunable integers word/analog converter, add resultant signal in order to add up an input signal and this feedback signal to produce this.
In triangular integration modulator of the present invention, this single position tunable integers word/analog converter comprises one first configuration initialization circuit, and this first configuration initialization circuit comprises: a resistance; One first switch is coupled to this resistance; One second switch is coupled to this first switch and one first voltage; One the 3rd switch is coupled to this first switch and a common voltage; And one the 4th switch, be coupled to this resistance and one second voltage; Wherein, the action of this first switch, this second switch, the 3rd switch and the 4th switch is to move according to this quantized signal, and this resistance, this first voltage, this common voltage and this second voltage wherein at least one be adjustable.
In triangular integration modulator of the present invention, this feedback signal of this single position tunable integers word/analog converter is to be exported by two differential output ends, and this single position tunable integers word/analog converter comprises one second configuration initialization circuit, this first configuration initialization circuit and this second configuration initialization circuit are coupled to this two differential output end respectively, and this first configuration initialization circuit and this second configuration initialization circuit have components identical and structure.
In triangular integration modulator of the present invention, this single position tunable integers word/analog converter comprises one first configuration initialization circuit, and this first configuration initialization circuit comprises: an outgoing route is coupled to this adder; One electric capacity; One first switch is coupled to this outgoing route and this electric capacity; One second switch is coupled to common voltage and this electric capacity; And one the 3rd switch, be coupled to this electric capacity and one first voltage; Wherein, the action of this first switch, this second switch and the 3rd switch is to move according to this quantized signal, and this electric capacity, this common voltage and this first voltage wherein at least one be adjustable.
In triangular integration modulator of the present invention, this feedback signal of this single position tunable integers word/analog converter is to be exported by two differential output ends, and this single position tunable integers word/analog converter comprises one second configuration initialization circuit, this first configuration initialization circuit and this second configuration initialization circuit are coupled to this two differential output end respectively, and this first configuration initialization circuit and this second configuration initialization circuit have components identical and structure.
In triangular integration modulator of the present invention, the 3rd switch of this second configuration initialization circuit couples this electric capacity to one second voltage of this second configuration initialization circuit, and this first magnitude of voltage and this second magnitude of voltage are different.
In triangular integration modulator of the present invention, this single position tunable integers word/analog converter comprises one first configuration initialization circuit, and this first configuration initialization circuit comprises: an outgoing route is coupled to this adder; One adjustable current source; And a switch, be coupled to this adjustable current source and this outgoing route, move according to this quantized signal.
In triangular integration modulator of the present invention, this feedback signal of this single position tunable integers word/analog converter is exported by two differential output ends, and this single position tunable integers word/analog converter comprises one second configuration initialization circuit, this first configuration initialization circuit and this second configuration initialization circuit are coupled to this two differential output end respectively, and this first configuration initialization circuit and this second configuration initialization circuit have components identical and structure.
In triangular integration modulator of the present invention, the adjustable current source of this of this second configuration initialization circuit has different current values with this adjustable current source of this first configuration initialization circuit.
Embodiments of the invention have also disclosed a kind of signal modulating method, and it corresponds to above-mentioned triangular integration modulator, and the method comprises: (a) add resultant signal to one and implement the filtering action to produce signal after the filtering; (b) signal after this filtering is implemented one and quantize action to produce a quantized signal; (c) provide one single tunable integers word/analog converter, this single position tunable integers word/analog converter has an adjustable configuration, in order to produce a feedback signal according to this quantized signal and this configuration; And (d) add up an input signal and this feedback signal and add resultant signal to produce this.
In signal modulating method of the present invention, should (c) step comprise: provide a resistance, one first voltage, a common voltage and one second voltage with some as this single position tunable integers word/analog converter; According to this quantized signal export this common voltage, this first voltage, this second voltage one of them to this resistance; And utilize this resistance, this first voltage, this common voltage and this second voltage to produce this feedback signal; Wherein, this resistance, this first voltage, this common voltage and this second voltage wherein at least one be adjustable.
In signal modulating method of the present invention, should (c) step comprise: provide an electric capacity, a common voltage and one first voltage with some as this single position tunable integers word/analog converter; And utilize this electric capacity, this common voltage and this first voltage and produce this feedback signal according to this quantized signal; And this electric capacity, this common voltage and this first voltage wherein at least one be adjustable.
In signal modulating method of the present invention, should (c) step comprise: the part of an adjustable current source as this single position tunable integers word/analog converter is provided; And utilize this adjustable current source and produce this feedback signal according to this quantized signal.
By above-mentioned structure and method, visual demand is adjusted the configuration of digital/analog converter, and has other benefit, will describe in detail in the explanation down below.
Description of drawings
Figure 1A shows the non-linear situation of long number/analog converter in the prior art.
Figure 1B shows the triangular integration modulator of prior art.
Fig. 2 shows triangular integration modulator according to an embodiment of the invention.
Fig. 3 to Fig. 5 shows an embodiment of the detailed structure of single position tunable integers word/analog converter among Fig. 2.
Fig. 6 shows the signal modulating method of corresponding diagram 2 to structure shown in Figure 5.
Fig. 7 shows the comparison diagram according to the triangular integration modulator of triangular integration modulator of the present invention and prior art.
The reference numeral explanation
100,200 trigonometric integral modulation circuits
101 variable resistors
103 variable resistor modules
201 loop filters
203 single quantizers
205 single tunable integers word/analog converters
207 adders
300,400,500 configuration initialization circuits
301 resistance
303,405 first switches
305,407 second switches
307,409 the 3rd switches
309 the 4th switches
311,313,315 unit voltage gain amplifiers
401,501 outgoing routes
403 electric capacity
503 adjustable current sources
505 switches.
Embodiment
In the middle of specification and follow-up claim, used some vocabulary to censure specific element.The person with usual knowledge in their respective areas should understand, and hardware manufacturer may be called same element with different nouns.This specification and follow-up claim are not used as distinguishing the mode of element with the difference of title, but the criterion that is used as distinguishing with the difference of element on function.Be an open term mentioned " comprising " in the middle of specification and the follow-up request item in the whole text, so should be construed to " comprise but be not limited to ".In addition, " couple " speech and comprise any indirect means that are electrically connected that directly reach at this.Therefore, be coupled to one second device, then represent this first device can directly be electrically connected in this second device, or be electrically connected to this second device indirectly by other device or connection means if describe one first device in the literary composition.
Fig. 2 shows triangular integration modulator 200 according to an embodiment of the invention.As shown in Figure 2, triangular integration modulator 200 comprises a loop filter 201, one single quantizer 203, one single tunable integers word/analog converter 205 and an adder 207.Loop filter 201 is implemented the filtering action to produce signal FS after the filtering in order to add resultant signal SS to one.Single position quantizer 203 quantizes action to produce a quantized signal QS in order to signal FS after the filtering is implemented one.Single position tunable integers word/analog converter 205 has an adjustable configuration, and in order to produce a feedback signal FES according to this quantized signal QS and configuration.Adder 207 adds resultant signal SS in order to add up an input signal IS and feedback signal FES with generation.Generally speaking, single position quantizer 203 is coupled to a digital filter or a sampling filter (decimation filter), but is not in order to limit the present invention.
As know this skill person and know, triangular integration modulator can comprise an integrator usually, and the signal that adds the General Logistics Department is made integration to remove high frequency or noise component, and with the quality of raising signal, and above-mentioned loop filter 201 is to use as integrator.
By above-mentioned structure, can adjust the electric capacity, resistance, curtage of single position tunable integers word/analog converter 205 to adjust the configuration of single position tunable integers word/analog converter 205 according to demand.Compared to structure shown in Figure 1, because embodiment shown in Figure 2 is a configuration of adjusting single position tunable integers word/analog converter 205, and single position tunable integers word/analog converter 205 is not to be positioned on the path of signal input, that is be not to be positioned on the path of input signal IS, therefore can avoid the shortcoming of above-mentioned available circuit.Beneath some embodiment that the detailed structure of single position tunable integers word/analog converter 205 will be described in detail in detail, and detailed operation between loop filter 201, single position quantizer 203, single position tunable integers word/analog converter 205 and the adder 207 and signal relation be owing to can be and know this skill person and push away, so do not repeat them here.
Fig. 3 to Fig. 5 shows an embodiment of the detailed structure of single position tunable integers word/analog converter 205 among Fig. 2, is please joining Fig. 2 and Fig. 3 to Fig. 5 alternately, more to understand the present invention.As shown in Figure 3, single position tunable integers word/analog converter 205 shown in Figure 2 comprises two configuration initialization circuits 300, and each configuration initialization circuit 300 comprises a resistance 301, one first switches 303, a second switch 305, one the 3rd switch 307 and one the 4th switch 309.Second switch 305 is coupled to first switch 303 and one first voltage V
1The 3rd switch 307 is coupled to first switch 303 and a common voltage V
CMThe 4th switch 309 is coupled to resistance 301 and one second voltage V
2Wherein the action of first switch 303, second switch 305, the 3rd switch 307 and the 4th switch 309 is to move according to the quantized signal QS among Fig. 2.Resistance 301, the first voltage V
1, common voltage V
CMAnd the second voltage V
2Wherein one is adjustable at least, and the first voltage V
1With common voltage V
CM, the second voltage V
2With common voltage V
CMConstituted the reference voltage of single position tunable integers word/analog converter 205 respectively.By the action of control first switch 303, second switch 305, the 3rd switch 307 and the 4th switch 309 and resistance 301, the first voltage V
1, common voltage V
CMAnd the second voltage V
2Value, can produce feedback signal FES on demand to feedback path.
It is noted that, in the embodiment shown in fig. 3, more be coupled to first switch 303, second switch 305, the 3rd switch 307, the 4th switch 309 and the first voltage V with unit voltage gain amplifier 311,313 and 315 (gain is 1)
1, common voltage V
CMAnd the second voltage V
2Between, with usefulness as buffer.As know this skill person and know, unit voltage gain amplifier 311,313 and 315 can be used as the usefulness of buffer, with isolation load and input signal, and provides high input and low output impedance, improves the usefulness of circuit by this.But be not that expression single position of the present invention tunable integers word/analog converter 205 must comprise unit gain voltage amplifier 311,313 and 315.
In addition, in the embodiment shown in fig. 3, the feedback signal FES of single position tunable integers word/analog converter 205 is exported by two differential output ends, therefore must there be two configuration initialization circuits 300 to form a feedback signal FES to export two signals, but be not in order to limit the present invention, if single position tunable integers word/analog converter 205 only has an output, then can only use a configuration initialization circuit 300.
And in the embodiment shown in fig. 4, single position tunable integers word/analog converter 205 comprises two configuration initialization circuits 400, and each configuration initialization circuit 400 comprises: an outgoing route 401, an electric capacity 403, one first switch 405, a second switch 407 and one the 3rd switch 409.Outgoing route 401 is coupled to adder 207, the first switches 405 and is coupled to outgoing route 401 and electric capacity 403,
Same, in the embodiment shown in fig. 4, the feedback signal FES of single position tunable integers word/analog converter 205 is exported by two differential output ends, therefore must there be two configuration initialization circuits 400 to form feedback signal to export two signals, and these two configuration initialization circuits 400 can be coupled to the other side's voltage (V1 or V2) or outgoing route mutually, but are not in order to limit the present invention.If single position tunable integers word/analog converter 205 only has an output, then can only use a configuration initialization circuit 400.
In the embodiment shown in fig. 5, single position tunable integers word/analog converter 205 comprises two configuration initialization circuits 500, and each configuration initialization circuit 500 comprises an outgoing route 501, one adjustable current source 503 and (has current value I
1Or I
2, and current value I
1With I
2Inequality) and a switch 505.Outgoing route 501 is coupled to adder 207, and switch 505 is coupled to adjustable current source 503 and outgoing route 501.
Same, in the embodiment shown in fig. 5, the feedback signal FES of single position tunable integers word/analog converter 205 is exported by two differential output ends, therefore must there be two configuration initialization circuits 500 to form feedback signal FES to export two signals, and these two configuration initialization circuits 500 can be coupled to the other side's outgoing route 501 mutually, but are not in order to limit the present invention.If single position tunable integers word/analog converter 205 only has an output, then can only use a configuration initialization circuit 500.
Fig. 6 shows the signal modulating method of corresponding diagram 2 to structure shown in Figure 5.The method comprises:
Add resultant signal SS to one and implement the filtering action to produce signal FS after the filtering.
Signal FS after the filtering is implemented one quantize action to produce a quantized signal QS.
One single tunable integers word/analog converter is provided, and this single position tunable integers word/analog converter has an adjustable configuration, in order to according to quantized signal with and configuration produce a feedback signal FES.
Add up an input signal IS and feedback signal FES and add resultant signal SS with generation.
If the method is corresponding to embodiment shown in Figure 3, then step 605 more comprises: provide a resistance, one first voltage, a common voltage and one second voltage with the some as this single position tunable integers word/analog converter; According to quantized signal QS output common voltage, first voltage, second voltage one of them to resistance; And utilize resistance, first voltage, common voltage and second voltage to produce feedback signal FES; Wherein, resistance, first voltage, common voltage and second voltage wherein at least one be adjustable.
If the method is corresponding to embodiment shown in Figure 4, then step 605 more comprises: an electric capacity, a common voltage and one first a voltage (V are provided
1Or V
2) with the some as single position tunable integers word/analog converter; And utilize electric capacity, common voltage and the first voltage (V
1Or V
2) produce feedback signal FES according to quantized signal QS; And electric capacity, the common voltage and the first voltage (V
1Or V
2) wherein one is adjustable at least.
If the method is corresponding to embodiment shown in Figure 5, then step 605 more comprises: an adjustable current source (I is provided
1Or I
2) as the some of single position tunable integers word/analog converter; And utilize adjustable current source to produce feedback signal FES according to quantized signal QS.
By above-mentioned structure and method, visual demand is adjusted the structure of digital/analog converter, and such mechanism has following benefit: the dynamic range of having expanded the input signal of triangular integration modulator; Switch not position can be avoided distorted signals on signal path; Because of only there are two kinds of probable values single position, and 2 must constitute a straight line, therefore use the digital/analog converter of single position can omit the enhancing linearity algorithm of long number/analog converter institute palpus and required hardware thereof, and avoided the not enough problem of the contingent linearity; This type of triangular integration modulator also can be used as automatic gain control, and (Auto Gain Control AGC) uses; The digital/analog converter of single position can be the structure of continuous signal or is the structure of discontinuous signal, has increased the utilization of circuit.If quantifying unit is coupled to sampling filter, such mechanism can be kept bit stream output (bits tream output), helps to simplify the design of sampling filter.
Fig. 7 shows the comparison diagram according to the triangular integration modulator of triangular integration modulator of the present invention and prior art, can more understand advantage according to triangular integration modulator of the present invention by this diagram.At the hypothesis quantizer is desirable, and does not consider under the situation of quantizing noise: the relation of output signal Y and input signal X can be represented by beneath identity:
If H β is much larger than 1, then the relation of output signal Y and input signal X can be considered
Therefore if desire to make the value of Y bigger, then can adjust the value of X or β.In the existing practice, be the value of adjusting X, yet this type of adjustment mechanism be positioned on the signal path, therefore can influence the linearity of signal.And the present invention is a value of adjusting β, and its adjustment mechanism is not positioned on the signal path, therefore has the advantage that can not influence the linearity of signal.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (13)
1. triangular integration modulator comprises:
One loop filter is implemented the filtering action to produce signal after the filtering in order to add resultant signal to one;
One single quantizer is coupled to this loop filter, quantizes action to produce a quantized signal in order to signal after this filtering is implemented one;
One single tunable integers word/analog converter, be coupled to this single position quantizer, this single position tunable integers word/analog converter has an adjustable configuration, and this single position tunable integers word/analog converter is in order to produce a feedback signal according to this quantized signal and this configuration; And
One adder is coupled to this loop filter and this single position tunable integers word/analog converter, adds resultant signal in order to add up an input signal and this feedback signal to produce this.
2. triangular integration modulator as claimed in claim 1, wherein, this single position tunable integers word/analog converter comprises one first configuration initialization circuit, and this first configuration initialization circuit comprises:
One resistance;
One first switch is coupled to this resistance;
One second switch is coupled to this first switch and one first voltage;
One the 3rd switch is coupled to this first switch and a common voltage; And
One the 4th switch is coupled to this resistance and one second voltage;
Wherein, the action of this first switch, this second switch, the 3rd switch and the 4th switch is to move according to this quantized signal, and this resistance, this first voltage, this common voltage and this second voltage wherein at least one be adjustable.
3. triangular integration modulator as claimed in claim 2, wherein, this feedback signal of this single position tunable integers word/analog converter is to be exported by two differential output ends, and this single position tunable integers word/analog converter comprises one second configuration initialization circuit, this first configuration initialization circuit and this second configuration initialization circuit are coupled to this two differential output end respectively, and this first configuration initialization circuit and this second configuration initialization circuit have components identical and structure.
4. triangular integration modulator as claimed in claim 1, wherein, this single position tunable integers word/analog converter comprises one first configuration initialization circuit, and this first configuration initialization circuit comprises:
One outgoing route is coupled to this adder;
One electric capacity;
One first switch is coupled to this outgoing route and this electric capacity;
One second switch is coupled to common voltage and this electric capacity; And
One the 3rd switch is coupled to this electric capacity and one first voltage;
Wherein, the action of this first switch, this second switch and the 3rd switch is to move according to this quantized signal, and this electric capacity, this common voltage and this first voltage wherein at least one be adjustable.
5. triangular integration modulator as claimed in claim 4, wherein, this feedback signal of this single position tunable integers word/analog converter is to be exported by two differential output ends, and this single position tunable integers word/analog converter comprises one second configuration initialization circuit, this first configuration initialization circuit and this second configuration initialization circuit are coupled to this two differential output end respectively, and this first configuration initialization circuit and this second configuration initialization circuit have components identical and structure.
6. triangular integration modulator as claimed in claim 5, wherein, the 3rd switch of this second configuration initialization circuit couples this electric capacity to one second voltage of this second configuration initialization circuit, and this first magnitude of voltage and this second magnitude of voltage are different.
7. triangular integration modulator as claimed in claim 1, wherein, this single position tunable integers word/analog converter comprises one first configuration initialization circuit, and this first configuration initialization circuit comprises:
One outgoing route is coupled to this adder;
One adjustable current source; And
One switch is coupled to this adjustable current source and this outgoing route, moves according to this quantized signal.
8. triangular integration modulator as claimed in claim 7, wherein, this feedback signal of this single position tunable integers word/analog converter is exported by two differential output ends, and this single position tunable integers word/analog converter comprises one second configuration initialization circuit, this first configuration initialization circuit and this second configuration initialization circuit are coupled to this two differential output end respectively, and this first configuration initialization circuit and this second configuration initialization circuit have components identical and structure.
9. triangular integration modulator as claimed in claim 8, wherein, the adjustable current source of this of this second configuration initialization circuit has different current values with this adjustable current source of this first configuration initialization circuit.
10. signal modulating method comprises:
(a) add resultant signal to one and implement the filtering action to produce signal after the filtering;
(b) signal after this filtering is implemented one and quantize action to produce a quantized signal;
(c) provide one single tunable integers word/analog converter, this single position tunable integers word/analog converter has an adjustable configuration, in order to produce a feedback signal according to this quantized signal and this configuration; And
(d) add up an input signal and this feedback signal and add resultant signal to produce this.
11. signal modulating method as claimed in claim 10 wherein, should (c) step comprise:
Provide a resistance, one first voltage, a common voltage and one second voltage with some as this single position tunable integers word/analog converter;
According to this quantized signal export this common voltage, this first voltage, this second voltage one of them to this resistance; And
Utilize this resistance, this first voltage, this common voltage and this second voltage to produce this feedback signal;
Wherein, this resistance, this first voltage, this common voltage and this second voltage wherein at least one be adjustable.
12. signal modulating method as claimed in claim 10 wherein should (c) step comprise:
Provide an electric capacity, a common voltage and one first voltage with some as this single position tunable integers word/analog converter; And
Utilize this electric capacity, this common voltage and this first voltage and produce this feedback signal according to this quantized signal;
And this electric capacity, this common voltage and this first voltage wherein at least one be adjustable.
13. signal modulating method as claimed in claim 10 wherein should (c) step comprise:
The part of one adjustable current source as this single position tunable integers word/analog converter is provided; And
Utilize this adjustable current source and produce this feedback signal according to this quantized signal.
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| CN102098056B (en) * | 2009-12-11 | 2013-10-30 | 财团法人工业技术研究院 | Trigonometric integral modulator and pulse width modulation tracking quantizer |
| CN103248366B (en) * | 2013-05-04 | 2016-01-13 | 徐州柏瑞高新技术科技有限公司 | A kind of Leakage-type difference accumulation analog digital modulation converter |
| US9831892B1 (en) * | 2016-07-12 | 2017-11-28 | Mediatek Inc. | Noise reduction circuit and associated delta-sigma modulator |
| CN110943742B (en) * | 2018-09-21 | 2023-03-24 | 瑞昱半导体股份有限公司 | Correction method and correction circuit for delta-sigma modulator |
| CN111106835B (en) * | 2018-10-25 | 2023-03-24 | 瑞昱半导体股份有限公司 | Correction method and correction circuit for delta-sigma modulator |
Citations (3)
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|---|---|---|---|---|
| WO2005002059A1 (en) * | 2003-06-27 | 2005-01-06 | Koninklijke Philips Electronics N.V. | An analog-to-digital-converter comprising a sigma-delta-modulator and receiver with such analog-to-digital-converter |
| EP1116332B1 (en) * | 1999-07-28 | 2006-01-25 | Koninklijke Philips Electronics N.V. | Variable order sigma - delta modulator |
| CN101005286A (en) * | 2005-10-21 | 2007-07-25 | 瑞昱半导体股份有限公司 | Low-pass filter based delta-sigma modulator |
-
2007
- 2007-08-10 CN CN2007101409400A patent/CN101364807B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1116332B1 (en) * | 1999-07-28 | 2006-01-25 | Koninklijke Philips Electronics N.V. | Variable order sigma - delta modulator |
| WO2005002059A1 (en) * | 2003-06-27 | 2005-01-06 | Koninklijke Philips Electronics N.V. | An analog-to-digital-converter comprising a sigma-delta-modulator and receiver with such analog-to-digital-converter |
| CN101005286A (en) * | 2005-10-21 | 2007-07-25 | 瑞昱半导体股份有限公司 | Low-pass filter based delta-sigma modulator |
Non-Patent Citations (1)
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| WO 2005002059 A1,全文. |
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