CN101267413B - RF transmission method and system and vibration wave generator, sigma-delta modulator and mobile terminal - Google Patents
RF transmission method and system and vibration wave generator, sigma-delta modulator and mobile terminal Download PDFInfo
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- CN101267413B CN101267413B CN200810086197XA CN200810086197A CN101267413B CN 101267413 B CN101267413 B CN 101267413B CN 200810086197X A CN200810086197X A CN 200810086197XA CN 200810086197 A CN200810086197 A CN 200810086197A CN 101267413 B CN101267413 B CN 101267413B
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Abstract
The invention discloses a RF(radio frequency) transmitting method appropriate for a RF transmitting system including a data coded combination, a filter, a sigma-delta modulator and a RF transmitter, comprising a step of transmitting data outwards by the RF transmitter through an antenna, further comprising: when starting the RF transmitter, obtaining an oscillation wave with a power average as 0 by trigger; sending the oscillation wave as output of the sigma-delta modulator to the RF transmitter; when starting the sigma-delta modulator, stopping generation of the oscillation wave; transferring RF data of the sigma-delta modulator to the RF transmitter. The invention also discloses a RF transmitting system, a mobile terminal based on the RF transmitting system, an oscillation wave builder, and a sigma-delta modulator. The invention is capable of overcoming modulation peak caused by sigma-delta modulation/demodulation, which is easy to accomplish.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of RF transmission method, a kind of radio-frequency (RF) emission system and the portable terminal that adopts this radio-frequency (RF) emission system, and a kind of concussion waveform maker and a kind of sigma-delta modulator (Sigma-Delta modulator).
Background technology
The performance of mobile communication system depends on the performance of portable terminal to a great extent, such as, 3-G (Generation Three mobile communication system) TD-SCDMA (the TimeDivision-Synchronous Code Division Multiple Access that has independent intellectual property right for China, TD SDMA inserts), the current situation of its TD-SCDMA terminal is exactly the bottleneck place of system's commercialization.
And for portable terminal, its radio frequency (RF) transmitting-receiving performance is the important ring in the design.Specifically, the core of portable terminal comprises radio frequency chip and baseband chip: this radio frequency chip also can be called as transceiver (Transceiver), is connected with antenna, responsible radio frequency receipts/send out, A/D and D/A conversion, frequency synthesis, power amplification etc.; This baseband chip also can be called as modulator-demodulator (Modem), is connected with radio frequency chip by interface, is responsible for signal processing and protocol processes.At present, a lot of portable terminals adopt ∑-Δ modulating/demodulating mode, with under the condition of same resolution, reach than general modulating/demodulating mode more performance.
This ∑-Δ modulating/demodulating mode is a kind of over-sampling A/D and the D/A switch technology of Inose in invention in 1962, as shown in Figure 1, the radio frequency chip and the baseband chip that have shown a portable terminal, and this portable terminal has adopted ∑-Δ modulating/demodulating mode, specific as follows: as to replace traditional analog interface, radio frequency interface by numeral between its radio frequency chip and the baseband chip connects, this digital RF interface adopts LVDS (Low Voltage Differential Signaling, Low Voltage Differential Signal) technology mode; Radio frequency chip comprises radiofrequency launcher (Transmitter) and radio frequency receiver (Receiver), carries out digital data transfer by TxI, TxQ and RxI, RxQ end with baseband chip respectively; Baseband chip comprises ∑-Δ modulator/demodulator and radio frequency interface, this radio frequency interface comprises GPO (the General PurposeOutput that is used for the general control of radio frequency, general output) or GPIO (General Purpose In/Output, general I/O) end, and SPI (Serial PeripheralInterface, the Serial Peripheral Interface (SPI)) end that is used for writing control word to the register of radio frequency chip inside.
Please further referring to Fig. 2, shown the example of radio frequency transmitting system, it has constituted the up transmission path of rf data.Wherein, radiofrequency launcher is positioned at radio frequency chip, comprises power amplifier, ∑-Δ D/A and upconverter, as shown in Figure 3; And the digital coding that connects successively combination, RRC Filter (root-raised cosine filter) and sigma-delta modulator are positioned at baseband chip.When this radio frequency transmitting system operate as normal, the data that will launch that radiofrequency launcher will receive through power amplifier, are exported by antenna end after D/A conversion and up-conversion.Here it is pointed out that radio frequency receiver also is positioned at radio frequency chip, comprise ∑-Δ A/D etc.,, therefore do not launch to describe with regard to it owing to do not relate to improvements of the present invention.
Generally speaking,, will carry out frequency locking to this radiofrequency launcher earlier, and enable the upconverter in the radiofrequency launcher before radiofrequency launcher sends rf data at sigma-delta modulator, promptly the ∑ of radiofrequency launcher-Δ D/A starts working in advance; Simultaneously, the power amplifier in the radiofrequency launcher is because the unsteadiness of self needs a period of time unlatching a little in advance, and to guarantee having time enough to enter stable state, promptly the power amplifier of radiofrequency launcher also needs to enter in advance operating state.And this moment, baseband chip still is in not operating state, and promptly the level on the LVDS line is in 0 or 1 state, and promptly under the situation that the ∑-Δ D/A and the power amplifier of radiofrequency launcher are started working in advance, what baseband chip was exported is constant LVDS data.
And according to ∑-Δ modulating/demodulating principle, the transmitting terminal of radio frequency chip need be provided with integrator, this will reach capacity after just having caused constant LVDS data to be handled through integrator moment, and send by in running order radiofrequency launcher, the front end that appears at useful rf data forms the modulation spike, as shown in Figure 4.
Obviously, adopt ∑-Δ modulating/demodulating mode can cause the modulation spike problem of up rf data.Therefore the power of this modulation spike will be higher than the power of rf data, can produce serious disturbance to the front radio-frequency data that reality sends, and causes the correctly up rf data that sends of mobile terminal receive of base station.
Summary of the invention
Embodiments of the invention aim to provide the corresponding techniques scheme, adopt existing modulation spike problem after ∑-Δ modulating/demodulating mode to overcome portable terminal.
For achieving the above object, embodiments of the invention provide a kind of RF transmission method, are applicable to the radio-frequency (RF) emission system that comprises digital coding combination, filter, sigma-delta modulator and radiofrequency launcher; This RF transmission method comprises that radiofrequency launcher passes through the step that antenna outwards sends data; Further comprising the steps of:
S1, when radiofrequency launcher starts, trigger to generate the power average and be 0 concussion waveform;
S2, with this concussion waveform as the output of sigma-delta modulator, send to radiofrequency launcher;
S3, when sigma-delta modulator starts, stop the generation of this concussion waveform;
S4, transmit the rf data of described sigma-delta modulator to this radiofrequency launcher.
Embodiments of the invention also provide a kind of radio-frequency (RF) emission system, comprise the digital coding combination, filter, sigma-delta modulator and the radiofrequency launcher that connect successively; Also comprise and be arranged on the concussion of one between this sigma-delta modulator and radiofrequency launcher waveform maker; Wherein, the startup of this radiofrequency launcher triggers this concussion waveform maker, and to make it generate power average be 0 concussion waveform and send to radiofrequency launcher; The startup of this sigma-delta modulator triggers this concussion waveform maker, makes its generation that stops the concussion waveform, and transmits the rf data of this sigma-delta modulator to this radiofrequency launcher.
Embodiments of the invention also provide a kind of concussion waveform maker, are arranged between the sigma-delta modulator and radiofrequency launcher of radio-frequency (RF) emission system; This concussion waveform maker is provided with:
Concussion waveform generation module is used to generate the power average and is 0 concussion waveform;
First Enable Pin is connected with this radiofrequency launcher by holding wire, is used for triggering according to the startup of this radiofrequency launcher, instructs this concussion waveform generation module to start;
Second Enable Pin is connected with this sigma-delta modulator by holding wire, is used for triggering according to the startup of this sigma-delta modulator, instructs this concussion waveform generation module to stop the generation of concussion waveform;
Input is used to receive the rf data that this sigma-delta modulator sends;
Output is connected with this concussion waveform generation module with input respectively, is used for the rf data that the concussion waveform that will generate or input receive and sends to this radiofrequency launcher.
Embodiments of the invention also provide a kind of sigma-delta modulator, are applied in the radio-frequency (RF) emission system; Comprise aforesaid concussion waveform maker, be used for by this concussion waveform maker to radiofrequency launcher output rf data or concussion waveform.
Embodiments of the invention also provide a kind of portable terminal, and its radio-frequency (RF) emission system is aforesaid radio-frequency (RF) emission system.
As shown from the above technical solution, embodiments of the invention increase the output function of concussion waveform by start back and sigma-delta modulator startup at radiofrequency launcher before, have following beneficial effect:
1, overcomes the modulation spike that the employing ∑-Δ modulating/demodulating mode is caused, thereby guaranteed the performance of up emission data;
2, be easy to realize.
With reference to the accompanying drawing description of a preferred embodiment, above-mentioned and other purpose of the present invention, feature and advantage will be more obvious by following.
Description of drawings
Fig. 1 is the radio frequency chip of a portable terminal in the prior art and the schematic diagram of baseband chip;
Fig. 2 is a structured flowchart of radio frequency transmitting system in the prior art;
Fig. 3 is the structured flowchart of radiofrequency launcher in the prior art;
Fig. 4 is in the prior art, the emission data time-domain diagram behind the employing sigma-delta modulator;
Fig. 5 is the flow chart of RF transmission method one embodiment provided by the present invention;
Fig. 6 is the flow chart of RF transmission method one specific embodiment provided by the present invention;
Fig. 7 is the block diagram of radio-frequency (RF) emission system one embodiment provided by the present invention;
Fig. 8 is the block diagram of another embodiment of radio-frequency (RF) emission system provided by the present invention;
Fig. 9 is the emission data time-domain diagram of Fig. 7 or radio-frequency (RF) emission system shown in Figure 8;
Figure 10 is the block diagram of concussion waveform maker one embodiment provided by the present invention;
Figure 11 is the block diagram of another embodiment of concussion waveform maker provided by the present invention;
Figure 12 is the circuit diagram of sigma-delta modulator one embodiment provided by the present invention.
Embodiment
To describe specific embodiments of the invention in detail below.Should be noted that the embodiments described herein only is used to illustrate, be not limited to the present invention.
At first, mandatory declaration is that because modulation spike problem only is present in the up transmission path of rf data, so embodiments of the invention are not described with regard to the descending reception path of rf data.
Please refer to Fig. 5, shown the embodiment flow chart of a kind of RF transmission method provided by the present invention.This RF transmission method is applicable to the radio-frequency (RF) emission system that comprises digital coding combination, filter, sigma-delta modulator and radiofrequency launcher, but, taked the operation of output concussion waveform between radiofrequency launcher and sigma-delta modulator startup in order to overcome modulation spike problem of the prior art.Concrete, may further comprise the steps:
S1, when radiofrequency launcher starts, trigger to generate the power average and be 0 concussion waveform;
Preferable, this generation power average is that the step of 0 concussion waveform comprises: generate 0,1 sequence.
S2, with this concussion waveform as the output of sigma-delta modulator, send to radiofrequency launcher, and outwards send by antenna by radiofrequency launcher;
S3, when sigma-delta modulator starts, stop the generation of this concussion waveform;
S4 transmits the rf data of this sigma-delta modulator to radiofrequency launcher, and is outwards sent by antenna by radiofrequency launcher.
As can be seen, by the RF transmission method that the foregoing description provided, can be according to different sequencing control, produce 0,1 sequence signal in the improper data transmission phase (radiofrequency launcher starts and sigma-delta modulator startup as yet), and the transmission of assurance rf data when normal data transmission device (radiofrequency launcher starts and sigma-delta modulator all starts), thereby avoid modulating spike, guarantee up correctness that transmits and reliability.
In the above-described embodiments, radiofrequency launcher is keeping receiving the transmission of data.Preferable, because the characteristics of time division duplex (TDD), sequential is controlled in the particularly TD-SCDMA terminal system control extremely important in terminal system.In order further to guarantee to modulate the inhibition of spike, the present invention also provides the sequencing control scheme of refinement, take into full account the reaction time of chip, the response time of rf data and the response time of enable signal, the reasonable scheduling of radio frequency reflector frequency locking time, concussion waveform output time, power amplifier is opened time and sigma-delta modulator start-up time, upconverter enable and the power amplifier of radiofrequency launcher start between output concussion waveform, to utilize ∑-Δ modulating characteristic, make the Sasser of output effectively overcome the modulation spike, thus make sigma-delta modulator can better application in portable terminal.
Further, can also open sequential in conjunction with antenna, make before the step S3, radiofrequency launcher does not carry out the output of radiofrequency signal.
Concrete, see also Fig. 6, the design of this sequential is particularly suitable for the up rf data structure of TD-SCDMA portable terminal, tentation data real launch time is a T (unit: 1/8chip, 1chip=781.25ns), n1＞n2＞n3＞n4＞n5＞n6＞n7, and the concussion waveform is then comprised the following steps: by the generation of concussion waveform maker
S11, T-n1 open radiofrequency launcher master switch pin, comprise the base band selection;
S12, T-n2 write radiofrequency launcher by SPI three buses and carry out frequency locking, and be concrete, is that frequency register to radiofrequency launcher carries out frequency locking and realizes;
S13, T-n3 open radiofrequency launcher upconverter switch pin, enable upconverter; As can be seen, this moment, ∑-Δ D/A started working;
S14, T-n4 open the radio frequency interface switch, enable to shake the waveform maker and generate the concussion waveform;
As the specific implementation of step S2, this concussion waveform is exported to radiofrequency launcher by LVDS (Low Voltage Differential Signal), and next carries out:
T-n5, concussion waveform maker is write the power amplifier register of radiofrequency launcher by SPI three buses, with the output corresponding power; As can be seen, give ∑-Δ D/A, attack rate amplifier, also can not export a modulating pulse that power is very high, but export a Sasser signal that power is very low even therefore open owing to exported the Sasser signal at step S14;
Next, be the specific implementation of step S3 and S4:
T-n6 opens baseband chip and sends out switch several, the n bits interface input sigma-delta modulator of rf data from Figure 12, and send radiofrequency launcher to by LVDS (Low Voltage Differential Signal) interface through concussion waveform maker;
T-n7, radiofrequency launcher is opened antenna.
As can be seen, before opening power amplifier, enable to shake waveform maker output oscillator signal earlier, the different situations that can adapt to single time slot of emission and multi-slot, effectively overcome sigma-delta modulator and the radio-frequency (RF) transmitter inconsistent modulation spike that causes start-up time, well improve the quality that transmits.
Accordingly, the embodiment of the invention also provides a kind of radio-frequency (RF) emission system 10, as shown in Figure 7, comprises the digital coding combination, filter, sigma-delta modulator and the radiofrequency launcher that connect successively; Also comprise the concussion waveform maker 100 that is arranged between described sigma-delta modulator and the radiofrequency launcher.
Wherein, the startup of this radiofrequency launcher triggers concussion waveform maker 100, and to make it generate power average be 0 concussion waveform and send to radiofrequency launcher; The startup of this sigma-delta modulator triggers concussion waveform maker 100, makes its generation that stops described concussion waveform, and transmits the rf data of sigma-delta modulator to radiofrequency launcher.Thereby, avoid between the startup of sigma-delta modulator and radiofrequency launcher, because the modulation spike that constant LVDS data are caused.
This concussion waveform maker can be 0/1 sequence generator.
In actual applications, this concussion waveform maker 100 can make up to be provided with sigma-delta modulator and constitute new sigma-delta modulator 200, and the radio-frequency (RF) emission system 10 of Gou Chenging as shown in Figure 8 thus.
Please in conjunction with Fig. 9, shown employing Fig. 7 or radio-frequency (RF) emission system shown in Figure 8 10 after, emission data time-domain diagram.As can be seen, the modulation spike is effectively overcome, and the quality that transmits obtains to improve.
Further, in conjunction with the above-mentioned radio-frequency (RF) emission system that provides 10, the embodiment of the invention also provides a kind of portable terminal, and its radio-frequency (RF) emission system is aforesaid radio-frequency (RF) emission system 10.
This portable terminal can be the TD-SCDMA portable terminal.
As the realization radio-frequency (RF) emission system that the embodiment of the invention provided and the critical component of RF transmission method, the present invention also provides the specific implementation of concussion waveform maker 100.
See also Figure 10, shown the block diagram of concussion waveform maker 100 1 embodiment provided by the present invention.
This concussion waveform maker 100 is arranged between the sigma-delta modulator and radiofrequency launcher of radio-frequency (RF) emission system.This concussion waveform maker 100 is provided with:
Concussion waveform generation module 101 is used to generate the power average and is 0 concussion waveform.In general, under ∑-Δ modulating/demodulating mode, can adopt 0/1 sequence generation module to realize, the concussion waveform of its generation is 0,1 sequence.
By the foregoing description as can be seen, concussion waveform maker 100 is to send concussion waveform or forwarding rf data, be based on that the current state of sigma-delta modulator and radiofrequency launcher determines: if radiofrequency launcher is opened, and sigma-delta modulator still is in not operating state, then send the concussion waveform by concussion waveform maker 100, because the power average of this concussion waveform is 0, therefore radiofrequency launcher can not carry out signal output or the very low signal of power output, thus the modulation spike of avoiding constant LVDS data to be caused; If radiofrequency launcher and sigma-delta modulator are all opened, then export normal rf data, outwards launch by antenna by in running order radiofrequency launcher.
Therefore,, can be implemented in different moment to produce different signal output, avoiding modulating the appearance of spike, thereby guarantee the performance of up emission data by the concussion waveform maker 100 that the embodiment of the invention provided.
Preferable, this first Enable Pin 102 is connected with radiofrequency launcher by a radio frequency interface default between radiofrequency launcher and the sigma-delta modulator, receive in this radiofrequency launcher on the startup triggering of frequency locking device.Simultaneously, technical scheme provided by the present invention is controlled by radio frequency interface, makes and goes up the startup of the startup of frequency locking device prior to the radiofrequency launcher intermediate power amplifier in the radiofrequency launcher.
Above-mentioned processing has added timing Design, further refinement the startup opportunity of concussion waveform maker 100, be that it is to enable and exported to shake waveform before the radio frequency interface of last frequency locking device correspondence enables back, power amplifier startup, to guarantee can not occur modulating spike.
Better, see also Figure 11, shown another embodiment of concussion waveform maker 100 provided by the present invention.
Present embodiment is on the basis of the foregoing description, second Enable Pin 103 of concussion waveform maker 100 is closed with its input 104 and is established, with the first frame rf data that receives as enable signal, instruction concussion waveform maker is ended the generation of concussion waveform, to simplify Design of Signal, avoid system complexity to increase.
In the PCB of reality design, oscillator waveform maker 100 often with the integrated design of sigma-delta modulator, promptly based on above-mentioned concussion waveform maker 100, embodiments of the invention also provide a kind of sigma-delta modulator 200, itself and radiofrequency launcher connect and compose radio-frequency (RF) emission system 10, and comprise aforesaid concussion waveform maker 100, be used for by this concussion waveform maker 100 to radiofrequency launcher output rf data or concussion waveform, avoiding modulating the generation of spike, thus can better application in the TD-SCDMA portable terminal.
Concrete, see also Figure 12, shown the structural representation of this sigma-delta modulator 200, be example with three rank in the present embodiment.
Preferable, because sigma-delta modulator 200 is the loop of a band feedback at numerical portion, so whether it can be provided with a starting switch (not shown) and accurately control this sigma-delta modulator 200 and work, thereby be used on the one hand guaranteeing the stable of sigma-delta modulator 200 work, realization is shaken hands with upper level module (raised cosine roll off filter); Be used for the power saving of sigma-delta modulator 200 on the other hand.
Though described the present invention with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from invention because the present invention can specifically implement in a variety of forms, so be to be understood that, the foregoing description is not limited to any aforesaid details, and should be in the spirit and scope that claim limited of enclosing explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (14)
1. a RF transmission method is applicable to the radio-frequency (RF) emission system that comprises digital coding combination, filter, sigma-delta modulator and radiofrequency launcher; Described RF transmission method comprises that radiofrequency launcher passes through the step that antenna outwards sends data; It is characterized in that, further comprising the steps of:
S1, enable and between power amplifier starts in the upconverter of radiofrequency launcher, triggering and generating the power average is 0 concussion waveform;
S2, with of the output of described concussion waveform as sigma-delta modulator, send to radiofrequency launcher;
S3, when sigma-delta modulator starts, stop the generation of described concussion waveform;
S4, transmit the rf data of described sigma-delta modulator to described radiofrequency launcher.
2. RF transmission method according to claim 1 is characterized in that, described step S1 specifically comprises:
Start the radiofrequency launcher master switch;
By SPI three buses described radiofrequency launcher is carried out frequency locking;
Start the upconverter of described radiofrequency launcher;
Enable a default radio frequency interface and generate the concussion waveform to trigger described concussion waveform maker;
Comprise after the described step S2:
Power amplifier by the described radiofrequency launcher of SPI three bus startings.
3. RF transmission method according to claim 2 is characterized in that, also comprises after the described step S3: the antenna that starts radiofrequency launcher.
4. according to the arbitrary described RF transmission method of claim 1-3, it is characterized in that the step that generates the power average among the described step S 1 and be 0 concussion waveform comprises: generate 0,1 sequence.
5. a radio-frequency (RF) emission system comprises the digital coding combination, filter, sigma-delta modulator and the radiofrequency launcher that connect successively; It is characterized in that, also comprise being arranged on the concussion of one between described sigma-delta modulator and radiofrequency launcher waveform maker; Wherein, enable and between power amplifier started, the startup of described radiofrequency launcher triggered described concussion waveform maker in the upconverter of described radiofrequency launcher, to make it generate power average be 0 concussion waveform and send to radiofrequency launcher; The startup of described sigma-delta modulator triggers described concussion waveform maker, makes its generation that stops described concussion waveform, and transmits the rf data of described sigma-delta modulator to described radiofrequency launcher.
6. radio-frequency (RF) emission system according to claim 5 is characterized in that, described concussion waveform maker and the combination of described sigma-delta modulator are provided with.
7. according to claim 5 or 6 described radio-frequency (RF) emission system, it is characterized in that described concussion waveform maker is 0/1 sequence generator.
8. a concussion waveform maker is arranged between the sigma-delta modulator and radiofrequency launcher of radio-frequency (RF) emission system; It is characterized in that described concussion waveform maker is provided with:
Concussion waveform generation module is used to generate the power average and is 0 concussion waveform;
First Enable Pin is connected with described radiofrequency launcher by holding wire, is used for that upconverter at described radiofrequency launcher enables and between power amplifier starts, and triggers according to the startup of described radiofrequency launcher, instructs described concussion waveform generation module to start;
Second Enable Pin is connected with described sigma-delta modulator by holding wire, is used for triggering according to the startup of described sigma-delta modulator, instructs described concussion waveform generation module to stop the generation of described concussion waveform;
Input is used to receive the rf data that described sigma-delta modulator sends;
Output is connected with described concussion waveform generation module with input respectively, is used for the rf data that the concussion waveform that will generate or input receive and sends to described radiofrequency launcher.
9. concussion waveform maker according to claim 8, it is characterized in that, described first Enable Pin is connected with described radiofrequency launcher by a radio frequency interface default between radiofrequency launcher and the sigma-delta modulator, receive in the described radiofrequency launcher on the startup triggering of frequency locking device; Wherein, go up the startup of the startup of frequency locking device in the described radiofrequency launcher prior to described radiofrequency launcher intermediate power amplifier.
10. concussion waveform maker according to claim 8 is characterized in that, second Enable Pin and described input close to be established, and as enable signal, instructs described concussion waveform generation module to end the generation of concussion waveform with the first frame rf data that receives.
11. arbitrary according to Claim 8-10 described oscillator waveform maker is characterized in that described concussion waveform generation module is one 0/1 sequence generation modules.
12. a sigma-delta modulator is applied in the radio-frequency (RF) emission system; It is characterized in that, comprise arbitrary described concussion waveform maker, be used for by described concussion waveform maker to radiofrequency launcher output rf data or concussion waveform as claim 8-11.
13. sigma-delta modulator according to claim 12 is characterized in that, also comprises starting switch, is used to control the startup of described sigma-delta modulator.
14. a portable terminal is characterized in that, its radio-frequency (RF) emission system is as the arbitrary described radio-frequency (RF) emission system of claim 5-7.
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| CN104571480A (en) * | 2013-10-21 | 2015-04-29 | 英业达科技有限公司 | Muting control system |
| US9281976B2 (en) * | 2014-02-04 | 2016-03-08 | Texas Instruments Incorporated | Transmitter and method of transmitting |
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| CN1360759A (en) * | 1999-07-09 | 2002-07-24 | 特利泰尔R&D丹麦有限公司 | Sigma-Delta modulator |
| CN1547804A (en) * | 2000-07-07 | 2004-11-17 | �ʼҷ����ֵ�������˾ | Sigma-delta modulator with an adjustable feedback factor |
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| CN1360759A (en) * | 1999-07-09 | 2002-07-24 | 特利泰尔R&D丹麦有限公司 | Sigma-Delta modulator |
| CN1547804A (en) * | 2000-07-07 | 2004-11-17 | �ʼҷ����ֵ�������˾ | Sigma-delta modulator with an adjustable feedback factor |
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