CN1838525A - Modulator - Google Patents
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- CN1838525A CN1838525A CN 200610075270 CN200610075270A CN1838525A CN 1838525 A CN1838525 A CN 1838525A CN 200610075270 CN200610075270 CN 200610075270 CN 200610075270 A CN200610075270 A CN 200610075270A CN 1838525 A CN1838525 A CN 1838525A
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Abstract
This invention provides a modulation device which is to modulate base frequency signal, which includes phase-splitter, low pass filter and adjustor. The phase-splitter produces a polarity of phase angles according to square wave signal, the phase angles are the first signals of 0degree,30degree,90degree, 120degree,180degree,210degree,270degreeand 300degreeseparately, the low pass filter is to filter the high frequency signal of the first signals to produce polarity of local oscillating signals whose phase angles are 0degree,30degree,90degree,120degree,180degree,210degree,270degreeand 300degreeseparately, the adjustor adjusts the base frequency signal according to the local oscillating signals to eliminate the third order harmonic of the local oscillating signal. Besides, this invention also provides an adjusting method for adjust base frequency signal.
Description
Technical field
The invention relates to a kind of modulating device, particularly relevant for a kind of modulating device that can suppress the harmonic wave of local oscillated signal and promote the modulation precision.
Background technology
In wireless telecommunication system, generally include modulator in the raising frequency of reflector (up-conversion) framework.This modulator converts fundamental frequency signal to intermediate frequency (IF) signal according to local oscillated signal.Three kinds of main specifications judging the modulator quality are that other ripple suppresses (sideband suppression), carrier suppressed (carrier suppression) and undesirable harmonic wave inhibition (undesired harmonicssuppression).Wherein, it is to leak (sideband leakage) about other ripple that other ripple suppresses, and stems from the phase place of modulation signal or the error of amplitude.Carrier suppressed is about carrier leak (carrierleakage), stems from the Dc bias of modulation signal.It is the undesirable harmonic wave that the mutual computing of signal is produced during about modulation that undesirable harmonic wave suppresses.Therefore, the modulation precision that how to promote modulator is important problem in the present wireless telecommunication system.
In the prior art, a kind of technology commonly used is the one group of choke-condenser filter of outside otherwise designed (LC filter) at modulator, to solve the problem of undesirable harmonic wave, so will increase the area and the cost of manufacture of overall circuit.Another kind of common technology is a mathematical characteristic of utilizing modulation operation, suppresses some particular harmonic and takes place.Consult Fig. 1, it is the modulating device 100 that shows that a kind of prior art is commonly used, comprises first polyphase filters (poly-phase filter), 102, second polyphase filters 104, two amplifiers (amplifier) 106 and 108, modulator (modulator) 110 and filter 130.At first, first polyphase filters 102 receives string ripple 112 and to four signals 114 that the phase angle is respectively 45 °, 135 °, 225 °, 315 ° of converting.Second polyphase filters 104 converts signal 114 to eight signals 116 and 118 that the phase angle is respectively 0 °, 30 °, 90 °, 120 °, 180 °, 210 °, 270 °, 300 °, wherein signal 116 contains four signals that the phase angle is respectively 30 °, 90 °, 210 °, 270 °, and signal 118 contains four signals that the phase angle is respectively 0 °, 120 °, 180 °, 300 °.Afterwards, two amplifiers 106,108 are in order to amplify above-mentioned eight signals 116 and 118 and produce signal 120 and 122, and signal 120 and 122 is the local oscillated signal of modulator 110.Then, modulator 110 is modulated according to the same-phase signal I and the quadrature phase signal Q of local oscillated signal 120 and 122 pairs of fundamental frequency signals, utilizes the mathematical characteristic of modulation operation to eliminate the 3rd order harmonics in the local oscillated signal 120 and 122.Filter 130 is in order to the harmonic wave of higher-order in elimination modulator output signal 124 and 126.
In the modulating device 100 that prior art shown in Figure 1 is used always, first polyphase filters 102 can only receive string ripple 112, and does not have the function of frequency reducing, therefore must use another group circuit to reduce frequency.In addition, control local oscillated signal amplitude the time will produce high current consumption.Also have, must external filters 130 to leach the harmonic wave that produces in the modulating device 100, so will increase the area and the cost of manufacture of overall circuit, power consumption is increase relatively also.
Therefore, the present invention proposes a kind of modulating device that can reduce power consumption, reduce cost of manufacture and lifting modulation precision.
Summary of the invention
In view of this, the invention provides a kind of modulating device that can suppress the harmonic wave (harmonicrejection) of local oscillated signal and promote the modulation precision, wherein this modulating device comprises phase splitter, low pass filter and modulator.Phase splitter according to square-wave input signal with produce a plurality of phase angles be respectively 0 °, 30 °, 90 °, 120 °, 180 °, 210 °, 270 ° with 300 ° first signal, low pass filter in order to the high-frequency signal of these first signals of filtering with produce a plurality of phase angles be respectively 0 °, 30 °, 90 °, 120 °, 180 °, 210 °, 270 ° with 300 ° local oscillated signal, modulator is then modulated this fundamental frequency signal to eliminate the 3rd order harmonics of these local oscillated signals according to these local oscillated signals.
In addition, the present invention more provides a kind of modulator approach in order to modulate base frequency signal, may further comprise the steps.At first, according to input signal produce a plurality of phase angles be respectively 0 °, 30 °, 90 °, 120 °, 180 °, 210 °, 270 ° with 300 ° first signal.Then, the high-frequency signal of these first signals of filtering and produce a plurality of phase angles be respectively 0 °, 30 °, 90 °, 120 °, 180 °, 210 °, 270 ° with 300 ° local oscillated signal.At last, according to these local oscillated signals, modulate this fundamental frequency signal to eliminate the 3rd order harmonics of these local oscillated signals.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, some preferred embodiments cited below particularly, and cooperate appended diagram, be described in detail below.
Description of drawings
Fig. 1 shows the modulating device that a kind of prior art is commonly used.
Fig. 2 shows the embodiment of modulating device proposed by the invention.
Fig. 3 shows another embodiment of modulating device proposed by the invention.
Fig. 4 shows the Mathematical Modeling of a modulator based on the local oscillated signal modulate base frequency signal.
[main element label declaration]
100,200,300～modulating device; 102～the first polyphase filters;
104～the second polyphase filters; 106,108～amplifier;
110～modulator;
112,114,116,118,120,122,124,126～holding wire;
130～filter;
204,304～N times of frequency eliminator;
206,308,310～three times of frequency eliminators;
208,210,306～twice frequency eliminator;
212,312～low pass filter; 214,314～modulator;
216,316～first value module; 218,318～phase splitter;
222,322～signal; 224～output signal;
226～phase angle is 120 °, 300 ° a secondary signal;
228～phase angle is 0 °, 180 ° a secondary signal;
230～phase angle is 30 °, 120 °, 210 °, 300 ° first signal;
232～phase angle is 0 °, 90 °, 180 °, 270 ° first signal;
234～phase angle is 30 °, 90 °, 210 °, 270 ° a local oscillated signal;
236～phase angle is 0 °, 120 °, 180 °, 300 ° a local oscillated signal;
238,338～control signal; 240,340～first value signal;
326～phase angle is 90 °, 270 ° a secondary signal;
328～phase angle is 0 °, 180 ° a secondary signal;
330～phase angle is 30 °, 90 °, 210 °, 270 ° first signal;
332～phase angle is 0 °, 120 °, 180 °, 300 ° first signal;
334～phase angle is 30 °, 90 °, 210 °, 270 ° a local oscillated signal;
336～phase angle is 0 °, 120 °, 180 °, 300 ° a local oscillated signal;
402,404,406,408,410,412,414,416～local oscillated signal;
422～the first modulation signals; 424～the second modulation signals;
The same-phase signal of I～fundamental frequency signal;
The quadrature phase signal of Q～fundamental frequency signal.
Embodiment
Fig. 2 is one embodiment of the invention, in order to explanation modulating device 200.Modulating device 200 comprises N times of frequency eliminator 204, first value module 216, phase splitter 218, low pass filter 212 and modulator 214.Wherein, N times of frequency eliminator 204 converts signal 222 to square wave that the work period is 50-50, that is output signal 224 is to phase splitter 218.Phase splitter 218 comprises three times of frequency eliminators 206, twice frequency eliminator 208 and 210 again, and wherein these frequency eliminators can use D flip-flop (D-flip-flop) to realize.Three times of frequency eliminators 206 produce and have four secondary signals at out of phase angle, and wherein the phase angle of the secondary signal on the holding wire 226 is 120 °, 300 °, and the phase angle of the secondary signal on the holding wire 228 is 0 °, 180 °.Twice frequency eliminator 208 receiving phase angles are 120 °, 300 ° secondary signal, and the generation phase angle is 30 °, 120 °, 210 °, 300 ° four first signals 230, and twice frequency eliminator 210 receiving phase angles are 0 °, 180 ° secondary signal, and the generation phase angle is 0 °, 90 °, 180 °, 270 ° four first signals 232.Low pass filter 212 receiving phase angles are 30 °, 120 °, 210 °, 300 °, 0 °, 90 °, 180 °, 270 ° first signal 230 and 232 and with the HFS filtering of these first signals, produce four local oscillated signals 234 and four local oscillated signals 236, and with above-mentioned local oscillated signal 234 and 236 input modulators 214.Wherein, the phase angle of four local oscillated signals 234 is 30 °, 90 °, 210 °, 270 °, and the phase angle of four local oscillated signals 236 is 0 °, 120 °, 180 °, 300 °.Then, modulator 214 is modulated according to the same-phase signal I and the quadrature phase signal Q of local oscillated signal 234 and 236 pairs of fundamental frequency signals, utilizes the mathematical characteristic of modulation operation to eliminate the 3rd order harmonics in the local oscillated signal 234 and 236.
In addition, the first value module 216 of the present invention's proposition can be exported control signal 238 earlier and enter phase splitter 218 to N times of frequency eliminator 204 to suspend this output signal 224 before modulating device 200 is started working.Then, first value module 216 is exported first value signal 240 again with three times of frequency eliminators 206, twice frequency eliminator 208 and 210 values just.By the time three times of frequency eliminators 206, twice frequency eliminators 208 and after 210 synchronoused working, first value module 216 was sent control signal 238 to trigger N times of frequency eliminator 204 again with these output signal 224 input phase splitters 218.
According to the embodiment of Fig. 2, can find that modulating device 200 provided by the present invention has several significant advantages, comprising: can accurately adjust the square wave amplitude of output signal 224, while eight local oscillated signals 234 and 236 have accurate phase angle; The high-order harmonic wave of the square wave on these first signals 230 and 232 of low pass filter 212 filterings, and modulator 214 utilizes eight local oscillated signals 234 of mathematical characteristic filtering of modulated process and 236 the 3rd order harmonics, therefore the output at modulator 214 does not need external filters, can reduce manufacturing cost and energy consumption.In addition, present embodiment all has significant improvement on other ripple inhibition, carrier suppressed and undesirable harmonic wave suppress.
Another embodiment of the invention as shown in Figure 3.The difference of the execution mode of Fig. 3 and Fig. 2 is the structure of phase splitter 318.Modulating device 300 comprises N times of frequency eliminator 304, first value module 316, phase splitter 318, low pass filter 312 and modulator 314.Wherein, to convert signal 322 to the work period be that the output signal 324 of 50-50 is to phase splitter 318 for N times of frequency eliminator 304.Phase splitter 318 comprises twice frequency eliminator 306, three times of frequency eliminators 308 and 310 again, and wherein these frequency eliminators can use D flip-flop to realize.Twice frequency eliminator 306 produces has four secondary signals at out of phase angle, and wherein the phase angle of the secondary signal on the holding wire 326 is 90 °, 270 °, and the phase angle of the secondary signal on the holding wire 328 is 0 °, 180 °.Three times of frequency eliminator 308 receiving phase angles are 90 °, 270 ° secondary signal, and the generation phase angle is 30 °, 90 °, 210 °, 270 ° four first signals 330, and three times of frequency eliminator 310 receiving phase angles are 0 °, 180 ° secondary signal, are 0 °, 120 °, 180 °, 300 ° four first signals 332 and produce the phase angle.Low pass filter 312 receiving phase angles are 30 °, 90 °, 210 °, 270 °, 0 °, 120 °, 180 °, 300 ° first signal 330 and 332 and with the HFS filtering of these first signals, produce four local oscillated signals 334 and four local oscillated signals 336, and with above-mentioned local oscillated signal 334 and 336 input modulators 314.Wherein, the phase angle of four local oscillated signals 234 also is 30 °, 90 °, 210 °, 270 °, and the phase angle of four local oscillated signals 236 also is 0 °, 120 °, 180 °, 300 °.Then, modulator 314 is modulated according to the same-phase signal I and the quadrature phase signal Q of local oscillated signal 334 and 336 pairs of fundamental frequency signals, utilizes the mathematical characteristic of modulation operation to eliminate the 3rd order harmonics in the local oscillated signal 334 and 336.Wherein modulator 314 is identical with modulator 214 among Fig. 2.
In addition, the first value module 316 of the present invention's proposition can be exported control signal 338 earlier and enter phase splitter 318 to N times of frequency eliminator 304 to suspend this output signal 324 before modulating device 300 is started working.Then, first value module 316 export again just value signal 340 with twice frequency eliminator 306, three times of frequency eliminators 308 and 310 at the beginning of values.By the time twice frequency eliminator 306, three times of frequency eliminators 308 and after 310 synchronoused working, first value module 316 was sent control signal 338 to trigger N times of frequency eliminator 304 again with these output signal 324 input phase splitters 318.
Fig. 4 shows the Mathematical Modeling of modulator 214 according to the same-phase signal I and the quadrature phase signal Q of local oscillated signal 234 and 236 modulate base frequency signal, and the mathematical characteristic of utilizing modulation operation is to eliminate the 3rd order harmonics in the local oscillated signal 234 and 236.In Fig. 4, the phase angle is 210 °, 270 °, 30 °, 90 ° a local oscillated signal 234 in local oscillated signal 402,404,410,412 composition diagrams 2, and the phase angle is 300 °, 0 °, 120 °, 180 ° a local oscillated signal 236 in local oscillated signal 406,408,414,416 composition diagrams 2.For instance, when the same-phase signal I of fundamental frequency signal be cos (w
BbT), quadrature phase signal Q is sin (w
BbT) time, above-mentioned local oscillated signal 402,404,406,408,410,412,414, be respectively cos (w with 416 value
LoT-150)+cos (3w
LoT-450)/3, cos (w
LoT-90)+cos (3w
LoT-270)/3, cos (w
LoT-60)+cos (3w
LoT-180)/3, cos (w
LoT)+cos (3w
LoT)/3, cos (w
LoT+30)+cos (3w
LoT+90)/3, cos (w
LoT+90)+cos (3w
LoT+270)/3, cos (w
LoT+120)+cos (3w
LoT+360)/3, cos (w
LoT-180)+cos (3w
LoT-540)/3.After simplifying, above-mentioned local oscillated signal 402,404,406,408,410,412,414, be respectively sin (w with 416 value
LoT-60)+cos (3w
LoT)/3, sin (w
LoT)-sin (3w
LoT)/3, cos (w
LoT-60)-cos (3w
LoT)/3, cos (w
LoT)+cos (3w
LoT)/3, cos (w
LoT+30)-sin (3w
LoT)/3, sin (w
LoT)+sin (3w
LoT)/3 ,-sin (w
LoT+30)+cos (3w
LoT)/3 ,-cos (w
LoT)-cos (3w
LoT)/3.After the modulation operation according to the same-phase signal I of local oscillated signal 402,404,406,408 and modulate base frequency signal and quadrature phase signal Q, then can obtain first modulation signal 422 and be cos (w
BbT) [sin (w
LoT-60)+sin (w
LoT)]+sin (w
BbT) [cos (w
LoT)+cos (w
LoT-60)].After the modulation operation according to the same-phase signal I of local oscillated signal 410,412,414,416 and modulate base frequency signal and quadrature phase signal Q, then can obtain second modulation signal 424 and be cos (w
BbT) [cos (w
LoT+30)-sin (w
LoT)]+sin (w
BbT) [sin (w
LoT+30)-cos (w
LoT)].Observe first modulation signal 422 and 424 discoveries of second modulation signal, modulator 214 is according to the same-phase signal I and the quadrature phase signal Q of local oscillated signal 234 and 236 modulate base frequency signal, really the 3rd order harmonics that does not comprise above-mentioned local oscillated signal, that is 3w
LoThe composition of t.
Therefore, as long as phase splitter 218 (shown in Figure 2) or 318 (shown in Figure 3) produce two groups of sources (source) with local oscillated signal of particular phase angle, final modulator 214 (shown in Figure 2) or 314 (shown in Figure 3) can successfully be eliminated the 3rd order harmonics in these local oscillated signals after can having the modulation operation of the same-phase signal I of the local oscillated signal of particular phase angle and modulate base frequency signal and quadrature phase signal Q according to these.
In sum, modulating device provided by the present invention has significant advantage and meets the patented invention important document.Only the above person is preferred embodiment of the present invention, is not to be used for limiting scope of the invention process.Be that all equalizations of being done according to claim scope of the present invention change and modification, be all claim scope of the present invention and contain.
Claims (10)
1. modulating device in order to modulate base frequency signal comprises:
Phase splitter, according to input signal produce a plurality of phase angles be respectively 0 °, 30 °, 90 °, 120 °, 180 °, 210 °, 270 ° with 300 ° first signal;
Low pass filter, in order to the high-frequency signal of these first signals of filtering, produce a plurality of phase angles be respectively 0 °, 30 °, 90 °, 120 °, 180 °, 210 °, 270 ° with 300 ° local oscillated signal; And
Modulator according to these local oscillated signals, is modulated this fundamental frequency signal to eliminate the 3rd order harmonics of these local oscillated signals;
Wherein this phase splitter comprises a plurality of frequency eliminators.
2. modulating device according to claim 1 also comprises:
Just the value module in order to these frequency eliminators of first value, makes these frequency eliminators synchronous.
3. modulating device according to claim 2, wherein above-mentioned value module just can be imported this phase splitter with this input signal by first time-out before this modulating device begins to operate, set the initial value of these frequency eliminators then, after these frequency eliminator synchronous workings, again this input signal is imported this phase splitter again.
4. modulating device according to claim 1, wherein the performed operation of said modulator comprises:
According to the phase angle is these local oscillated signals of 0 °, 210 °, 270 °, 300 °, the same-phase signal of this fundamental frequency signal and the quadrature phase signal of this fundamental frequency signal, produces first modulation signal; And
According to the phase angle is these local oscillated signals of 30 °, 90 °, 120 °, 180 °, this same-phase signal of this fundamental frequency signal and this quadrature phase signal of this fundamental frequency signal, produces second modulation signal;
Wherein, this first modulation signal and this second modulation signal do not comprise the 3rd order harmonics of these local oscillated signals.
5. modulating device according to claim 1, wherein this phase splitter comprises:
Three times of frequency eliminators produce a plurality of secondary signals according to this input signal, the phase angle of these secondary signals be respectively 0 °, 120 °, 180 °, with 300 °;
One first twice frequency eliminator is these secondary signals of 120 °, 300 ° according to the phase angle, produces the phase angle and be these first signals of 30 °, 120 °, 210 °, 300 °; And
One second twice frequency eliminator is these secondary signals of 0 °, 180 ° according to the phase angle, produces the phase angle and be these first signals of 0 °, 90 °, 180 °, 270 °.
6. modulating device according to claim 1, wherein this phase splitter comprises:
A twice frequency eliminator produces a plurality of secondary signals according to this input signal, the phase angle of these secondary signals be respectively 0 °, 90 °, 180 °, with 270 °;
One the 1 times of frequency eliminator is these secondary signals of 90 °, 270 ° according to the phase angle, produces the phase angle and be these first signals of 30 °, 90 °, 210 °, 270 °; And
One the 23 times of frequency eliminator is these secondary signals of 0 °, 180 ° according to the phase angle, produces the phase angle and be these first signals of 0 °, 120 °, 180 °, 300 °.
7. modulator approach in order to modulate base frequency signal comprises:
According to input signal produce a plurality of phase angles be respectively 0 °, 30 °, 90 °, 120 °, 180 °, 210 °, 270 ° with 300 ° first signal;
The high-frequency signal of these first signals of filtering and produce a plurality of phase angles be respectively 0 °, 30 °, 90 °, 120 °, 180 °, 210 °, 270 ° with 300 ° local oscillated signal; And
According to these local oscillated signals, modulate this fundamental frequency signal to eliminate the 3rd order harmonics of these local oscillated signals.
8. modulator approach according to claim 7, wherein above-mentioned modulation step comprises:
According to the phase angle is these local oscillated signals of 0 °, 210 °, 270 °, 300 °, the same-phase signal of this fundamental frequency signal and the quadrature phase signal of this fundamental frequency signal, produces first modulation signal; And
According to the phase angle is these local oscillated signals of 30 °, 90 °, 120 °, 180 °, this same-phase signal of this fundamental frequency signal and this quadrature phase signal of this fundamental frequency signal, produces second modulation signal;
Wherein, this first modulation signal and this second modulation signal do not comprise the 3rd order harmonics of these local oscillated signals.
9. modulator approach according to claim 7, the step that wherein produces a plurality of first signals comprises:
According to this input signal, three times of frequency eliminations to be producing a plurality of secondary signals, the phase angle of these secondary signals be respectively 0 °, 120 °, 180 °, with 300 °;
According to the phase angle is these secondary signals of 120 °, 300 °, and the twice frequency elimination is these first signals of 30 °, 120 °, 210 °, 300 ° to produce the phase angle; And
According to the phase angle is these secondary signals of 0 °, 180 °, and the twice frequency elimination is these first signals of 0 °, 90 °, 180 ° 270 ° to produce the phase angle.
10. modulator approach according to claim 7, the step that wherein produces a plurality of first signals comprises:
According to this input signal, the twice frequency elimination to be producing a plurality of secondary signals, the phase angle of these secondary signals be respectively 0 °, 90 °, 180 °, with 270 °;
According to the phase angle is these secondary signals of 90 °, 270 °, and three times of frequency eliminations are these first signals of 30 °, 90 °, 210 °, 270 ° to produce the phase angle; And
According to the phase angle is these secondary signals of 0 °, 180 °, and three times of frequency eliminations are these first signals of 0 °, 120 °, 180 °, 300 ° to produce the phase angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100752704A CN1838525B (en) | 2006-04-18 | 2006-04-18 | Modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100752704A CN1838525B (en) | 2006-04-18 | 2006-04-18 | Modulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1838525A true CN1838525A (en) | 2006-09-27 |
| CN1838525B CN1838525B (en) | 2012-06-27 |
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ID=37015811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100752704A Active CN1838525B (en) | 2006-04-18 | 2006-04-18 | Modulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1838525B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441733A (en) * | 2012-03-30 | 2013-12-11 | 联发科技（新加坡）私人有限公司 | Mixer circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09153741A (en) * | 1995-09-13 | 1997-06-10 | Fujitsu Ltd | Modulator, indirect modulation type modulator and frequency multiplier |
| US6766158B1 (en) * | 2001-03-30 | 2004-07-20 | Skyworks Solutions, Inc. | Harmonic cancellation mixer |
-
2006
- 2006-04-18 CN CN2006100752704A patent/CN1838525B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441733A (en) * | 2012-03-30 | 2013-12-11 | 联发科技（新加坡）私人有限公司 | Mixer circuit |
| CN103441733B (en) * | 2012-03-30 | 2016-04-27 | 联发科技（新加坡）私人有限公司 | Mixer |
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| Publication number | Publication date |
|---|---|
| CN1838525B (en) | 2012-06-27 |
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