CN201360239Y - Frequency mixing device - Google Patents
Frequency mixing device Download PDFInfo
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- CN201360239Y CN201360239Y CNU2009201054427U CN200920105442U CN201360239Y CN 201360239 Y CN201360239 Y CN 201360239Y CN U2009201054427 U CNU2009201054427 U CN U2009201054427U CN 200920105442 U CN200920105442 U CN 200920105442U CN 201360239 Y CN201360239 Y CN 201360239Y
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Abstract
The utility model discloses a frequency mixing device which comprises a resistive circuit, frequency conversion circuit and a current-voltage conversion circuit, wherein, the resistive circuit comprises a first resistor and a second resistor connected in series, and a switch tube, the source electrode and drain electrode of the switch tube are respectively in bridge connection with both ends of the first resistor, the grid electrode of the switch tube is connected with local oscillator signal VLOO and the source electrode is connected with voltage signal VIN; the frequency conversion circuit is used for converting the frequency of current signal converted from VIN under the control of VLOO from resistive circuit into output frequency; the current-voltage conversion circuit is used for converting the frequency-converted current signal into voltage signal and outputting the voltage signal. As the switch tube is adopted in the input resistive branch circuit, harmonic wave interference can be eliminated effectively and the problems that the frequency mixing device in prior art has over harmonic wave interference and the useful signal can be possibly concealed by harmonic wave interference signal so as to cause system failure are solved.
Description
Technical field
The utility model relates to integrated circuit fields, in particular to a kind of mixer device.
Background technology
Mixer device is the important module in the semiconductor integrated circuit.General mixer device is driven by local oscillator (Local Oscillation) signal of a certain characteristic frequency, multiply each other by input signal and local oscillation signal, generation comprises frequency input signal and local oscillation signal first harmonic frequency and local oscillation signal high order harmonic component frequency sum, and the output signal of the frequency component of the difference of frequency input signal and local oscillation signal first harmonic frequency and local oscillation signal high order harmonic component frequency.Usually having only the combined frequency component of input signal and local oscillator first harmonic (we are referred to as first-harmonic) is the useful signal that we want, and other higher harmonic components belong to Harmonic Interference.Because the existence of Harmonic Interference, mixer device in the useful signal frequency conversion, also can drop on those interference signal in local oscillator harmonic component frequency conversion scope and be added on the useful signal, thereby worsen quality of output signals.Therefore the Harmonic Interference inhibition is an important topic in the mixer device design.
Mixer device form commonly used in the analog integrated circuit comprises active mixer device and mixer device.Mixer device has simple in structure than active mixer device, linearity height, advantage such as noise characteristic is good.Along with semiconductor technology develops to deep-submicron, the advantage of mixer device is more obvious, therefore obtains more and more general application.
Fig. 1 shows traditional differential mixer device structure chart, and it is made up of input resistance, frequency changer circuit and current-voltage converter.Wherein input resistance is made up of R1, R2, connects mixer device input and frequency changer circuit; Frequency changer circuit is made up of nmos pass transistor M1, M2, M3 and M4.Wherein the source electrode of M1 and M2, M3 and M4 is connected to each other, and M1 links to each other in twos with the drain electrode of M3, M2 and M4, forms " gilbert " structure; Current-voltage converter connects frequency changer circuit and mixer device output.During work, input voltage signal is entered by the mixer device input, be converted to current signal through input resistance, switching tube M1, M2, M3 and M4 are driven by difference local oscillation signal VLOP, VLON, current signal is converted to output frequency, transfers voltage signal output again to by current-voltage converter at last.
Because mixer device switching tube M1-M4 is fully operational in open/close state, therefore can use the square wave local oscillation signal to drive.Adopt the square wave local oscillation signal can simplify the design of local oscillator drive circuit, in the deep submicron process design, have advantage.
It is 1 o'clock time domain converted-wave figure that Fig. 2 shows mixer device conversion gain among Fig. 1.The ground that is without loss of generality, the conversion gain of supposing mixer device among Fig. 1 is 1, then its time domain converted-wave is as shown in Figure 2.Dotted line is represented the ideal sinusoidal converted-wave among Fig. 2, and solid line is represented the actual converted waveform under the driving of square wave local oscillator.
Fig. 3 shows conversion gain that Fig. 2 obtains through the Laplace transform oscillogram at frequency domain.In Fig. 3, there is the odd harmonic conversion gain in traditional mixer device outside local oscillator first-harmonic conversion gain.General harmonic components near the local oscillator fundamental frequency is the most remarkable for the influence of system, so we only are concerned about three times, five times Harmonic Interference usually.By calculating as can be known, traditional mixer device first-harmonic conversion gain-0.91dB shown in Figure 1, three times, five times harmonic conversion gains are respectively-10.45dB ,-14.89dB.Because the harmonic conversion gain is very approaching with the first-harmonic conversion gain, when having strong interference signal in the harmonic conversion frequency band, the output useful signal is flooded by the Harmonic Interference signal probably, causes system to work.
In realizing the utility model process, the inventor finds that there is the excessive problem of Harmonic Interference in mixer device in the prior art, causes exporting useful signal and is flooded by the Harmonic Interference signal probably, causes system to work.
The utility model content
The utility model aims to provide a kind of mixer device, can solve that mixer device exists Harmonic Interference excessive in the prior art, causes exporting useful signal and is flooded by the Harmonic Interference signal probably, the problem that causes system to work.
In embodiment of the present utility model, a kind of mixer device is provided, comprise: resistance circuit, it comprises first resistance and second resistance and the switching tube of series connection, wherein, the source electrode of switching tube and drain electrode are connected across the two ends of first resistance respectively, and the grid of switching tube inserts local oscillation signal VLOO, and its source electrode inserts voltage signal VIN; Frequency changer circuit is used for being converted to output frequency by resistance circuit conversion current signal that VIN flowed out under VLOO control; Current-voltage conversion circuit is used for current signal after frequency conversion is converted to voltage signal output.
The foregoing description is by adopting switching tube in the input resistance branch road, effectively harmonic carcellation disturbs, overcome that mixer device exists Harmonic Interference excessive in the prior art, caused exporting useful signal and flooded by the Harmonic Interference signal probably, the problem that causes system to work.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 shows traditional differential mixer device structure chart;
It is 1 o'clock time domain converted-wave figure that Fig. 2 shows mixer device conversion gain among Fig. 1;
Fig. 3 shows conversion gain that Fig. 2 obtains through the Laplace transform oscillogram at frequency domain;
Fig. 4 shows the mixer device structure chart according to an embodiment of the present utility model;
Fig. 5 shows the mixer device structure chart according to an embodiment of the present utility model;
Fig. 6 shows the mixer device structure chart according to an embodiment of the present utility model;
Fig. 7 shows the oscillogram of local oscillation signal VLOP, local oscillation signal VLON, local oscillation signal VLOPO and local oscillation signal VLONO according to an embodiment of the present utility model;
Fig. 8 shows the mixer device time domain converted-wave figure that drives according to local oscillation signal among Fig. 7;
Fig. 9 shows the frequency domain converted-wave figure that waveform obtains through Laplace transform among Fig. 8.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
Fig. 4 shows the mixer device according to an embodiment of the present utility model, comprising:
Resistance circuit, it comprises first resistance and second resistance and the switching tube of series connection, and wherein, the source electrode of switching tube and drain electrode are connected across the two ends of first resistance respectively, and the grid of switching tube inserts local oscillation signal VLOO, and its source electrode inserts voltage signal VIN;
Frequency changer circuit is used for being converted to output frequency by resistance circuit conversion current signal that VIN flowed out under VLOO control;
Current-voltage conversion circuit is used for current signal after frequency conversion is converted to voltage signal output.
The foregoing description is by adopting switching tube in the input resistance branch road, effectively harmonic carcellation disturbs, overcome that mixer device exists Harmonic Interference excessive in the prior art, caused exporting useful signal and flooded by the Harmonic Interference signal probably, the problem that causes system to work.
Preferably, VLOO is a differential signal, comprises VLOPO and VLONO; VIN is a differential signal, comprises VINP and VINN; The voltage signal of output is a differential signal, comprises VOUTP and VOUTN, and differential signal has immunity preferably to external electromagnetic interference, is fit to present embodiment.
Fig. 5 shows the mixer device according to an embodiment of the present utility model, in Fig. 5, resistance circuit comprises the first input resistance branch road and the second input resistance branch road, first resistance branch comprises first resistance R 3 and second resistance R 1 and the switching tube M5 of series connection, wherein, the source electrode of switching tube M5 and drain electrode are connected across the two ends of first resistance R 3 respectively, and the grid of switching tube M5 inserts local oscillation signal VLOPO, and its source electrode inserts voltage signal VINP; Second resistance branch comprises first resistance R 4 and second resistance R 2 and the switching tube M6 of series connection, wherein, the source electrode of switching tube M6 and drain electrode are connected across the two ends of first resistance R 4 respectively, and the grid of switching tube M6 inserts local oscillation signal VLONO, and its source electrode inserts voltage signal VINN.
Preferably, frequency changer circuit is a difference channel, and the antijamming capability of difference channel is stronger, is fit to present embodiment.
Preferably, frequency changer circuit comprise common source switching tube that difference connects to M1 and M2 and common source switching tube to M3 and M4, wherein, the grid of switching tube M1 and switching tube M2 inserts local oscillation signal VLOP and local oscillation signal VLON respectively, and the grid of switching tube M4 and switching tube M3 inserts local oscillation signal VLOP and local oscillation signal VLON respectively; One end of resistance R 1 is connected with the common source of switching tube to M1 and M2, and an end of resistance R 2 is connected with the common source of switching tube to M3 and M4, and the current signal that is used for being flowed out by resistance circuit is converted to output frequency.
Preferably, current-voltage conversion circuit is a difference channel, and the antijamming capability of difference channel is stronger, is fit to present embodiment.
Fig. 6 shows the mixer device structure chart according to an embodiment of the present utility model, in Fig. 6, current-voltage conversion circuit comprises current-voltage converter, wherein, current-voltage converter comprises resistance R 5, resistance R 6 and difference amplifier OPA, and resistance R 5 and resistance R 6 are connected the input and output of difference amplifier OPA respectively, forms the closed loop feedback structure, realize the current-voltage translation function, be used for changing current signal after frequency conversion into voltage signal output.
Preferably, switching tube M1 and the drain electrode of switching tube M4 are connected the input of difference amplifier OPA respectively.
Preferably, switching tube M5 and switching tube M6 are the NMOS pipes, and NMOS pipe noise factor is less, and conversion speed is very fast, is fit to present embodiment.
Preferably, the resistance value of resistance R 1 and resistance R 2 is respectively R ohm, the resistance value of resistance R 3 and resistance R 4 be respectively (
) R ohm.
Fig. 7 shows the oscillogram of local oscillation signal VLOP, local oscillation signal VLON, local oscillation signal VLOPO and local oscillation signal VLONO according to an embodiment of the present utility model.The 0-8 time interval is an one-period in Fig. 7.Mixer device is moving by local oscillation signal VLOP, local oscillation signal VLON, local oscillation signal VLOPO and local oscillation signal VLONO Ma Qu in the present embodiment.
Fig. 8 shows the mixer device time domain converted-wave figure that drives according to local oscillation signal among Fig. 7.
Fig. 9 shows the frequency domain converted-wave figure that waveform obtains through Laplace transform among Fig. 8.As seen from Figure 9, mixer device first-harmonic conversion gain is-0.06dB in the foregoing description, and traditional mixer device more shown in Figure 1 has a little raising, and three times, the five times more traditional mixer devices of harmonic conversion gain significantly reduce, and is infinitely small in theory.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present utility model or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the utility model is not restricted to any specific hardware and software combination.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. a mixer device is characterized in that, comprising:
Resistance circuit, it comprises first resistance and second resistance and the switching tube of series connection, and wherein, the source electrode of described switching tube and drain electrode are connected across the two ends of described first resistance respectively, the grid of described switching tube inserts local oscillation signal VLOO, and its source electrode inserts voltage signal VIN;
Frequency changer circuit is used for being converted to output frequency by described resistance circuit conversion current signal that VIN flowed out under VLOO control;
Current-voltage conversion circuit is used for the described current signal after the frequency conversion is converted to voltage signal output.
2. mixer device according to claim 1 is characterized in that VLOO is a differential signal, comprises VLOPO and VLONO; VIN is a differential signal, comprises VINP and VINN; The voltage signal of output is a differential signal, comprises VOUTP and VOUTN.
3. mixer device according to claim 2 is characterized in that, described resistance circuit comprises the first input resistance branch road and the second input resistance branch road,
Described first resistance branch, first resistance R 3 and second resistance R 1 and the switching tube M5 that comprise series connection, wherein, the source electrode of described switching tube M5 and drain electrode are connected across the two ends of described first resistance R 3 respectively, the grid of described switching tube M5 inserts local oscillation signal VLOPO, and its source electrode inserts voltage signal VINP;
Described second resistance branch, first resistance R 4 and second resistance R 2 and the switching tube M6 that comprise series connection, wherein, the source electrode of described switching tube M6 and drain electrode are connected across the two ends of described first resistance R 4 respectively, the grid of described switching tube M6 inserts local oscillation signal VLONO, and its source electrode inserts voltage signal VINN.
4. mixer device according to claim 1 is characterized in that described frequency changer circuit is a difference channel.
5. mixer device according to claim 4 is characterized in that, described frequency changer circuit comprise common source switching tube that difference connects to M1 and M2 and common source switching tube to M3 and M4, wherein
The grid of switching tube M1 and switching tube M2 inserts local oscillation signal VLOP and local oscillation signal VLON respectively, and the grid of switching tube M4 and switching tube M3 inserts local oscillation signal VLOP and local oscillation signal VLON respectively;
One end of described resistance R 1 is connected with the common source of described switching tube to M1 and M2, and an end of described resistance R 2 is connected with the common source of described switching tube to M3 and M4.
6. mixer device according to claim 5 is characterized in that described current-voltage conversion circuit is a difference channel.
7. mixer device according to claim 6 is characterized in that described current-voltage conversion circuit comprises current-voltage converter, wherein
Described current-voltage converter comprises resistance R 5, resistance R 6 and difference amplifier OPA, and resistance R 5 and resistance R 6 are connected the input and output of described difference amplifier OPA respectively.
8. mixer device according to claim 7 is characterized in that, the drain electrode of described switching tube M1 and switching tube M4 is connected the input of described difference amplifier OPA respectively.
9. mixer device according to claim 1 is characterized in that, described switching tube is the NMOS pipe.
10. mixer device according to claim 1 is characterized in that, the resistance value of described first resistance is R ohm, and the resistance value of described second resistance is
Ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201054427U CN201360239Y (en) | 2009-01-23 | 2009-01-23 | Frequency mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201054427U CN201360239Y (en) | 2009-01-23 | 2009-01-23 | Frequency mixing device |
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| Publication Number | Publication Date |
|---|---|
| CN201360239Y true CN201360239Y (en) | 2009-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009201054427U Expired - Fee Related CN201360239Y (en) | 2009-01-23 | 2009-01-23 | Frequency mixing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242823A (en) * | 2013-06-08 | 2014-12-24 | 锐迪科微电子科技（上海）有限公司 | Mixing switching circuit and mixer |
-
2009
- 2009-01-23 CN CNU2009201054427U patent/CN201360239Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242823A (en) * | 2013-06-08 | 2014-12-24 | 锐迪科微电子科技（上海）有限公司 | Mixing switching circuit and mixer |
| CN104242823B (en) * | 2013-06-08 | 2017-10-10 | 锐迪科微电子科技（上海）有限公司 | It is mixed on-off circuit and frequency mixer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: JIANGSU HONGJIA ELECTRONIC TECHNOLOGY CO., LTD. Assignor: Beijing Langbo Xinwei Technology Co., Ltd. Contract record no.: 2014120000079 Denomination of utility model: Noise suppression circuit used for frequency mixing device and relevant frequency mixing device thereof Granted publication date: 20091209 License type: Common License Record date: 20140928 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091209 Termination date: 20150123 |
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| EXPY | Termination of patent right or utility model |