CN104242828A - Low noise frequency converter - Google Patents
Low noise frequency converter Download PDFInfo
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- CN104242828A CN104242828A CN201410550303.0A CN201410550303A CN104242828A CN 104242828 A CN104242828 A CN 104242828A CN 201410550303 A CN201410550303 A CN 201410550303A CN 104242828 A CN104242828 A CN 104242828A
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Abstract
The invention discloses a low noise frequency converter. The low noise frequency converter comprises, a passive filter, a prime amplifier, a prime mixer, an active filter, a second-level amplifier, a mixer, a final amplifier and an alternating current reactor which are sequentially connected, the prime mixer is connected with a fourth-level amplifier and a radiator, a frequency synthesizer is further connected to the fourth-level amplifier, and the frequency synthesizer is also connected with a power divider; the mixer is also connected with the radiator and a third-level amplifier, the third-level amplifier is also connected with a lock-in amplifier, the lock-in amplifier is also connected with the power divider, and the power divider is connected with a local oscillator providing 10 MHz signals. By means of the above principles, the low noise frequency converter can reduce noise, avoid damage of other mechanical components caused by vibration and reduce temperature to avoid overhigh temperature of the device and further enables the electronic element to work more stably.
Description
Technical field
The present invention relates to frequency converter field, be specifically related to the frequency conversion device that noise is low.
Background technology
In recent years, along with the fast development of microwave device, in radar and the communications field, receiving system generally have employed low noise amplifier as prime, greatly reduces system noise factor, improves sensitivity.The influence and effect fact of frequency mixer to receiving system is really not so.For single-sideband system, the single-sideband system that particularly intermediate frequency is lower, radial noise can bring very large impact to noise.Therefore wider at low noise amplifier frequency band and in the single-sideband system that intermediate frequency is not high, still need to use frequency mixer, and in frequency mixer, also comprise the low frequency conversion device of noise.We know frequency converter export in low-order harmonic component and rotor natural machanical frenquence generation resonance time, then noise increase; Higher harmonic components in frequency converter exports and iron core, casing, bearing bracket stand etc., when resonance occurs in respective natural frequency vicinity, then noise increases.The grating noise that existing frequency converter drive motor produces is comparatively remarkable in low frequency range, and the vibration that noise produces also can cause damage to mechanical part.In addition, during frequency converter work, the magnetic field that high order harmonic component in output waveform causes produces magnetic driven power to many mechanical parts, hormetic frequency is close with the natural frequency of these mechanical parts or resonance will occur when overlapping, vibration also can shine into damage to mechanical part, wherein to vibration effect large mainly compared with the harmonic component of low order.The reliability of existing frequency converter is also by the impact of temperature simultaneously, how to ensure that frequency converter temperature is unlikely to too high, by noise reduction, prevents vibration from seeming particularly important to the damage of mechanical part.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, provide the frequency conversion device that noise is low, this frequency converter can reduce noise, prevents from vibrating the damage to other mechanical part, and reduces temperature, makes the temperature of device be unlikely to too high, makes this electronic component work more stable.
For solving above-mentioned technical problem, the present invention is by the following technical solutions: the frequency conversion device that noise is low, comprise connect successively passive filter, pre-amplifier, prime frequency mixer, active filter, two-stage amplifier, frequency mixer, final amplifier with exchange anti-electrical equipment, described prime frequency mixer also connects level Four amplifier and radiator simultaneously, level Four amplifier is gone back rate of connections synthesizer, and frequency synthesizer is also connected with power splitter; Described frequency mixer also connects radiator and third stage amplifier, and third stage amplifier is also connected with phase locking unit, and phase locking unit is also connected with power splitter, power splitter also connects the local vibration source providing 10MHz signal.
Passive filter being set in the front end of this device, for filtering high order harmonic component, avoiding high order harmonic component on the impact of input signal.By the signal wave after prime frequency mixer after mixing again through the filter action of active filter, active filter automatically produces an and electric current that phase place just in time contrary identical with the amplitude of harmonic current, thus effectively absorbing harmonic current, the harmonic wave avoiding this electronic component to produce has an impact to other parts.At output signal end, also AC reactor is set in addition, to absorb the higher harmonic current composition in output current of frequency converter, thus plays reduction noise, weaken or eliminate vibration, prevent mechanical part impaired because of vibration.Prime frequency mixer and frequency mixer also arrange radiator timely by disperses heat, avoid the critical piece of this electronic component due to temperature too high and cause damage, improve the stability of this electronic component.
The frequency conversion device that this noise is low uses prime frequency mixer and these two frequency mixers of frequency mixer to realize down-conversion by secondary mixing.Frequency synthesizer and local vibration source can provide stable signal for down-conversion passage, stabilization signal encourages generation one band frequency signal f1-f2 at frequency synthesizer through power splitter DDS, and the stabilization signal that local vibration source produces produces through power splitter DDS excitation and through the phase locking frequency multiplying of phase locking unit the point frequency secondary local oscillation signal that frequency is L1.The downstream signal frequencies inputted from passive filter is f3-f4, the mixing that this signal realizes outputing signal with mixing synthesizer f1-f2 by prime frequency mixer produces the fixed intermediate frequency signal that frequency is L2, this intermediate-freuqncy signal and two local oscillation frequency signal L1 produce the intermediate-freuqncy signal of standard by the mixing of frequency mixer, then export.This device can provide stable local vibration source for down-conversion passage, and the frequency conversion device making noise low well can realize the control to supply frequency, reaches stability contorting alternating current machine rotating speed.
Described frequency synthesizer also connects humidity sensor.Humidity condition timely on response frequency synthesizer, then takes moisture preventive measure, and avoiding this device to make moist affects work, thus improves the stability of its work further.
Described passive filter is LC type passive filter.Before the frequency conversion device that noise is low, install LC type passive filter additional, filter high order harmonic component, suppress interference source, avoid higher harmonic wave that the leakage current of frequency converter output cable is increased, the situation of motor-output deficiency is occurred, improve the reliability of device.
Described passive filter is also connected with input signal.
AC reactor is also connected with output signal.
Compared with prior art, the invention has the beneficial effects as follows:
1, at output signal end, also AC reactor is set, to absorb the higher harmonic current composition in output current of frequency converter, thus plays reduction noise, weaken or eliminate vibration, prevent mechanical part impaired because of vibration.
2, frequency synthesizer also connects humidity sensor, the humidity condition timely on response frequency synthesizer, then takes moisture preventive measure, and avoiding this device to make moist affects work, thus improves the stability of its work further.
3, passive filter is set in the circuit and active filter carries out twice filtering, filters out harmonic signal wherein, avoid the interference of harmonic wave.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated, and embodiments of the invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, the frequency conversion device that noise of the present invention is low, comprise connect successively passive filter, pre-amplifier, prime frequency mixer, active filter, two-stage amplifier, frequency mixer, final amplifier with exchange anti-electrical equipment, described prime frequency mixer also connects level Four amplifier and radiator simultaneously, level Four amplifier is gone back rate of connections synthesizer, and frequency synthesizer is also connected with power splitter; Described frequency mixer also connects radiator and third stage amplifier, and third stage amplifier is also connected with phase locking unit, and phase locking unit is also connected with power splitter, power splitter also connects the local vibration source providing 10MHz signal.
Passive filter being set in the front end of this device, for filtering high order harmonic component, avoiding high order harmonic component on the impact of input signal.By the signal wave after prime frequency mixer after mixing again through the filter action of active filter, active filter automatically produces an and electric current that phase place just in time contrary identical with the amplitude of harmonic current, thus effectively absorbing harmonic current, the harmonic wave avoiding this electronic component to produce has an impact to other parts.At output signal end, also AC reactor is set in addition, to absorb the higher harmonic current composition in output current of frequency converter, thus plays reduction noise, weaken or eliminate vibration, prevent mechanical part impaired because of vibration.Prime frequency mixer and frequency mixer also arrange radiator timely by disperses heat, avoid the critical piece of this electronic component due to temperature too high and cause damage, improve the stability of this electronic component.
The frequency conversion device that this noise is low uses prime frequency mixer and these two frequency mixers of frequency mixer to realize down-conversion by secondary mixing.Frequency synthesizer and local vibration source can provide stable signal for down-conversion passage, stabilization signal encourages generation one band frequency signal f1-f2 at frequency synthesizer through power splitter DDS, and the stabilization signal that local vibration source produces produces through power splitter DDS excitation and through the phase locking frequency multiplying of phase locking unit the point frequency secondary local oscillation signal that frequency is L1.The downstream signal frequencies inputted from passive filter is f3-f4, the mixing that this signal realizes outputing signal with mixing synthesizer f1-f2 by prime frequency mixer produces the fixed intermediate frequency signal that frequency is L2, this intermediate-freuqncy signal and two local oscillation frequency signal L1 produce the intermediate-freuqncy signal of standard by the mixing of frequency mixer, then export.This device can provide stable local vibration source for down-conversion passage, and the frequency conversion device making noise low well can realize the control to supply frequency, reaches stability contorting alternating current machine rotating speed.Passive filter wherein realizes carrying out Frequency mixing processing to passing to prime frequency mixer after input signal filter and amplification again, by the frequency signal after the mixing of prime frequency mixer in the filtering again through active filter with pass to frequency mixer and carry out secondary mixing, signal transacting better effects if after amplifying.On the critical piece prime frequency mixer and frequency mixer of this device, go back set temperature transducer simultaneously, realize the detection of temperature, once it is too high to find that temperature raises, in time it is lowered the temperature, ensure its normal effective work, improve the reliability of device, extend the useful life of device.
Embodiment 2:
The present embodiment preferred concrete structure on the basis of above-described embodiment is as follows: described frequency synthesizer also connects humidity sensor.Humidity condition timely on response frequency synthesizer, then takes moisture preventive measure, and avoiding this device to make moist affects work, thus improves the stability of its work further.
Described passive filter is LC type passive filter.Before the frequency conversion device that noise is low, install LC type passive filter additional, filter high order harmonic component, suppress interference source, avoid higher harmonic wave that the leakage current of frequency converter output cable is increased, the situation of motor-output deficiency is occurred, improve the reliability of device.
Described passive filter is also connected with input signal.
AC reactor is also connected with output signal.
Just this invention can be realized as mentioned above.
Claims (5)
1. the frequency conversion device that noise is low, it is characterized in that: comprise connect successively passive filter, pre-amplifier, prime frequency mixer, active filter, two-stage amplifier, frequency mixer, final amplifier with exchange anti-electrical equipment, described prime frequency mixer also connects level Four amplifier and radiator simultaneously, level Four amplifier is gone back rate of connections synthesizer, and frequency synthesizer is also connected with power splitter; Described frequency mixer also connects radiator and third stage amplifier, and third stage amplifier is also connected with phase locking unit, and phase locking unit is also connected with power splitter, power splitter also connects the local vibration source providing 10MHz signal.
2. the frequency conversion device that noise according to claim 1 is low, is characterized in that: described frequency synthesizer also connects humidity sensor.
3. the frequency conversion device that noise according to claim 1 is low, is characterized in that: described passive filter is LC type passive filter.
4. the frequency conversion device that noise according to claim 1 is low, is characterized in that: described passive filter is also connected with input signal.
5. the frequency conversion device that noise according to claim 1 is low, is characterized in that: described AC reactor is also connected with output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410550303.0A CN104242828A (en) | 2014-10-17 | 2014-10-17 | Low noise frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410550303.0A CN104242828A (en) | 2014-10-17 | 2014-10-17 | Low noise frequency converter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101009491A (en) * | 2006-01-27 | 2007-08-01 | 络达科技股份有限公司 | Emitter with temperature compensation gain |
| US20100244903A1 (en) * | 2007-11-28 | 2010-09-30 | Bae Systems Plc | Tuneable filter |
| CN102752010A (en) * | 2011-04-21 | 2012-10-24 | 沈阳中科微电子有限公司 | Transceiving module used for communication base stations |
| CN103338048A (en) * | 2013-05-28 | 2013-10-02 | 桂林电子科技大学 | Reception method and unit of radio frequency front end of cognitive spectrum sensing receiver |
| CN204156814U (en) * | 2014-10-17 | 2015-02-11 | 绵阳雷迪创微电子科技有限公司 | Low noise frequency converter part |
-
2014
- 2014-10-17 CN CN201410550303.0A patent/CN104242828A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101009491A (en) * | 2006-01-27 | 2007-08-01 | 络达科技股份有限公司 | Emitter with temperature compensation gain |
| US20100244903A1 (en) * | 2007-11-28 | 2010-09-30 | Bae Systems Plc | Tuneable filter |
| CN102752010A (en) * | 2011-04-21 | 2012-10-24 | 沈阳中科微电子有限公司 | Transceiving module used for communication base stations |
| CN103338048A (en) * | 2013-05-28 | 2013-10-02 | 桂林电子科技大学 | Reception method and unit of radio frequency front end of cognitive spectrum sensing receiver |
| CN204156814U (en) * | 2014-10-17 | 2015-02-11 | 绵阳雷迪创微电子科技有限公司 | Low noise frequency converter part |
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Application publication date: 20141224 |