CN210578430U - Millimeter wave down conversion subassembly - Google Patents
Millimeter wave down conversion subassembly Download PDFInfo
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- CN210578430U CN210578430U CN201922337938.3U CN201922337938U CN210578430U CN 210578430 U CN210578430 U CN 210578430U CN 201922337938 U CN201922337938 U CN 201922337938U CN 210578430 U CN210578430 U CN 210578430U
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Abstract
The utility model discloses a millimeter wave down conversion subassembly, including the parallel millimeter wave down conversion passageway of two tunnel, two tunnel millimeter wave down conversion passageway the same, all including the tertiary frequency conversion passageway that connects gradually, the down conversion is realized with first local oscillator signal mixing in first order frequency conversion passageway to received signal, and the second level down conversion is realized with second local oscillator signal mixing to signal input second level frequency conversion passageway after the first order frequency conversion, and the third level down conversion is realized with third local oscillator signal mixing to signal input third level frequency conversion passageway after the second level frequency conversion, exports 70 MHz's intermediate frequency output signal. The frequency conversion component adopts three-level frequency conversion to realize that the down-conversion of the radio frequency input signal is an intermediate frequency signal, can be realized by adopting a conventional frequency mixer, and has high integrity of the signal content after the three-level frequency conversion.
Description
Technical Field
The utility model belongs to the technical field of wireless communication equipment, specifically speaking relates to a millimeter wave down conversion subassembly.
Background
Electromagnetic waves having a wavelength of from 10 to 1 millimeter and a frequency of from 30 to 300 gigahertz (GHz) are called millimeter waves, and a method of performing communication using millimeter waves is called millimeter wave communication, and radio communication is mainly used in millimeter wave communication technology.
The frequency conversion is the processing of the signal after the receiver receives the signal, and the signal after frequency conversion is transmitted to the digital processor for processing, and the information carried in the signal is analyzed, so that the communication is realized.
The utility model discloses an application number is 2018212853117's utility model discloses a millimeter wave broadband down converter, including fixed attenuator, low noise amplifier, equalizer, switch filter bank, mixer, first 2 frequency multipliers, first local oscillator wave filter, 2 frequency multipliers of second, second local oscillator wave filter, intermediate frequency amplifier and electric attenuator. As can be seen from the figure, the radio frequency input end, the local oscillator input end and the intermediate frequency output end are all provided with a fixed attenuator ATN 3580-05. The introduction of the fixed attenuator greatly improves the standing wave of the input end and the output end of the product.
The scheme adopts one-time mixing to realize the down-conversion of the radio frequency input, the frequency conversion frequency difference is large, the requirement on the frequency mixer is high, and the integrity of signals is easily influenced.
SUMMERY OF THE UTILITY MODEL
To foretell not enough among the prior art, the utility model provides a millimeter wave down conversion subassembly, this down conversion subassembly adopt tertiary frequency conversion to realize that the down conversion of radio frequency input signal is intermediate frequency signal, adopt conventional mixer to realize promptly, and the signal content integrity after the tertiary frequency conversion is high.
In order to achieve the above object, the utility model discloses a solution is: the utility model provides a millimeter wave down conversion subassembly, includes the parallel millimeter wave down conversion passageway of two ways, two the millimeter wave down conversion passageway the same, all including the tertiary frequency conversion passageway that connects gradually, the received signal realizes down conversion with first local oscillator signal mixing in first order frequency conversion passageway, and the signal input second level frequency conversion passageway after the first order frequency conversion realizes second level down conversion with second local oscillator signal mixing, and the signal input third level frequency conversion passageway after the second level frequency conversion realizes third level down conversion with third local oscillator signal mixing, exports 70 MHz's intermediate frequency output signal.
The first-stage frequency conversion channel comprises a first band-pass filter and is used for carrying out band-pass filtering on the received signals; the first attenuator is connected with the output end of the first band-pass filter and is used for attenuating the filtered signal; the first frequency mixer is connected with the output end of the first attenuator and mixes the attenuated signal with the first local oscillator signal; the first amplifier is connected with the output end of the first frequency mixer and used for amplifying the frequency-mixed signal; the second-stage frequency conversion channel comprises a second band-pass filter, the input end of the second band-pass filter is connected with the output end of the first amplifier, and the amplified signal is subjected to band-pass filtering; the second amplifier is connected with the output end of the second band-pass filter and used for amplifying the filtered signal; the second frequency mixer is connected with the output end of the second amplifier and mixes the amplified signal with a second local oscillation signal; the third-stage frequency conversion channel comprises a third band-pass filter, the input end of the third band-pass filter is connected with the output end of the second frequency mixer, and the third band-pass filter is used for performing band-pass filtering on the frequency-mixed signal; the third amplifier is connected with the output end of the third band-pass filter and used for amplifying the filtered signal; the third mixer is connected with the output end of the third amplifier and mixes the amplified signal with a third local oscillation signal; the fourth band-pass filter is connected with the output end of the third mixer and is used for carrying out band-pass filtering on the mixed signal; the first numerical control attenuator is connected with the output end of the fourth band-pass filter and is used for attenuating the signal subjected to band-pass filtering; the fourth amplifier is connected with the output end of the first numerical control attenuator and is used for amplifying the attenuated signals; and the second attenuator is connected with the output end of the fourth amplifier, attenuates the amplified signal and outputs an intermediate frequency output signal of 70 MHz. The noise coefficient of the down-conversion component is 14.1dB, and considering factors such as loss of a connector, the noise coefficient is deteriorated to a certain extent and is about 3-5 dB. When the down-conversion channel operates in the linear region, the third-order intermodulation of the channel is determined by the third-order intermodulation of the final amplifier, so that the OIP3 of the final amplifier is known to be 30 dBm. The third-order intermodulation suppression can be obtained by the formula: 2Pout-2OIP 3-60 dBc. Before the first-stage frequency mixing, the local oscillator reverse leakage signals and the image frequency signals which need to be subjected to frequency mixing are suppressed, and the suppression is better than 50 dBc.
When the input power is-80 dBm, the number of the first numerical control attenuator is attenuated by 0dB, the link gain is 10dB, and the output power is-70 dBm; when the input power is-10 dBm, the number setting attenuation of the first numerical control attenuator is adjustable, the link gain is 10dB, and the output power is-30-0 dBm. In summary, when the input power is-80 dBm to-10 dBm, the output power is in the range of-70 dBm to 0 dBm.
The frequency source module comprises a reference crystal oscillator, the reference crystal oscillator outputs a reference frequency, the input end of the reference frequency doubling module is connected with one output end of the reference crystal oscillator, the reference frequency is received and doubled, a frequency-doubled reference clock signal is output to the DDS module, the output end of the DDS module is connected with the input end of the first phase-locked loop, the output end of the first phase-locked loop is connected with the frequency multiplier 2, the frequency of the signal is doubled, and the frequency-doubled signal is input to the amplification filtering unit to be amplified and filtered and then is input to the first-stage frequency conversion channel as a first local oscillator signal; the other output end of the reference crystal oscillator is connected with a second phase-locked loop, and the second phase-locked loop directly outputs a second local oscillation signal and inputs the second local oscillation signal into a second-stage frequency conversion channel; the other output end of the second phase-locked loop is connected with the input end of the 2 frequency divider, the 2 frequency divider divides the frequency of the signal 2 and outputs a third local oscillation signal to be input into the third-stage frequency conversion channel, the reference crystal oscillator is a 100MHz synchronous crystal oscillator, and the synchronous crystal oscillator can generate a 100MHz reference clock and also can receive a 100MHz reference clock sent from the outside. The local oscillator power is 13dBm, the local oscillator signal is connected in series into the microwave channel through the mixer, but the mixer can restrain 30dBc to the IF end of the mixer.
The frequency source module adopts DDS + PLL mode of frequency doubling again, in DDS + PLL scheme of frequency doubling again, at first by the acoustic meter filter filtering after the DDS output, near-end spurious is very little, far-end spurious is big, such spurious is relatively far away because of deviating from dominant frequency, by the effectual suppression of acoustic meter filter filtering, and PLL itself is equivalent to the tracking filter of a narrow-band high Q value, most far-end spurious can all be suppressed fine, can realize that spurious suppression is less than or equal to-60 dBc.
The amplifying and filtering unit is also connected with a first power divider, and the first power divider divides a first local oscillation signal into 2 paths of first-stage frequency conversion channels which are respectively input into two paths of millimeter wave down-conversion channels; a second local oscillation signal directly output by the second phase-locked loop is divided into two paths of second-stage frequency conversion channels respectively input into the two paths of millimeter wave down-conversion channels through a second power divider; the 2 frequency divider is further connected with a third power divider, the third power divider divides a third local oscillator signal into 2 paths, and one path of signal is divided into 2 paths by a fourth power divider and is respectively input into two third-stage frequency conversion channels of the millimeter wave down-conversion channel.
The first amplifier, the second amplifier, the third amplifier and the fourth amplifier are amplifiers with flatness not exceeding 0.5dB in any 30MHz band, and the gain flatness of the whole channel can meet the requirement that the flatness not exceeding 1.0dB in any 30MHz band.
The utility model has the advantages that:
(1) the frequency conversion component adopts three-level frequency conversion to realize that the down-conversion of the radio frequency input signal is an intermediate frequency signal, can be realized by adopting a conventional frequency mixer, and has high integrity of the signal content after the three-level frequency conversion.
Drawings
Fig. 1 is a block diagram of a millimeter wave down conversion module according to the present invention;
FIG. 2 is a schematic diagram of the millimeter wave down conversion channel of the present invention;
fig. 3 is a schematic diagram of a frequency source module.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in FIG. 1, a millimeter wave down conversion assembly comprises two parallel millimeter wave down conversion channels, wherein the millimeter wave down conversion channels are the same and comprise three-level frequency conversion channels connected in sequence, a received signal is mixed with a first local oscillation signal in a first-level frequency conversion channel to realize down conversion, the signal after the first-level frequency conversion is input into a second-level frequency conversion channel to realize second-level down conversion together with a second local oscillation signal, the signal after the second-level frequency conversion is input into the third-level frequency conversion channel to realize third-level down conversion together with a third local oscillation signal, and a 70MHz intermediate frequency output signal is output.
As shown in fig. 2, the first stage frequency conversion channel includes a first band-pass filter for band-pass filtering the received signal; the first attenuator is connected with the output end of the first band-pass filter and is used for attenuating the filtered signal; the first frequency mixer is connected with the output end of the first attenuator and mixes the attenuated signal with the first local oscillator signal; the first amplifier is connected with the output end of the first frequency mixer and used for amplifying the frequency-mixed signal; the second-stage frequency conversion channel comprises a second band-pass filter, the input end of the second band-pass filter is connected with the output end of the first amplifier, and the amplified signal is subjected to band-pass filtering; the second amplifier is connected with the output end of the second band-pass filter and used for amplifying the filtered signal; the second frequency mixer is connected with the output end of the second amplifier and mixes the amplified signal with a second local oscillation signal; the third-stage frequency conversion channel comprises a third band-pass filter, the input end of the third band-pass filter is connected with the output end of the second frequency mixer, and the third band-pass filter is used for performing band-pass filtering on the frequency-mixed signal; the third amplifier is connected with the output end of the third band-pass filter and used for amplifying the filtered signal; the third mixer is connected with the output end of the third amplifier and mixes the amplified signal with a third local oscillation signal; the fourth band-pass filter is connected with the output end of the third mixer and is used for carrying out band-pass filtering on the mixed signal; the first numerical control attenuator is connected with the output end of the fourth band-pass filter and is used for attenuating the signal subjected to band-pass filtering; the fourth amplifier is connected with the output end of the first numerical control attenuator and is used for amplifying the attenuated signals; and the second attenuator is connected with the output end of the fourth amplifier, attenuates the amplified signal and outputs an intermediate frequency output signal of 70 MHz. The noise coefficient of the down-conversion component is 14.1dB, and considering factors such as loss of a connector, the noise coefficient is deteriorated to a certain extent and is about 3-5 dB. When the down-conversion channel operates in the linear region, the third-order intermodulation of the channel is determined by the third-order intermodulation of the final amplifier, so that the OIP3 of the final amplifier is known to be 30 dBm. The third-order intermodulation suppression can be obtained by the formula: 2Pout-2OIP 3-60 dBc. Before the first-stage frequency mixing, the local oscillator reverse leakage signal and the image frequency signal which need to be subjected to frequency mixing are suppressed, and the suppression is better than 50dBc according to the amplitude-frequency characteristic of the filter.
When the input power is-80 dBm, the number of the first numerical control attenuator is attenuated by 0dB, the link gain is 10dB, and the output power is-70 dBm; when the input power is-10 dBm, the number setting attenuation of the first numerical control attenuator is adjustable, the link gain is 10dB, and the output power is-30-0 dBm. In summary, when the input power is-80 dBm to-10 dBm, the output power is in the range of-70 dBm to 0 dBm.
The down-conversion module further includes a frequency source module, as shown in fig. 3, where the frequency source module includes a reference crystal oscillator, the reference crystal oscillator outputs a reference frequency, an input end of the reference frequency doubling module is connected to an output end of the reference crystal oscillator, receives the reference frequency, doubles the reference frequency, a frequency-doubled reference clock signal is output to the DDS module, an output end of the DDS module is connected to an input end of the first phase-locked loop, an output end of the first phase-locked loop is connected to the frequency multiplier 2, doubles the frequency of the signal, and the frequency-doubled signal is input to the amplification filtering unit for amplification filtering and then is input to the first-stage frequency conversion channel as a first local oscillator signal; the other output end of the reference crystal oscillator is connected with a second phase-locked loop, and the second phase-locked loop directly outputs a second local oscillation signal and inputs the second local oscillation signal into a second-stage frequency conversion channel; the other output end of the second phase-locked loop is connected with the input end of the 2 frequency divider, the 2 frequency divider divides the frequency of the signal 2 and outputs a third local oscillation signal to be input into the third-stage frequency conversion channel, the reference crystal oscillator is a 100MHz synchronous crystal oscillator, and the synchronous crystal oscillator can generate a 100MHz reference clock and also can receive a 100MHz reference clock sent from the outside. The local oscillator power is 13dBm, the local oscillator signal is connected in series into the microwave channel through the mixer, but the mixer can restrain 30dBc to the IF end of the mixer.
The frequency source module adopts DDS + PLL mode of frequency doubling again, in DDS + PLL scheme of frequency doubling again, at first by the acoustic meter filter filtering after the DDS output, near-end spurious is very little, far-end spurious is big, such spurious is relatively far away because of deviating from dominant frequency, by the effectual suppression of acoustic meter filter filtering, and PLL itself is equivalent to the tracking filter of a narrow-band high Q value, most far-end spurious can all be suppressed fine, can realize that spurious suppression is less than or equal to-60 dBc.
The amplifying and filtering unit is also connected with a first power divider, and the first power divider divides a first local oscillation signal into 2 paths of first-stage frequency conversion channels which are respectively input into two paths of millimeter wave down-conversion channels; a second local oscillation signal directly output by the second phase-locked loop is divided into two paths of second-stage frequency conversion channels respectively input into the two paths of millimeter wave down-conversion channels through a second power divider; the 2 frequency divider is further connected with a third power divider, the third power divider divides a third local oscillator signal into 2 paths, and one path of signal is divided into 2 paths by a fourth power divider and is respectively input into two third-stage frequency conversion channels of the millimeter wave down-conversion channel.
The first amplifier, the second amplifier, the third amplifier and the fourth amplifier are amplifiers with flatness not exceeding 0.5dB in any 30MHz band, and the gain flatness of the whole channel can meet the requirement that the flatness not exceeding 1.0dB in any 30MHz band.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (6)
1. A millimeter wave down conversion assembly, characterized in that: including the parallel millimeter wave down conversion passageway of two ways, two ways millimeter wave down conversion passageway the same, all including the tertiary frequency conversion passageway that connects gradually, the received signal realizes down converting with first local oscillator signal mixing in first order frequency conversion passageway, and the signal input second level frequency conversion passageway after the first order frequency conversion realizes second level down conversion with second local oscillator signal mixing, and the signal input third level frequency conversion passageway after the second level frequency conversion realizes third level down conversion with third local oscillator signal mixing, exports 70 MHz's intermediate frequency output signal.
2. The millimeter wave down conversion assembly of claim 1, wherein: the first-stage frequency conversion channel comprises a first band-pass filter and is used for carrying out band-pass filtering on the received signals; the first attenuator is connected with the output end of the first band-pass filter and is used for attenuating the filtered signal; the first frequency mixer is connected with the output end of the first attenuator and mixes the attenuated signal with the first local oscillator signal; the first amplifier is connected with the output end of the first frequency mixer and used for amplifying the frequency-mixed signal; the second-stage frequency conversion channel comprises a second band-pass filter, the input end of the second band-pass filter is connected with the output end of the first amplifier, and the amplified signal is subjected to band-pass filtering; the second amplifier is connected with the output end of the second band-pass filter and used for amplifying the filtered signal; the second frequency mixer is connected with the output end of the second amplifier and mixes the amplified signal with a second local oscillation signal; the third-stage frequency conversion channel comprises a third band-pass filter, the input end of the third band-pass filter is connected with the output end of the second frequency mixer, and the third band-pass filter is used for performing band-pass filtering on the frequency-mixed signal; the third amplifier is connected with the output end of the third band-pass filter and used for amplifying the filtered signal; the third mixer is connected with the output end of the third amplifier and mixes the amplified signal with a third local oscillation signal; the fourth band-pass filter is connected with the output end of the third mixer and is used for carrying out band-pass filtering on the mixed signal; the first numerical control attenuator is connected with the output end of the fourth band-pass filter and is used for attenuating the signal subjected to band-pass filtering; the fourth amplifier is connected with the output end of the first numerical control attenuator and is used for amplifying the attenuated signals; and the second attenuator is connected with the output end of the fourth amplifier, attenuates the amplified signal and outputs an intermediate frequency output signal of 70 MHz.
3. The millimeter wave down conversion assembly of claim 1, wherein: the frequency source module comprises a reference crystal oscillator, the reference crystal oscillator outputs a reference frequency, the input end of the reference frequency doubling module is connected with one output end of the reference crystal oscillator, the reference frequency is received and doubled, a frequency-doubled reference clock signal is output to the DDS module, the output end of the DDS module is connected with the input end of the first phase-locked loop, the output end of the first phase-locked loop is connected with the frequency multiplier 2, the frequency of the signal is doubled, and the frequency-doubled signal is input to the amplification filtering unit to be amplified and filtered and then is input to the first-stage frequency conversion channel as a first local oscillator signal; the other output end of the reference crystal oscillator is connected with a second phase-locked loop, and the second phase-locked loop directly outputs a second local oscillation signal and inputs the second local oscillation signal into a second-stage frequency conversion channel; and the other output end of the second phase-locked loop is connected with the input end of the 2 frequency divider, and the 2 frequency divider divides the frequency of the signal 2 and outputs a third local oscillation signal to be input into a third-stage frequency conversion channel.
4. The millimeter wave down conversion assembly of claim 3, wherein: the amplifying and filtering unit is also connected with a first power divider, and the first power divider divides a first local oscillation signal into 2 paths of first-stage frequency conversion channels which are respectively input into two paths of millimeter wave down-conversion channels; a second local oscillation signal directly output by the second phase-locked loop is divided into two paths of second-stage frequency conversion channels respectively input into the two paths of millimeter wave down-conversion channels through a second power divider; the 2 frequency divider is further connected with a third power divider, the third power divider divides a third local oscillator signal into 2 paths, and one path of signal is divided into 2 paths by a fourth power divider and is respectively input into two third-stage frequency conversion channels of the millimeter wave down-conversion channel.
5. The millimeter wave down conversion assembly of claim 3, wherein: the reference crystal oscillator is a 100MHz synchronous crystal oscillator.
6. The millimeter wave down conversion assembly of claim 2, wherein: the first amplifier, the second amplifier, the third amplifier and the fourth amplifier are amplifiers with flatness not exceeding 0.5dB in any 30MHz band.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922337938.3U CN210578430U (en) | 2019-12-23 | 2019-12-23 | Millimeter wave down conversion subassembly |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922337938.3U CN210578430U (en) | 2019-12-23 | 2019-12-23 | Millimeter wave down conversion subassembly |
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| CN210578430U true CN210578430U (en) | 2020-05-19 |
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| CN201922337938.3U Active CN210578430U (en) | 2019-12-23 | 2019-12-23 | Millimeter wave down conversion subassembly |
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