Two-time up-conversion method based on local oscillator source

Abstract

The invention discloses a two-time up-conversion method based on a local oscillator source. A local oscillator frequency division and separation unit, a first frequency mixing unit, a filtering amplification unit, a frequency multiplication filtering unit, a second frequency mixing unit and a radio frequency filtering unit are included. The first frequency mixing unit is respectively connected with the local oscillator frequency division and separation unit and the filter amplification unit; the local oscillator frequency division and separation unit is also connected with one end of the frequency multiplication filtering unit; the second frequency mixing unit is respectively connected with the filter amplification unit, the frequency multiplication filter unit and the radio frequency filter unit; the other end of the radio frequency filtering unit is used for radio frequency output. According to the invention, on the basis of a local oscillator source, through two times of frequency mixing, an intermediate frequency signal can be effectively converted into a required high-frequency radio frequency signal, and the use of the filter amplification unit and the radio frequency filter unit is helpful to remove unnecessary frequency components generated in the frequency mixing process; the multi-stage filtering and frequency mixing process can effectively suppress clutter signals in the system, and the clutter suppression effect of the final radio frequency signals is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of microwave signal processing, and in particular relates to a double up-conversion method based on a local oscillator source. Background Art

[0002] Up-conversion technology is a key core technology in modern electronic communication systems such as microwave / millimeter wave communications and radars. When a low-frequency narrowband intermediate frequency signal is up-converted to a high-frequency broadband radio frequency signal once, the existing single-conversion technology has poor intermodulation spurious signals between the local oscillator signal and the intermediate frequency multiple harmonic signals, as well as the leakage spurious signals of the local oscillator itself. The above two spurious signal suppression effects can only be achieved through the characteristics of the mixer itself. The principle block diagram of the existing single-conversion technology is shown below.

[0003] In the prior art, for example, the technical solution described in the patent with publication number CN117081584A is: a local oscillator source device, including: a crystal oscillator provides a reference signal of a first frequency; a frequency multiplication circuit multiplies its frequency to obtain a reference signal of a second frequency; a digital-to-analog conversion circuit converts the second reference signal into a continuous wave signal; a phase-locked loop circuit is used to track the continuous wave signal and output a local reference oscillation signal.

[0004] In the prior art, a low-frequency narrowband intermediate frequency signal is up-converted once to a high-frequency broadband RF signal. Local oscillator leakage and mixing intermodulation spurs fall within the RF broadband band and cannot be filtered out by the RF filter but can only be suppressed by the mixer itself. Therefore, the spurious suppression index is poor and cannot meet the requirements of high index and high performance. Summary of the invention

[0005] The purpose of the present invention is to provide a double up-conversion method based on a local oscillator source to solve the problem in the prior art proposed in the background technology that there are local oscillator leakage, mixing intermodulation spurs, and poor signal suppression, resulting in the inability to achieve high-performance signal transmission.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A double up-conversion method based on a local oscillator source includes a local oscillator frequency division and separation unit, a first frequency mixing unit, a filter amplification unit, a frequency multiplication filter unit, a second frequency mixing unit and a radio frequency filter unit;

[0008] One end of the first frequency mixing unit is used for intermediate frequency input; the other end of the first frequency mixing unit is respectively connected to the local oscillator frequency division and separation unit and the filter amplifier unit; one end of the local oscillator frequency division and separation unit is used for local oscillator input; the other end of the local oscillator frequency division and separation unit is also connected to one end of the frequency multiplication filter unit; the second frequency mixing unit is respectively connected to the filter amplifier unit, the frequency multiplication filter unit and the radio frequency filter unit;

[0009] The other end of the RF filter unit is used for RF output.

[0010] According to the above technical solution, the local oscillator frequency division and separation unit includes a frequency divider, a power divider, a first filter and a second filter; wherein one end of the frequency divider is used for local oscillator input, the other end of the frequency divider is connected to one end of the power divider, and the other end of the power divider is respectively connected to one end of the first filter and the second filter; the other end of the first filter is connected to the first mixing unit, and the other end of the second filter is connected to the frequency doubling filter unit.

[0011] According to the above technical solution, the first frequency mixing unit includes a first amplifier and a first frequency mixer; wherein one end of the first frequency mixer is used for intermediate frequency input, and the first frequency mixer is respectively connected to one end of the first amplifier and the filter amplification unit;

[0012] The other end of the first amplifier is connected to the first filter of the local oscillator frequency division and separation unit.

[0013] According to the above technical solution, the filtering and amplifying unit includes a third filter and a second amplifier; wherein one end of the third filter is connected to the first mixer of the first mixing unit, and the other end of the third filter is connected to one end of the second amplifier;

[0014] The other end of the second amplifier is connected to the second frequency mixing unit.

[0015] According to the above technical solution, the second frequency mixing unit includes a second frequency mixer and a third amplifier; wherein the second frequency mixer is respectively connected to one end of the third amplifier, the second amplifier of the filter amplifier unit and the radio frequency filter unit;

[0016] The other end of the third amplifier is connected to the frequency multiplication filter unit.

[0017] According to the above technical solution, the frequency multiplication filtering unit includes a frequency multiplier and a fourth filter; wherein one end of the frequency multiplier is connected to the second filter of the local oscillator frequency division and separation unit, and the other end of the frequency multiplier is connected to one end of the fourth filter;

[0018] The other end of the fourth filter is connected to the third amplifier of the second frequency mixing unit.

[0019] According to the above technical solution, the radio frequency filtering unit includes a fifth filter; one end of the fifth filter is connected to the second mixer of the second mixing unit, and the other end of the fifth filter is used for radio frequency output.

[0020] According to the above technical solution, the first amplifier and the third amplifier are driving amplifiers, and the second amplifier is a gain amplifier.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] In the present invention, the original local oscillator leakage signal and the multiple intermodulation signals with the intermediate frequency are moved outside the intermediate frequency bandwidth through the internal frequency conversion relationship; and through the out-of-band signal suppression function of an intermediate frequency filter, the spurious suppression effect of the original low-frequency narrow-band intermediate frequency signal being up-converted to a high-frequency broadband radio frequency signal is greatly improved.

[0023] In the present invention, the intermediate frequency signal can be effectively converted into the required high-frequency RF signal through two mixing operations, thereby improving the clutter suppression effect of the system. The use of the filtering and amplifying unit and the RF filtering unit helps to remove unnecessary frequency components generated in the mixing process, thereby enhancing the selectivity of the required signal. The multi-stage filtering and mixing process can effectively suppress the clutter signal in the system and improve the clutter suppression effect of the final RF signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a principle block diagram of a single up-conversion technology in the prior art;

[0025] Figure 2 This is a block diagram of the present invention's one-time up-conversion to high-frequency broadband radio frequency signal transmission;

[0026] Figure 3 This is a schematic diagram of the primary up-conversion technology of the present invention;

[0027] Figure 4 This is a typical spurious suppression diagram for an S-band double-balanced mixer;

[0028] Figure 5 It is a typical curve diagram of an intermediate frequency filter;

[0029] Figure 6 This is a typical indicator curve of S-band RF filter.

[0030] Markings in the figure: 100-local oscillator frequency division and separation unit, 101-frequency divider, 102-power divider, 103-first filter, 104-second filter, 200-first frequency mixing unit, 201-first frequency mixer, 202-first amplifier, 300-filter amplifier unit, 301-third filter, 302-second amplifier, 400-frequency doubling filter unit, 401-frequency doubling, 402-fourth filter, 500-second frequency mixing unit, 501-second frequency mixer, 502-third amplifier, 600-RF filter unit, 601-fifth filter. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] like Figure 1 As shown, a double up-conversion method based on a local oscillator source includes a local oscillator frequency division and separation unit 100, a first mixing unit 200, a filtering and amplifying unit 300, a frequency multiplication filtering unit 400, a second mixing unit 500 and a radio frequency filtering unit 600;

[0034] One end of the first frequency mixing unit 200 is used for intermediate frequency input; the other end of the first frequency mixing unit 200 is respectively connected to the local oscillator frequency division and separation unit 100 and the filter amplifier unit 300; one end of the local oscillator frequency division and separation unit 100 is used for local oscillator input; the other end of the local oscillator frequency division and separation unit 100 is also connected to one end of the frequency multiplication filter unit 400; the second frequency mixing unit 500 is respectively connected to the filter amplifier unit 300, the frequency multiplication filter unit 400 and the radio frequency filter unit 600;

[0035] The other end of the RF filter unit 600 is used for RF output.

[0036] In the present invention, the intermediate frequency signal can be effectively converted into the required high-frequency RF signal through two mixing operations, thereby improving the clutter suppression effect of the system. The use of the filter amplifier unit 300 and the RF filter unit 600 helps to remove unnecessary frequency components generated during the mixing process, thereby enhancing the selectivity of the required signal. The multi-stage filtering and mixing process can effectively suppress the clutter signal in the system and improve the clutter suppression effect of the final RF signal.

[0037] In the present invention, through the combination of multiple units, the gain and bandwidth can be adjusted as needed to maintain the integrity of the signal and reduce distortion. The method in the present invention can be applied to the fields of wireless communication, radar, satellite communication, etc., meet the needs of different frequency bands, and has strong practicality.

[0038] Embodiment 2

[0039] like Figure 2As shown, the local oscillator frequency division and separation unit 100 includes a frequency divider 101, a power divider 102, a first filter 103 and a second filter 104; wherein, one end of the frequency divider 101 is used for local oscillator input, the other end of the frequency divider 101 is connected to one end of the power divider 102, and the other end of the power divider 102 is respectively connected to one end of the first filter 103 and the second filter 104; the other end of the first filter 103 is connected to the first mixing unit 200, and the other end of the second filter 104 is connected to the frequency doubling filter unit 400.

[0040] The first frequency mixing unit 200 includes a first amplifier 202 and a first frequency mixer 201; wherein one end of the first frequency mixer 201 is used for intermediate frequency input, and the first frequency mixer 201 is respectively connected to one end of the first amplifier 202 and the filter amplification unit 300;

[0041] The other end of the first amplifier 202 is connected to the first filter 103 of the local oscillator frequency division and separation unit 100 .

[0042] The filtering and amplifying unit 300 includes a third filter 301 and a second amplifier 302; wherein one end of the third filter 301 is connected to the first mixer 201 of the first mixing unit 200, and the other end of the third filter 301 is connected to one end of the second amplifier 302;

[0043] The other end of the second amplifier 302 is connected to the second frequency mixing unit 500 .

[0044] The second frequency mixing unit 500 includes a second frequency mixer 501 and a third amplifier 502; wherein the second frequency mixer 501 is respectively connected to one end of the third amplifier 502, the second amplifier 302 of the filter amplifier unit 300, and the radio frequency filter unit 600;

[0045] The other end of the third amplifier 502 is connected to the frequency doubling filter unit 400 .

[0046] The frequency multiplication filtering unit 400 includes a frequency multiplier 401 and a fourth filter 402; wherein one end of the frequency multiplier 401 is connected to the second filter 104 of the local oscillator frequency division and separation unit 100, and the other end of the frequency multiplier 401 is connected to one end of the fourth filter 402;

[0047] The other end of the fourth filter 402 is connected to the third amplifier 502 of the second frequency mixing unit 500 .

[0048] The radio frequency filtering unit 600 includes a fifth filter 601 ; one end of the fifth filter 601 is connected to the second mixer 501 of the second mixing unit, and the other end of the fifth filter 601 is used for radio frequency output.

[0049] The first amplifier 202 and the third amplifier 502 are driver amplifiers, and the second amplifier 302 is a gain amplifier.

[0050] The signal transmission process of the present invention is as follows: the intermediate frequency signal is transmitted through the first mixing unit 200 and the f LO1 The local oscillator signal of the frequency of / n is first up-converted to generate an intermediate frequency signal which is filtered and amplified by the filter amplifier unit 300 and then mixed with the (n+1)f by the second mixer unit 500. LO1 The local oscillator signal with / n frequency is up-converted for the second time to generate the required RF signal, which is then filtered by the RF filter unit 600 and then output to the outside. Among them, the internal frequency relationship of the product is:

[0051] Intermediate frequency: f IF1 ;

[0052] LO 1 frequency: f LO1 / n;

[0053] IF frequency: f IF1 +f LO1 / n;

[0054] LO 2 frequency: (n+1)f LO1 / n;

[0055] RF frequency: f LO1 -f IF1 .

[0056] The RF frequency (f LO1 -f IF1 ) and f IF1 Directly with f LO1 Mixing frequency generation (f LO1 -f IF1 ) and changes consistently with the local oscillator step.

[0057] The working principle of the present invention to achieve high intermodulation spurious and high local oscillator leakage is:

[0058] 1) If Figure 2 As shown, the intermediate frequency signal f IF1 With f LO1 / n local oscillator signal mixing to generate (f IF1 +f LO1 / n) of an intermediate frequency signal, the intermediate frequency bandwidth is approximately (1 / n)*RF bandwidth. At this time, the filter bandwidth becomes narrower relative to the RF bandwidth, narrowing to one nth of the original RF bandwidth, making f LO1 / n (LO leakage signal) and f LO1 / n+m*f IF1 (Intermediate frequency multiple intermodulation signals) are outside the band of an intermediate frequency filter, and the above stray signals are filtered out by an intermediate frequency filter;

[0059] 2) Then the pure intermediate frequency signal and (n+1)f LO1 / n local oscillator signal mixing to generate (f LO1 -f IF1 ) of the RF signal, although the RF bandwidth does not change, the intermediate frequency signal frequency changes from f IF1 becomes high (f IF1 +f LO1 / n), and the local oscillator frequency is f LO1 becomes high to (n+1)f LO1 / n, thus making (n+1)f LO1 / n local oscillator signal and (n+1)f LO1 / n+m*(f IF1 +f LO1 / n) (intermediate frequency multiple intermodulation signals) are outside the RF filter band and are filtered out by the RF filter.

[0060] This embodiment provides a specific implementation method:

[0061] Taking the example of up-converting a 70MHz intermediate frequency signal to an S-band signal once, the intermediate frequency is 70MHz, the local oscillator frequency is 2270MHz~2470MHz, and the radio frequency frequency is 2200MHz~2400MHz.

[0062] Processing is performed according to the method of the present invention, wherein the frequency division value n is 4;

[0063] IF frequency: 70MHz;

[0064] Local oscillator 1 frequency: 567.5~617.5MHz;

[0065] IF frequency: 637.5~687.5MHz;

[0066] Local oscillator 2 frequency: 2837.5~3087.5MHz;

[0067] RF frequency: 2200MHz~2400MHz.

[0068] The first up-conversion spurious signal frequency calculation is as follows:

[0069] 1st local oscillator signal: 1*f LO1 / 4 =567.5~617.5MHz;

[0070] 1st local oscillator signal and 1st intermediate frequency signal:

[0071] 1*f LO1 / 4 +1*f IF =637.5~687.5MHz;

[0072] 1*f LO1 / 4 -1*f IF =497.5~547.5MHz;

[0073] 1st local oscillator signal and 2nd intermediate frequency signal:

[0074] 1*f LO1 / 4 +2*f IF =707.5~757.5MHz;

[0075] 1*f LO1 / 4 -2*f IF =427.5~477.5MHz;

[0076] 1st local oscillator signal and 3rd intermediate frequency signal:

[0077] 1*f LO1 / 4 +3*f IF =777.5~827.5MHz;

[0078] 1*f LO1 / 4 -3*f IF =427.5~477.5MHz;

[0079] Second local oscillator signal: 2*f LO1 / 4 =1135~1235MHz;

[0080] 2nd local oscillator signal and 1st intermediate frequency signal:

[0081] 2*f LO1 / 4 +1*f IF =1205~1305MHz;

[0082] 2*f LO1 / 4 -1*f IF =1065~1165MHz;

[0083] Secondary local oscillator signal and secondary intermediate frequency signal:

[0084] 2*f LO1 / 4 +2*f IF =1275~1375MHz;

[0085] 2*f LO1 / 4 -2*f IF =995~1095MHz;

[0086] 2nd local oscillator signal and 3rd intermediate frequency signal:

[0087] 2*f LO1 / 4 +3*f IF =1345~1445MHz;

[0088] 2*f LO1 / 4 -3*f IF =925~1025MHz;

[0089] 3rd local oscillator signal: 3*f LO1 / 4 =1702.5~1852.5MHz; 3 local oscillator signals and 1 intermediate frequency signal:

[0090] 3*f LO1 / 4 +1*f IF =1772.5~1922.5MHz;

[0091] 3*f LO1 / 4 -1*f IF =1632.5~1782.5MHz;

[0092] 3rd local oscillator signal and 2nd intermediate frequency signal:

[0093] 3*f LO1 / 4 +2*f IF =1842.5~1992.5MHz;

[0094] 3*f LO1 / 4 -2*f IF =1562.5~1712.5MHz;

[0095] 3rd local oscillator signal and 3rd intermediate frequency signal:

[0096] 3*f LO1 / 4 +3*f IF =1912.5~2062.5MHz;

[0097] 3*f LO1 / 4 -3*f IF =1492.5~1642.5MHz;

[0098] 1st intermediate frequency signal: 1*f IF =70MHz;

[0099] Second intermediate frequency signal: 2*f IF =140MHz;

[0100] 3rd intermediate frequency signal: 2*f IF =210MHz.

[0101] From the above calculation results, we can know that an intermediate frequency passband = f IF +f LO1 / 4 =637.5~687.5MHz, divided by 1*f LO1 / 4 +1*f IFThe useful signal falls into an intermediate frequency band, and the rest of the signals are outside the intermediate frequency band. The spurious signal closer to the passband sideband is 1*f LO1 / 4 (567.5~617.5MHz), 1*f LO1 / 4 +2*f IF (707.5~757.5MHz). Typical indicators are as follows Figure 4 As shown, the spurious suppression of 1*LO and 1*LO+2*IF is 11dBc and 46dBc respectively.

[0102] A typical curve of an intermediate frequency filter is as follows: Figure 5 As shown, the suppression of 1*LO and 1*LO+2*IF is ≥60dBc, that is, the suppression of the 1st local oscillator signal (1*f LO1 / 4 ) Spurious suppression ≥11+60=71dBc, for the 1st local oscillator signal and the 2nd intermediate frequency signal (1*f LO1 / 4 +2*f IF ) Spurious suppression ≥46+60=106dBc, local oscillator leakage suppression and multiple intermodulation spurious suppression with intermediate frequency can achieve ≥70dBc.

[0103] The second up-conversion spurious signal frequency calculation is as follows:

[0104] 1st local oscillator signal: 1*(5 / 4)×f LO1 =2837.5~3087.5MHz;

[0105] 1st local oscillator signal and 1st intermediate frequency signal:

[0106] 1*(5 / 4)×f LO1 +1*(1*f LO1 / 4 +1*f IF )=3475~3775MHz;

[0107] 1*(5 / 4)×f LO1 -1*(1*f LO1 / 4 +1*f IF )=2200~2400MHz;

[0108] 1st local oscillator signal and 2nd intermediate frequency signal:

[0109] 1*(5 / 4)×f LO1 +2*(1*f LO1 / 4 +1*f IF )=4112.5~4462.5MHz;

[0110] 1*(5 / 4)×f LO1 -2*(1*f LO1 / 4 +1*f IF )=1562.5~1712.5MHz;

[0111] 1st local oscillator signal and 3rd intermediate frequency signal:

[0112] 1*(5 / 4)×f LO1 +3*(1*f LO1 / 4 +1*f IF )=4750~5150MHz;

[0113] 1*(5 / 4)×f LO1 -3*(1*f LO1 / 4 +1*f IF )=925~1025MHz;

[0114] 2nd local oscillator signal: 2*(5 / 4)×f LO1 =5675~6175MHz;

[0115] 2nd local oscillator signal and 1st intermediate frequency signal:

[0116] 2*(5 / 4)×f LO1 +1*(1*f LO1 / 4 +1*f IF )=6312.5~6862.5MHz;

[0117] 2*(5 / 4)×f LO1 -1*(1*f LO1 / 4 +1*f IF )=5037.5~5487.5MHz;

[0118] Secondary local oscillator signal and secondary intermediate frequency signal:

[0119] 2*(5 / 4)×f LO1 +2*(1*f LO1 / 4 +1*f IF )=6950~7550MHz;

[0120] 2*(5 / 4)×f LO1 -2*(1*f LO1 / 4 +1*f IF )=4400~4800MHz;

[0121] 2nd local oscillator signal and 3rd intermediate frequency signal:

[0122] 2*(5 / 4)×f LO1 +3*(1*f LO1 / 4 +1*f IF )=7587.5~8237.5MHz;

[0123] 2*(5 / 4)×f LO1 -3*(1*fLO1 / 4 +1*f IF )=3762.5~4112.5MHz;

[0124] 3rd local oscillator signal: 3*(5 / 4)×f LO1 =8512.5~9262.5MHz;

[0125] 3rd local oscillator signal and 1st intermediate frequency signal:

[0126] 3*(5 / 4)×f LO1 +1*(1*f LO1 / 4 +1*f IF )=9150~9950MHz;

[0127] 3*(5 / 4)×f LO1 -1*(1*f LO1 / 4 +1*f IF )=7875~8575MHz;

[0128] 3rd local oscillator signal and 2nd intermediate frequency signal:

[0129] 3*(5 / 4)×f LO1 +2*(1*f LO1 / 4 +1*f IF )=9787.5~10637.5MHz;

[0130] 3*(5 / 4)×f LO1 -2*(1*f LO1 / 4 +1*f IF )=7237.5~7887.5MHz;

[0131] 3rd local oscillator signal and 3rd intermediate frequency signal:

[0132] 3*(5 / 4)×f LO1 +3*(1*f LO1 / 4 +1*f IF )=10425~11325MHz;

[0133] 3*(5 / 4)×f LO1 -3*(1*f LO1 / 4 +1*f IF )=6600~7200MHz;

[0134] 1st intermediate frequency signal: 1*(1*f LO1 / 4 +1*f IF )=637.5~687.5MHz;

[0135] Second intermediate frequency signal: 2*(1*f LO1 / 4 +1*fIF )=1275~1375MHz;

[0136] 3rd intermediate frequency signal: 3*(1*f LO1 / 4 +1*f IF )=1912.5~2062.5MHz;

[0137] From the above calculation results, we can know that RF passband = f LO1 -f IF =2200~2400MHz, except f LO1 -f IF The useful signal falls within the RF band, and the rest of the signals are outside the RF band (such as Figure 6 As shown in the figure), the spurious signal closer to the passband sideband is the 1st local oscillator signal 1*(5 / 4)×f LO1 (2837.5~3087.5MHz), 1st local oscillator signal and 2nd intermediate frequency signal 1*(5 / 4)×f LO1 -2*(1*f LO1 / 4 +1*f IF )(1562.5~1712.5MHz), 3rd intermediate frequency signal 3*(1*f LO1 / 4 +1*f IF )(1562.5~1712.5MHz). Typical indicators are as follows Figure 4 As shown, the spurious suppression for 1*LO, 1*LO-2*IF, and 3*IF are 11dBc, 46dBc, and 65dBc, respectively.

[0138] The RF filter suppresses 1*LO and 1*LO-2*IF3 by ≥55dBc and 3*IF by ≥3dBc, that is, the 1st local oscillator signal (1*(5 / 4)×f LO1 ) Spurious suppression ≥11+55=66dBc, for 1st LO signal and 2nd IF signal (1*(5 / 4)×f LO1 -2*(1*f LO1 / 4 +1*f IF )) Spurious suppression ≥46+55=101dBc, for the 3rd intermediate frequency signal 3*(1*f LO1 / 4 +1*f IF ) Spurious suppression ≥65+3=68dBc, that is, the suppression of local oscillator leakage and multiple intermodulation spurious suppression with the intermediate frequency can achieve ≥65dBc.

[0139] In summary, the 70MHz intermediate frequency signal is up-converted to 2200MHz~2400MHz "once", the worst intermodulation spurious signal is 65dBc, and the worst local oscillator leakage suppression is 65dBc, which can achieve the high spurious suppression index requirements.

[0140] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0141] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double up-conversion method based on a local oscillator source, characterized in that: It comprises a local oscillator frequency division and separation unit (100), a first frequency mixing unit (200), a filter amplification unit (300), a frequency doubling filter unit (400), a second frequency mixing unit (500) and a radio frequency filter unit (600); One end of the first frequency mixing unit (200) is used for intermediate frequency input; the other end of the first frequency mixing unit (200) is respectively connected to the local oscillator frequency division and separation unit (100) and the filter amplifier unit (300); one end of the local oscillator frequency division and separation unit (100) is used for local oscillator input; the other end of the local oscillator frequency division and separation unit (100) is also connected to one end of the frequency doubling filter unit (400); the second frequency mixing unit (500) is respectively connected to the filter amplifier unit (300), the frequency doubling filter unit (400) and the radio frequency filter unit (600); The other end of the radio frequency filtering unit (600) is used for radio frequency output.

2. The method for double up-conversion based on a local oscillator source according to claim 1, characterized in that: The local oscillator frequency division and separation unit (100) comprises a frequency divider (101), a power divider (102), a first filter (103) and a second filter (104); wherein one end of the frequency divider (101) is used for local oscillator input, the other end of the frequency divider (101) is connected to one end of the power divider (102), and the other end of the power divider (102) is respectively connected to one end of the first filter (103) and one end of the second filter (104); the other end of the first filter (103) is connected to the first frequency mixing unit (200), and the other end of the second filter (104) is connected to the frequency doubling filter unit (400).

3. The method for double up-conversion based on a local oscillator source according to claim 2, characterized in that: The first frequency mixing unit (200) comprises a first amplifier (202) and a first frequency mixer (201); wherein one end of the first frequency mixer (201) is used for intermediate frequency input, and the first frequency mixer (201) is respectively connected to one end of the first amplifier (202) and the filtering and amplifying unit (300); The other end of the first amplifier (202) is connected to the first filter (103) of the local oscillator frequency division and separation unit (100).

4. The method for double up-conversion based on a local oscillator source according to claim 3, characterized in that: The filtering and amplifying unit (300) comprises a third filter (301) and a second amplifier (302); wherein one end of the third filter (301) is connected to the first mixer (201) of the first mixing unit (200), and the other end of the third filter (301) is connected to one end of the second amplifier (302); The other end of the second amplifier (302) is connected to the second frequency mixing unit (500).

5. The method for double up-conversion based on a local oscillator source according to claim 4, characterized in that: The second frequency mixing unit (500) comprises a second frequency mixer (501) and a third amplifier (502); wherein the second frequency mixer (501) is respectively connected to one end of the third amplifier (502), the second amplifier (302) of the filter amplifier unit (300), and the radio frequency filter unit (600); The other end of the third amplifier (502) is connected to the frequency doubling filter unit (400).

6. The method for double up-conversion based on a local oscillator source according to claim 5, characterized in that: The frequency multiplication filtering unit (400) comprises a frequency multiplier (401) and a fourth filter (402); wherein one end of the frequency multiplier (401) is connected to the second filter (104) of the local oscillator frequency division and separation unit (100), and the other end of the frequency multiplier (401) is connected to one end of the fourth filter (402); The other end of the fourth filter (402) is connected to the third amplifier (502) of the second frequency mixing unit (500).

7. The method for double up-conversion based on a local oscillator source according to claim 6, characterized in that: The radio frequency filtering unit (600) comprises a fifth filter (601); one end of the fifth filter (601) is connected to the second mixer (501) of the second mixing unit, and the other end of the fifth filter (601) is used for radio frequency output.

8. The method for double up-conversion based on a local oscillator source according to claim 7, characterized in that: The first amplifier (202) and the third amplifier (502) are driver amplifiers, and the second amplifier (302) is a gain amplifier.

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