Broadband preselection frequency conversion SiP based on silicon substrate-rectangular micro coaxial hybrid integration

Abstract

The invention discloses a broadband preselection frequency conversion SiP based on silicon substrate-rectangular micro coaxial hybrid integration, which comprises a first numerical control attenuator, a radio frequency amplifier, a radio frequency filter circuit, a local oscillator frequency multiplier circuit, a first frequency mixer and an intermediate frequency circuit, and is characterized in that the radio frequency filter circuit comprises a radio frequency switch filter bank and a second numerical control attenuator; the radio frequency switch filter bank comprises a switch and a plurality of rectangular micro coaxial band-pass filters, the rectangular micro coaxial band-pass filters and the second numerical control attenuator are mixed and integrated on the silicon-based TSV adapter plate, and the silicon-based SiP sub-module of the radio frequency filter circuit, the first numerical control attenuator, the radio frequency amplifier and the first mixer are packaged into a micro coaxial SiP module by adopting a micro coaxial packaging process. And a local oscillator frequency multiplication circuit silicon-based SiP sub-module and an intermediate frequency circuit silicon-based SiP sub-module are assembled on a broadband preselection frequency conversion SiP mother board. According to the invention, miniaturization can be realized through high-density integration, the flatness and image rejection of the whole receiving link are optimized, and high-performance broadband preselection frequency conversion SiP is realized.

Description

Technical Field

[0001] The present invention belongs to the field of ultra-wideband radio frequency microsystems, and in particular relates to a broadband pre-selected frequency conversion SiP (System in Package) based on silicon-based-rectangular micro-coaxial hybrid integration. Background Art

[0002] In order to meet the high integration and miniaturization requirements of electronic countermeasures, microsystem forms are developed for broadband receiving modules. Currently, there are a variety of receiving module SiP solutions that divide the working frequency band into multiple segments and perform filtering processing in segments. However, due to the objective conditions of high-density integration, limited space and traditional processes limit the flatness, bandwidth, and roll-off of the bandpass filter, and cannot solve the RF flatness fluctuation problem of high-frequency broadband signals, resulting in the deterioration of the performance indicators of the receiving module output signal. Traditional integration forms and R&D models face the challenges of high-density integration and high performance of electronic equipment, and it is difficult to form an effective solution. Summary of the invention

[0003] The purpose of the present invention is to provide a broadband pre-selected frequency conversion SiP based on silicon-based-rectangular micro-coaxial hybrid integration, which can achieve miniaturization through high-density integration while optimizing the flatness and image suppression of the overall receiving link to achieve a high-performance broadband pre-selected frequency conversion SiP.

[0004] In order to achieve the above-mentioned object, one aspect of the present invention provides a broadband preselection frequency conversion SiP based on silicon-rectangular micro-coaxial hybrid integration, comprising a first digitally controlled attenuator, a radio frequency amplifier, a radio frequency filter circuit, a local oscillator frequency multiplication circuit, a first mixer and an intermediate frequency circuit; The first digitally controlled attenuator and the radio frequency amplifier are used to attenuate or amplify the input radio frequency signal according to the dynamic range of the receiver to meet the signal input power requirement of the radio frequency filter circuit; The RF filter circuit includes an RF switch filter group and a second digitally controlled attenuator. The RF switch filter group is used to filter the broadband input RF signal across frequency bands by switch selection, and includes a switch and a plurality of rectangular micro-coaxial bandpass filters. The second digitally controlled attenuator is used to adjust the gain to make the gain of different frequency bands consistent and output the filtered RF signal to the first mixer. The switch, the second digitally controlled attenuator and the plurality of rectangular micro-coaxial bandpass filters are hybrid-integrated on a silicon-based TSV adapter board. A frame is used to isolate each frequency band between the filters to form an independent channel. The local oscillator frequency multiplication circuit is used to obtain a local oscillator signal and output it to the first mixer, and the first mixer is used to perform a down-conversion on the radio frequency signal output by the radio frequency filter circuit and a local oscillator signal output by the local oscillator frequency multiplication circuit, and output an intermediate frequency signal to the intermediate frequency circuit; The intermediate frequency circuit is used to filter and amplify an intermediate frequency signal output by the first mixer, perform secondary down-conversion with two local oscillator signals input externally to generate two intermediate frequency signals, perform low-pass filtering on the two intermediate frequency signals and implement intermediate frequency AGC output power control; The RF filter circuit, the local oscillator frequency doubling circuit, and the intermediate frequency circuit are respectively independently packaged silicon-based SiP sub-modules. The RF filter circuit silicon-based SiP sub-module is packaged into a micro-coaxial SiP module together with the first digitally controlled attenuator, the RF amplifier, and the first mixer using a micro-coaxial packaging process, and is assembled on the motherboard of the broadband pre-selected frequency conversion SiP together with the local oscillator frequency doubling circuit silicon-based SiP sub-module and the intermediate frequency circuit silicon-based SiP sub-module.

[0005] Preferably, the local oscillator frequency multiplication circuit comprises a phase-locked loop, a frequency multiplier, a local oscillator filter, and a local oscillator amplifier; The phase-locked loop is used to convert an externally input reference clock signal into one or more frequency outputs; The frequency multiplier is used to multiply the frequency of the signal output by the phase-locked loop to generate a local oscillation signal; The local oscillator filter is used to perform band-pass filtering on a local oscillator signal generated by frequency multiplication; The local oscillator amplifier is used to amplify the filtered local oscillator signal to a saturation state and output it to the first mixer.

[0006] Preferably, the intermediate frequency circuit includes an intermediate frequency filter, a first amplifier, a second mixer, two local oscillator amplifiers, two intermediate frequency filters, a second amplifier, and a third digitally controlled attenuator. The intermediate frequency filter is used to perform bandpass filtering on an intermediate frequency signal output by the first mixer to suppress harmonics and out-of-band spurious; The first amplifier is used to amplify an intermediate frequency signal output by the intermediate frequency filter, and transmit the amplified signal to the second mixer; The second local oscillator amplifier is used to amplify the second local oscillator signal input externally and transmit it to the second mixer; The second mixer is used for performing secondary down-conversion on an intermediate frequency signal output by the first amplifier and two local oscillator signals output by the two local oscillator amplifiers to generate two intermediate frequency signals; The second intermediate frequency filter is used to perform low-pass filtering on the second intermediate frequency signal output by the second mixer to suppress harmonics and out-of-band spurious; The second amplifier is used to amplify the second intermediate frequency signal output by the second intermediate frequency filter; The third digitally controlled attenuator is used to attenuate and output the second intermediate frequency signal output by the second amplifier.

[0007] According to the above aspects of the present invention, the broadband pre-selected frequency conversion SiP based on silicon-rectangular micro-coaxial hybrid integration realizes miniaturization by utilizing the high-density integration of silicon-based TSV, optimizes the flatness and image suppression of the overall receiving link based on the rectangular micro-coaxial process, and realizes a high-performance broadband pre-selected frequency conversion SiP. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work: Figure 1 It is a structural schematic diagram of a broadband preselected frequency conversion SiP module based on silicon-rectangular micro-coaxial hybrid integration according to an embodiment of the present invention. DETAILED DESCRIPTION

[0009] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. 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.

[0010] The embodiment of the present invention provides a broadband preselected frequency conversion SiP based on silicon-rectangular micro-coaxial hybrid integration. Figure 1 As shown, the broadband preselection frequency conversion SiP of the embodiment of the present invention includes a first digitally controlled attenuator, a radio frequency amplifier, a radio frequency filter circuit, a local oscillator frequency multiplication circuit, a first mixer and an intermediate frequency circuit. The first digitally controlled attenuator and RF amplifier are used to attenuate or amplify the input RF signal according to the dynamic range of the receiver to meet the signal input power requirement of the RF filter circuit. After the input RF signal is controlled by the first digitally controlled attenuator and RF amplifier through RF ACG (Automatic Gain Control), it enters the RF filter circuit as a small signal below -30dB.

[0011] The RF filter circuit includes an RF switch filter group and a second digitally controlled attenuator. The RF switch filter group performs frequency band filtering on the input cross-band RF signal through switch selection to complete the bandpass filtering of the broadband signal. Each frequency band has a corresponding channel, which is conducive to improving the image suppression of the receiving link. The RF switch filter group includes two switches (a first switch and a second switch) and a plurality of rectangular micro-coaxial bandpass filters (micro-coaxial bandpass filter 1, ..., micro-coaxial bandpass filter n). The switch and the rectangular micro-coaxial bandpass filter can be used in combination according to actual needs, as long as the frequency band bandpass filtering can be achieved. The rectangular micro-coaxial broadband filter is used, and its high out-of-band suppression is conducive to improving the image suppression, which can meet the broadband high image suppression requirements of the frequency conversion module. The second digitally controlled attenuator adjusts the switch filter link insertion loss of the corresponding channels of different frequency bands to be consistent, so that the gain of different frequency bands is consistent, the flatness of the filtered RF signal is increased, and it is output to the first mixer.

[0012] The RF switch filter group is a hybrid integrated silicon-based TSV adapter board and rectangular micro-coaxial filter. The rectangular micro-coaxial bandpass filter manufactured using the rectangular micro-coaxial process is hybrid integrated with the switch, the second digitally controlled attenuator and other bare chips (DIE) on the silicon-based TSV (Through-Silicon Via) adapter board. The filters are isolated by a frame to form an independent channel for each frequency band. The low insertion loss, high flatness and high isolation of the rectangular micro-coaxial are used to achieve ultra-high out-of-band suppression, and at the same time meet the broadband high image suppression requirements of the frequency conversion module.

[0013] The rectangular micro-coaxial process has low dispersion characteristics, achieving multi-band (Ka-V band) RF small signal anti-aliasing filtering while maintaining extremely low insertion loss, which is beneficial to improving the flatness within the broadband reception band; since the multiple rectangular micro-coaxial filters corresponding to different frequency bands have differences in insertion loss, the second digitally controlled attenuator is used to compensate for the consistency of insertion loss between bandpass filters in different frequency bands, thereby improving the flatness of the output RF signal.

[0014] The RF filter circuit, local oscillator frequency doubling circuit, and intermediate frequency circuit are independently packaged silicon-based SiP sub-modules, which are conducive to shielding interference, improving signal isolation, and optimizing spurious performance.

[0015] The RF filter circuit silicon-based SiP submodule is packaged into a micro-coaxial SiP module with the first digitally controlled attenuator, the RF amplifier and the first mixer using a micro-coaxial packaging process, and is assembled on the motherboard of the broadband pre-selected frequency conversion SiP with the local oscillator frequency multiplication circuit and the intermediate frequency circuit silicon-based SiP submodule.

[0016] The local oscillator frequency multiplication circuit is used to implement a local oscillator signal frequency sweeping of an externally input 100M reference signal through a phase-locked loop (PLL) and a frequency multiplier, and then filter and amplify the local oscillator signal through a local oscillator filter and a local oscillator amplifier to obtain a local oscillator signal Lo1 which is output to the first mixer.

[0017] Specifically, a local oscillator frequency multiplication circuit includes a phase-locked loop (PLL), a frequency multiplier, a local oscillator filter, and a local oscillator amplifier. The phase-locked loop is used to convert the 100M reference clock signal input from the broadband pre-selected frequency conversion SiP to one or more frequency outputs through phase detection, loop filtering, VCO tuning and other steps; the frequency multiplier is used to multiply the signal output from the phase-locked loop to generate a local oscillator signal; the local oscillator filter is used to perform bandpass filtering on the local oscillator signal generated by the frequency multiplication to filter out high-order harmonics and 1 / 2 harmonics; the local oscillator amplifier is used to amplify the local oscillator signal filtered by the local oscillator filter to a saturated state, and output the amplified local oscillator signal Lo1 to the first mixer to enable it to work normally.

[0018] The first mixer is used to down-convert the radio frequency signal output by the radio frequency filter circuit and the local oscillator signal output by the local oscillator frequency multiplication circuit, output an intermediate frequency signal IF1 to the intermediate frequency circuit, and suppress third-order intermodulation.

[0019] The intermediate frequency circuit is used to filter and amplify an intermediate frequency signal output by the first mixer, and perform secondary down-conversion with two local oscillator signals input externally to generate two intermediate frequency signals, perform low-pass filtering on the two intermediate frequency signals and realize intermediate frequency AGC output power control.

[0020] Specifically, the intermediate frequency circuit includes an intermediate frequency filter, a first amplifier, a second mixer, two local oscillator amplifiers, two intermediate frequency filters, a second amplifier, and a third digitally controlled attenuator. An intermediate frequency filter is used to perform bandpass filtering on an intermediate frequency signal IF1 output by the first mixer to suppress harmonics and out-of-band spurious; a first amplifier is used to amplify a filtered intermediate frequency signal output by an intermediate frequency filter and transmit it to a second mixer; a second local oscillator amplifier is used to amplify a second local oscillator signal Lo1 externally input by the broadband preselected frequency conversion SiP and transmit it to a second mixer; the second mixer is used to perform secondary down-conversion on an intermediate frequency signal output by the first amplifier and two local oscillator signals output by the second local oscillator amplifier to generate two intermediate frequency signals; the second intermediate frequency filter is used to perform low-pass filtering on the two intermediate frequency signals output by the second mixer to suppress harmonics and out-of-band spurious; the second amplifier is used to amplify the filtered two intermediate frequency signals output by the two intermediate frequency filters; a third digitally controlled attenuator is used to attenuate the two intermediate frequency signals output by the second amplifier, and together with the second amplifier, realize intermediate frequency AGC output power control to output two intermediate frequency signals IF2.

[0021] In summary, the broadband pre-selected frequency conversion SiP of the embodiment of the present invention adopts a RF switch filter group integrated with a silicon-based TSV adapter board, wherein the ultra-wideband bandpass filter adopts a rectangular micro-coaxial process, and the rectangular micro-coaxial structure has low dispersion characteristics, which can solve the problems of the transmission line in the traditional frequency conversion module being greatly affected by the dispersion effect, high insertion loss, deterioration of the noise coefficient and the flatness of the intermediate frequency inner band in the high-frequency broadband situation. The ultra-high out-of-band suppression of the rectangular micro-coaxial bandpass filter can meet the broadband high image suppression requirements of the frequency conversion module. The bare chips such as switches and digital attenuators are mixed and integrated with multiple micro-coaxial bandpass filters on the silicon-based TSV adapter board, and each frequency band is isolated by a frame to form a corresponding channel, which is conducive to improving the image suppression of the receiving link. In addition, the RF, local oscillator, and intermediate frequency circuits are each integrated into an independent single sub-SiP module, which is conducive to improving the isolation between signals of different frequencies. The broadband pre-selected frequency conversion SiP of the embodiment of the present invention is based on the fusion of silicon-based TSV and micro-coaxial processes to realize an ultra-wideband millimeter-wave high-performance frequency conversion module, which has obvious significance for improving the future electronic countermeasure capability.

[0022] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A broadband preselection frequency conversion SiP based on silicon-rectangular micro-coaxial hybrid integration, characterized in that: It includes a first digitally controlled attenuator, a radio frequency amplifier, a radio frequency filter circuit, a local oscillator frequency multiplication circuit, a first mixer and an intermediate frequency circuit; The first digitally controlled attenuator and the radio frequency amplifier are used to attenuate or amplify the input radio frequency signal according to the dynamic range of the receiver to meet the signal input power requirement of the radio frequency filter circuit; The RF filter circuit includes an RF switch filter group and a second digitally controlled attenuator. The RF switch filter group is used to filter the broadband input RF signal across frequency bands by switch selection, and includes a switch and a plurality of rectangular micro-coaxial bandpass filters. The second digitally controlled attenuator is used to adjust the gain to make the gain of different frequency bands consistent and output the filtered RF signal to the first mixer. The switch, the second digitally controlled attenuator and the plurality of rectangular micro-coaxial bandpass filters are hybrid-integrated on a silicon-based TSV adapter board. A frame is used to isolate each frequency band between the filters to form an independent channel. The local oscillator frequency multiplication circuit is used to obtain a local oscillator signal and output it to the first mixer, and the first mixer is used to perform a down-conversion on the radio frequency signal output by the radio frequency filter circuit and a local oscillator signal output by the local oscillator frequency multiplication circuit, and output an intermediate frequency signal to the intermediate frequency circuit; The intermediate frequency circuit is used to filter and amplify an intermediate frequency signal output by the first mixer, perform secondary down-conversion with two local oscillator signals input externally to generate two intermediate frequency signals, perform low-pass filtering on the two intermediate frequency signals and implement intermediate frequency AGC output power control; The RF filter circuit, the local oscillator frequency doubling circuit, and the intermediate frequency circuit are respectively independently packaged silicon-based SiP sub-modules. The RF filter circuit silicon-based SiP sub-module is packaged into a micro-coaxial SiP module together with the first digitally controlled attenuator, the RF amplifier, and the first mixer using a micro-coaxial packaging process, and is assembled on the motherboard of the broadband pre-selected frequency conversion SiP together with the local oscillator frequency doubling circuit silicon-based SiP sub-module and the intermediate frequency circuit silicon-based SiP sub-module.

2. The broadband preselection frequency conversion SiP as claimed in claim 1, characterized in that: The local oscillator frequency multiplication circuit comprises a phase-locked loop, a frequency multiplier, a local oscillator filter, and a local oscillator amplifier; The phase-locked loop is used to convert an externally input reference clock signal into one or more frequency outputs; The frequency multiplier is used to multiply the frequency of the signal output by the phase-locked loop to generate a local oscillation signal; The local oscillator filter is used to perform band-pass filtering on a local oscillator signal generated by frequency multiplication; The local oscillator amplifier is used to amplify the filtered local oscillator signal to a saturation state and output it to the first mixer.

3. The broadband preselection frequency conversion SiP according to claim 1 or 2, characterized in that: The intermediate frequency circuit includes an intermediate frequency filter, a first amplifier, a second mixer, two local oscillator amplifiers, two intermediate frequency filters, a second amplifier, and a third digitally controlled attenuator. The intermediate frequency filter is used to perform bandpass filtering on an intermediate frequency signal output by the first mixer to suppress harmonics and out-of-band spurious; The first amplifier is used to amplify an intermediate frequency signal output by the intermediate frequency filter, and transmit the amplified signal to the second mixer; The second local oscillator amplifier is used to amplify the second local oscillator signal input externally and transmit it to the second mixer; The second mixer is used for performing secondary down-conversion on an intermediate frequency signal output by the first amplifier and two local oscillator signals output by the two local oscillator amplifiers to generate two intermediate frequency signals; The second intermediate frequency filter is used to perform low-pass filtering on the second intermediate frequency signal output by the second mixer to suppress harmonics and out-of-band spurious; The second amplifier is used to amplify the second intermediate frequency signal output by the second intermediate frequency filter; The third digitally controlled attenuator is used to attenuate and output the second intermediate frequency signal output by the second amplifier.

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