Lub luag haujlwm tseem ceeb thiab qhov chaw ntawm down -conversion mixer
Lub down -conversion mixer yog ib tug core nonlinear zaus- hloov dua siab tshiab nyob rau hauv RF receiver systems. Nws lub luag haujlwm tseem ceeb yog ua kom tsis muaj kev sib xyaw ntawm qhov siab -frequency RF teeb liab tau txais los ntawm tus kav hlau txais xov thiab lub hauv paus oscillator (LO) teeb liab, tso tawm cov teeb liab nruab nrab zaus (IF) ntawm qhov qis dua. Cov txheej txheem no nteg lub hauv paus rau tom ntej teeb liab lim, amplification, thiab demodulation, ua lub tov khoom ib indispensable unit nyob rau hauv superheterodyne receiver architectures.
Cov ntsuas kev ua tau zoo tseem ceeb thiab kev siv cov qauv tsim ntawm down- hloov cov khoom sib xyaw
Raws li lub hauv paus tseem ceeb ntawm cov saw saw, ntau qhov kev ua tau zoo tseem ceeb ntawm qhov down - hloov khoom sib tov ncaj qha txiav txim siab tag nrho cov kev ua tau zoo ntawm lub receiver system: Ua ntej yog hloov dua siab tshiab nce - qhov piv ntawm cov zis IF teeb liab fais fab rau input RF teeb liab fais fab - uas tuaj yeem categorized rau hauv conversion voltage nce thiab conversion zog nce; Kev nce qib siab txo qis qhov cuam tshuam ntawm lub suab nrov los ntawm backend circuitry ntawm lub kaw lus tag nrho cov teeb liab - rau - suab nrov piv (SNR), yog li pab txhim kho cov neeg txais kev xav. Qhov thib ob yog lub suab nrov, ib qho kev ntsuas ntawm lub suab nrov ntxiv qhia thaum lub sij hawm sib tov; ib lub suab nrov qis dua khaws cia SNR ntawm cov teeb liab tsis muaj zog, uas yog qhov tseem ceeb rau qhov tsawg - suab nrov txais tos. Qhov thib peb yog kev rho tawm, xa mus rau lub peev xwm los tiv thaiv cov teeb liab tawm ntawm cov chaw nres nkoj- tshwj xeeb yog kev cais tawm ntawm LO chaw nres nkoj mus rau RF chaw nres nkoj thiab los ntawm LO chaw nres nkoj mus rau IF chaw nres nkoj; Kev sib cais tsis txaus tso cai rau LO teeb liab xau los cuam tshuam nrog lub teeb liab tau txais, uas ua rau muaj kev sib haum xeeb hauv backend circuits lossis cuam tshuam nrog lwm cov kev sib txuas lus. Plaub yog linearity, feem ntau yog tus cwj pwm los ntawm 1-dB compression point thiab qhov thib peb-order intercept point (IP3), uas qhia txog lub tshuab tov lub peev xwm los tswj cov teeb liab loj yam tsis muaj kev cuam tshuam loj heev; siab dua linearity tiv thaiv intermodulation distortion tshwm sim los ntawm muaj zog cuam tshuam los ntawm thaiv qhov tau txais channel, yog li txhim kho cov kab ke cuam tshuam kev tiv thaiv. Qhov thib tsib yog qhov sawv yoj piv (SWR), uas qhia txog qhov cuam tshuam ntawm qhov sib xyaw ntawm cov khoom nkag / tso tawm cov chaw nres nkoj thiab cov kab sib kis; Kev sib piv zoo dua ua rau txo qis kev xav tsis zoo thiab kev siv hluav taws xob ntau dua. Nyob rau hauv cov nqe lus ntawm kev siv architecture, feem ntau down{18}}hloov mixers poob rau hauv ob pawg loj: passive mixers thiab active mixers. Passive mixers feem ntau yog tsim los siv diodes, diode txuas hniav, los yog hloov MOSFET arrays; lawv cia siab rau qhov tsis muaj qhov tsis sib xws ntawm cov khoom siv los ua qhov sib xyaw ua ke yam tsis tas yuav tsum muaj lub zog DC sab nraud. Thaum lawv muab cov txiaj ntsig zoo xws li kev siv dav dav, tsis tshua muaj suab nrov, thiab kev ua haujlwm siab zaus, lawv raug kev txom nyem los ntawm kev hloov pauv hloov pauv - xav tau lub tshuab hluav taws xob txuas ntxiv los them rau kev txo hwj chim - thiab feem ntau siv hauv cov ntawv thov xws li siab - zaus microwave txais thiab kev sib txuas lus broadband. Active mixers, conversely, siv transistors muab nce; lawv muab cov kev hloov pauv tau zoo uas tuaj yeem cuam tshuam lub suab nrov los ntawm kev xa hluav taws xob hauv hluav taws xob, thaum tseem xa cov chaw nres nkoj zoo dua thiab kev sib koom ua ke ntau dua, ua rau lawv zoo tagnrho rau monolithic RF transceiver chips fabricated siv CMOS txheej txheem. Lawv qhov tsis zoo suav nrog qhov qis qis qis dua piv rau cov khoom sib xyaw ua ke thiab qee qhov kev ua haujlwm tsis zoo ntawm lub suab nrov.
Cov xwm txheej siv tau zoo thiab cov qauv kev txhim kho ntawm down- hloov khoom sib tov
Hauv kev siv cov tswv yim, nqes - hloov pauv cov khoom sib xyaw yog muaj nyob rau hauv cov teb uas xav tau RF teeb liab txais. Hauv kev sib txuas lus wireless-xws li los ntawm 5G hauv paus chaw nres tsheb thiab smartphones mus rau Wi-Fi thiab Bluetooth cov khoom siv- cov khoom siv tau txais cov saw txuas rau cov khoom sib xyaw no los hloov siab - cov teeb liab xaim zaus mus rau hauv nruab nrab zaus (IF) lossis cov teeb liab baseband haum rau kev ua haujlwm. Hauv radar thiab hluav taws xob ua tsov rog systems, wideband down -conversion mixers converts detection and reconnaissance signals from various frequency bands into a unified IF, enabling the monitoring and analysis of wideband signals. Ib yam li ntawd, hauv kev tshaj tawm xov tooj cua txais xov tooj cua thiab satellite navigation / positioning systems, down{10}}conversion mixers ua hauj lwm tseem ceeb rau cov teeb liab down{11}} hloov dua siab tshiab, pab txhawb kev demodulation tom qab thiab decoding. Raws li kev sib txuas lus thev naus laus zis tau nce mus rau ntau zaus bands thiab kev sib koom ua ke ntau dua, nqes - kev hloov pauv hloov pauv hloov mus tas li kom dhau los ua qhov dav dua -band, compact dua, thiab tus yam ntxwv los ntawm kev siv hluav taws xob tsawg thiab siab linearity, yog li ua tau raws li daim ntawv thov xav tau ntawm - tiam wireless systems.
Cov qauv tshwj xeeb ntawm down - hloov khoom sib tov
Lub TRF37x32 yog qhov dav dav, dual-channel down- hloov khoom siv nrog kev sib xyaw IF amplifiers. Cov cuab yeej siv cov baluns sib xyaw ua ke rau ib zaug - xaus RF thiab LO inputs. Kev khiav hauj lwm hauv qhov qhib -collector topology, IF amplifiers ua haujlwm nyob rau hauv 30 MHz txog 600 MHz ntau yam, txhawb ntau yam IF zaus thiab bandwidths. TRF37x32 muab cov khoom sib xyaw ua ke zoo tshaj plaws thiab lub suab nrov ua haujlwm, nrog rau cov channel muaj zog - mus rau - channel cais, ua rau nws tsim nyog rau ntau yam kev siv. Ntxiv rau nws qhov qis- qauv tsim hluav taws xob, lub cuab yeej muaj qhov qis- lub zog hom kev xaiv rau lub zog- cov ntawv thov nkag siab. Txhua lub channel tuaj yeem ua haujlwm ntawm nws tus kheej nrog lub sijhawm teb sai, ua rau lub cuab yeej zoo tagnrho rau Time Division Duplex (TDD) daim ntawv thov.
Down - hloov pauv cov khoom sib xyaw
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Tus naj npawb ntawm cov channel |
2 |
|
RF zaus (min) (MHz) |
400 |
|
RF zaus (max) (MHz) |
1700 |
|
IF zaus (min) (MHz) |
30 |
|
IF zaus (max) (MHz) |
600 |
|
Conversion nce (typ) (dB) |
9.6 |
|
Lub suab nrov (typ) (dB) |
9.6 |
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IIP3 (typ) (dBm) |
26 |
|
OIP3 (typ) (dBm) |
35.6 |
|
OIP2 (typ) (dBm) |
65 |
|
IP1dB (typ) (dBm) |
11 |
|
Integrated VCO |
Tsis muaj |
|
LO input theem (typ) (dBm) |
0 |
|
LO input zaus (min) (MHz) |
600 |
|
LO input zaus (max) (MHz) |
1400 |
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Kev siv tam sim no (mA) |
280 |
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Kev siv fais fab (typ) (mW) |
920 |
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Fais fab - down tam sim no |
Yog lawm |
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Kev khiav hauj lwm qhov kub thiab txias (degree) |
-40 rau 85 |
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Kev ntsuas |
Catalog |
Cim npe nrov: Tuam Tshoj downconverting mixers manufacturers, lwm tus neeg
