Yuav ua li cas thiaj zoo rau lub capinitators tsis ntawm diodes hauv kev sib txuas lus rf?

1, tsom xam ntawm diod Chargracitance cov yam ntxwv
(1) Capacitor muaj pes tsawg leeg thiab cov lus teb ntau
The capacitance of a diode is composed of barrier capacitance (CB) and diffusion capacitance (CD). When conducting forward, CD dominates and its value increases with the increase of current; When the reverse cutoff occurs, CB dominates. In high-frequency scenarios, the equivalent capacitance of the diode can reach 5-15pF (frequency>100MHz), uas yuav ua rau tsis ua tiav ntawm RF module. Piv txwv li, lub PA module ntawm ib qho chaw nres tsheb 5g tau muaj kev ua tau zoo tshaj plaws 2.3 txo qis hauv kev ua haujlwm ntawm kev ua tau zoo kawg nkaus. Tom qab ua kom zoo dua ntawm cov tsis muaj peev xwm, kev ua tau zoo tau rov qab los.
(2) Cov yam ntxwv ntawm Cov Kwvhiaj Diode
Lub peev xwm capacitance muaj txiaj ntsig ntawm cov kwv tij Diode sib txawv nrog cov rov qab voltage (c} v) tus cwj pwm nkhaus txiav txim siab qhov ntau thiab licinity. Qhov kev muaj peev xwm hluav taws xob piv ntawm ib qho phem diode yog 2 - 20. Piv txwv li, thaum thim rov qab voltage ntawm qee tus qauv hloov los ntawm -2V, lub voltorance piv tau ntev li 6. Piv txwv li, rau zaus hauv qab 600MHz, nruab nrab Q-tus qauv qauv xws li bby52 yog nyiam tshaj plaws ntawm 1-6ghz, SHR1405 thiab MA46H series tau txiav txim siab.
(3) tus yam ntxwv ntawm PIN diode
Thaum tus pin di diod yog tom ntej kev sib cav, tus cab kuj siab rau hauv kuv txheej nce thiab cov tsis kam txo; Thaum thim rov qab los, qhov tsis kam ntawm kuv txheej nce, ua rau muaj kev cuam tshuam siab. Nws cov yam ntxwv hluav taws xob tau cuam tshuam nrog qhov kuv - txheej txheej dav thiab tsis muaj tseeb. Piv txwv li, tus lej PIN diode muaj lub capacitance ntawm 0.5pf ntawm xoom kev tsis sib haum, thiab thaum thim rov qab voltage nce mus rau -10V, qhov kev muaj peev xwm hluav taws xob poob qis rau 0.2pf. Hauv RF hloov tsim, tus Pin tsim nyog yuav tsum tau xaiv raws li kev hloov tsheb khiav ceev thiab kev rho tawm.
2, txoj kev ua kom zoo rau capacitics tsis
(1) tivthaiv xaiv kev ua kom zoo dua
Cov kev siv siab siab: schottky diodes tau nyiam rau RF cov kev sib txuas, nrog CB tsawg li 0.5pf thiab hloov nrawm mus txog nanoseconds. Piv txwv li, lub xov tooj ntawm tes kav hlau txais xov siv cov schottky diodes kom ua tiav cov txheej txheem siab ntawm- zaus cov cim.
Kev tswj hwm tswj hwm: zaus tab tom tiav yog ua tiav siv cov neeg sib tw ua haujlwm npau suav. Piv txwv li, cov khoom siv chaw nres tsheb hauv chaw nres tsheb nres tsheb sib txawv nrog lub peev xwm ntawm 1000
Kev kub siab ib puag ncig: xaiv Ultra -} qis series tiv thaiv (0.4 ω) thiab siv tej yam me me 0402 ntim cov tshuaj me me. Piv txwv li, kev sib txuas lus satellite siv cov diodes zoo li no, uas tseem muaj qhov siab ntawm 500 ntawm 2GHz, haum rau ib qho siab thiab siab} dej txias ib puag ncig.
(2) Circuit Court tsim kho kom tau zoo
Series capacitor tsim: Hauv cov kuj muaj peev xwm ua kom tau zoo teev cia ua ke, series capacitors tuaj yeem txo peev xwm siv tau zoo thiab txhim kho txoj kev raug. Piv txwv li, nyob rau hauv qee yam VCO Circuita, A 22PFF Capacitor tau txuas nrog qhov tseeb ntawm cov kev cai ntawm kev tswj cov kev cai.
Rov qab rau rov qab kev twb kev txuas: ob lub voos voos txaij Piv txwv li, lub ntsej muag hluav taws xob wireless siv txoj kev sib txuas no, uas nce qhov muaj peev xwm ua rau muaj kev nyab xeeb ntawm lwm qhov DIODE, khaws cia kom tag nrho cov kev sib cav sib ceg.
Segmented Tuning: Ntu tswj ntawm cov zaus ntau yog tiav los ntawm kev hloov pauv doneses, txo qhov sib haum ntawm cov qij taws. Piv txwv li, 40-70MHz voltage tswj hwm oscillation hloov kho txoj kev ua tiav kev ntxhib thiab zoo zaus thiab cov zaus thiab cov zaus zaus.
(3) nyiaj kho qhov ntsuas kub
Cov nyiaj them nqi xaiv: Xaiv cov sib txawv txav tau Diode nrog ua - qhov ntsuas kub, uas nws lub peev xwm hloov tau qhov ntsuas kub thiab txias.
Cov neeg mob ncig ua haujlwm: Kev them nyiaj them rau siv NTC cov cua nab kuab, uas kho cov bias voltage raws li qhov ntsuas kub hloov pauv kom muaj peev xwm tswj hwm kom muaj peev xwm ruaj khov. Piv txwv li, qee qhov chaw radar siv cov qauv no kom ua kom lub capacitics hloov pauv tsawg dua 5% nyob rau hauv thaj tsam ntawm ntau -40 Qib rau 85 degree.
3, ntim khoom thiab txheej txheem txiav txim siab
(1) Kev Xaiv Ntim
Tsawg parasitic tsis: sot {{5} muab tshuaj rau hauv cov roj 30% Piv txwv li, qhov ntau zaus ntawm cov hluav taws xob siv cov phom loj
Miniaturization: 0402 ntim tau haum rau high- zaus thiab siab} dej ua haujlwm ib puag ncig. Piv txwv li, ib millimeter txaus tshuaj radar system siv 0402 ntim cov volactor diodes kom tau raws li chaw thiab kev ua tau zoo.
(2) pcb teeb tsa zoo
Kev sibxeeb ntawm: qhov kev ncua deb ntawm kev sib nrug ntawm thiab tus lej PIN yuav tsum tsis pub tshaj 0.3 hli yuav tsum txo cov kev quab yuam hauv av. Piv txwv li, lub PA module ntawm qee qhov chaw nres tsheb 5G tau txhim kho cov evm index los ntawm kev ua kom zoo ntawm kev ua haujlwm ntawm cov av vias.
Txoj kev cuam tshuam: Tswj cov kev coj ua ntawm tus tswj txoj kev tswj hwm kom muaj 50 ω, txo cov paib. Piv txwv li, ib qho RF Circuit Court siv cov kab microstrip nrog 50 ω Kev tswj kev tsis taus, uas txhim kho cov cim qhia ncaj ncees.
Kev tiv thaiv thiab kev sib cais: Cov thaiv cov pob zeb hauv av thiab phiaj phiaj paj vias yog siv los txo cov hluav taws xob hluav taws xob. Piv txwv li, lub tshuab hluav taws xob wireless ntawm qee lub xov tooj ntawm tes tau los txhim kho qhov tseeb ntawm kev hloov kho kev hloov kho.
4, kuaj qhov siv tau thiab ntsuas qhov kev siv tau
(1) Lub peev xwm ntsuas hluav taws xob kuaj
Vector Network Analyer: Siv tus kws tshaj lij Vector networker los ntsuas cov s qhov tsis zoo ntawm diodees thiab tau txais qhov tseeb capital thiab tau muaj nuj nqis. Piv txwv li, qee qhov kev xaiv cov khoom xaiv txawm hais tias lub peev xwm capens thiab q tus nqi ntawm cov qauv tsim raws cov kev cai yuav tsum tau ua los ntawm kev ntsuas cov s parameter.
Kuaj Kub: Kuaj qhov ntsuas kub nyob hauv cov capacitor nyob rau hauv thaj tsam ntawm ntau -40 txog rau 125℃kom ntseeg tau tias nws tseem ua haujlwm tau ib txwm muaj nyob hauv ib puag ncig. Piv txwv li, qee cov khoom siv cuam tshuam rau kev txheeb xyuas seb qhov ntsuas hluav taws xob hloov kho ntawm cov khoom siv tau pub dawb.
(2) Circuit Court kev ua tau
Kev ntsuas kev txheeb xyuas qhov tseeb: Tshawb xyuas seb puas qhov kev ntsuas ntau ntawm cov qauv sib tw ua tau raws cov qauv kev yuav tsum muaj los ntawm kev ntsuas Circuit Court. Piv txwv li, qee qhov chaw VCO hais txog seb nws cov kev ntsuas ntau zaus npog Band los ntawm kev kho qhov tsis ncaj ncees.
Suab nrov thiab cov lus qhia tsis sib xws: ntsuas cov sij hawm ua suab nrov ntawm cov chaw ua kom paub tseeb ntawm daim dikas tsis qhia lub suab nrov ntxiv lossis distortion. Piv txwv li, qee qhov kev ntsuas hluav taws xob qee yam seb puas muaj peev xwm ua tau zoo ntawm cov kab mob sib txawv ntawm cov dej num theem.
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