Kulesi sihloko, siqhathanisa izikhulisamazwi zamanje nama-amplifiers ahlukene, sihlaziya izakhiwo zazo, izici zokusebenza, kanye nokwehluka kwezinhlelo zokusebenza. Izinzuzo zama-amplifiers zamanje ku-bandwidth, isilinganiso sokwenqatshwa kwemodi evamile (CMRR), kanye nezinhlelo zokusebenza zamafrikhwensi aphezulu ziyagqanyiswa.

Umehluko Wezakhiwo Phakathi Kwama-Amplifaya Amanje Azwakalayo kanye Nezikhulisamazwi Ezihlukile

Ngokungafani nama-amplifiers ahlukanisayo, athembele kumanethiwekhi okumelana nokokufaka ukuze anciphise amandla okufakwayo, izikhulisamazwi zamanje ngokuvamile zisebenzisa ukwakheka okuhlukile. Basebenzisa ama-transistors anamandla kagesi aphezulu ukuphatha ngokuqondile ama-voltages emodi evamile ashintshashintsha ngokushesha kuyilapho bekhulisa ngokunembile ama-shunt voltages amancane (Umfanekiso 1).

Umfanekiso 1. Isibonelo Sesikhulisi Sense Yamanje

Kuma-amplifiers ahlukene, isignali yokuhlukanisa okokufaka kuqala incishiswe inethiwekhi ephikisayo, bese ikhuliswa ibuyele kuleveli yokufaka yasekuqaleni ngenzuzo eyengeziwe ukuze kuzuzwe ukukhulisa isignali kokugcina ekuphumeni. Ukubuyisela okokufaka okuncishisiwe ku-amplitude yesignali yayo yoqobo kudla ingxenye yomkhiqizo wokuzuza umkhawulokudonsa wesikhulisi sangaphakathi, kudela umkhawulokudonsa ukuze kuzuzwe inzuzo eyengeziwe.

Ngokuphambene, izikhulisa-zwi zamanje aziwanciphisi amasiginali ngenxa yama-transistors awo wokufaka we-voltage ephezulu, asusa isidingo senzuzo eyengeziwe yokubuyisela ubude besignali. Lokhu kuvumela i-op-amp yangaphakathi ukuthi igcine umkhawulokudonsa owengeziwe wokukhulisa isignali.

Izinzuzo Zokusebenza Zezikhulisamazwi Zamanje Zenzwa

I-Bandwidth Advantage: Isibonelo, i-AD8206 yokuhlukanisa isikhulisi sinesignali encane -3dB yomkhawulokudonsa ongu-100 kHz, kuyilapho isikhulisi senzwa samanje se-AD8210 sinikeza umkhawulokudonsa ongu-450 kHz. Umkhawulokudonsa okhuphukile wezikhulisi zezinzwa zamanje zizenza zilungele izinhlelo zokusebenza zemvamisa ephezulu noma izimo ezidinga ukutholwa kwezinto ezidlulayo zamanje ezisheshayo.

I-High Common-Mode Rejection Ratio (CMRR): Izikhulisamazwi zamanje ngokuvamile zibonisa i-CMRR ephakeme, ngokuvamile ebangeni lika-100 dB kuya ku-120 dB noma ngaphezulu, kuyilapho izikhulisamsindo eziningi ezihlukene zine-CMRR ephakathi kuka-80 dB no-100 dB.

I-Common-Mode Voltage Range: I-trade-off yomkhawulokudonsa omkhulu wezikhulisi zenzwa zamanje ukungabikho kwamanethiwekhi angaphakathi okunciphisa. Lokhu kunciphisa amandla abo okwamukela ama-voltage aphezulu kakhulu wokufaka wemodi evamile uma kuqhathaniswa nama-amplifiers ahlukene. Kodwa-ke, ama-amplifiers amanje asasekela ububanzi bamandla kagesi wemodi evamile, ngokuvamile phakathi kuka-80 V no-100 V.

Izinzuzo Zezikhuliseli Zenzwa Zamanje Ezilinganisweni Zamanje Ezishintshayo

Ama-amplifiers amanje asetshenziswa kakhulu ukukala ama-switching currents amakhulu. Lapho kulinganiswa la maza omoya ohlangothini oluphezulu lomthwalo, amandla kagesi emodi evamile ku-shunt resistor angase aguqe ngokushesha phakathi kwezinga eliphansi kanye ne-voltage yokuhlinzeka.

Lezi zinguquko ezisheshayo zingadala izinguquko ezibalulekile ekufakweni kwe-amplifier. Kwezinye izimo, ama-voltage emodi evamile angadlula i-amplitude yesiginali ngokwayo. Ngokufanelekile, i-amplifier kufanele ikhiqize kuphela okukhiphayo okubonisa i-voltage yenzwa ehlukanisiwe ekhulisiwe. Nokho, ezinhlelweni zokusebenza, okukhiphayo kungase kubonise impendulo yesinyathelo semodi evamile.

Ama-amplifiers amanje ahamba phambili ekucindezeleni ama-spikes esikhashana emodi evamile ebangelwa izinyathelo zamandla kagesi emodi evamile eshintsha ngokushesha, okuwenza afanelekele izinhlelo zokusebenza zamanje zokuzwa ezinama-amplitude ahluka ngokushesha.

Ukusetshenziswa Kwezikhulisamazwi Zamanje Kuzinhlelo Zokulawula Izimoto Ezinezigaba Ezintathu

Isibonelo esiyinhloko sokushintshwa okusheshayo kwemodi evamile kagesi kwenzeka esilinganisweni samanje sesigaba sesistimu yokulawula imoto yezigaba ezintathu. Kulezi zinhlelo, isilawuli sithumela amasignali e-pulse-width modulation (PWM) esigabeni se-inverter ukushayela isigaba ngasinye semoto (Umfanekiso 2).

Umfanekiso 2. Inzwa Yamanje Yokulawula Izimoto Yezigaba Ezintathu

I-shunt resistor ibekwe ochungechungeni ngenjini ukuze kulinganiswe i-voltage ehlukile kuyo yonke, inikeze impendulo yamanje esheshayo. Le mpendulo yenza isilawuli sikwazi ukunquma isigaba sesignali ngayinye. Njengoba ukushaya kwe-PWM ngakunye kufika, amandla kagesi emodi evamile ku-shunt resistor ashintsha ngokushesha kulo lonke uhla lokuhlinzeka, ukusuka ku-V- kuya ku-V+. Lezi zinguquko ezisheshayo ze-PWM zidinga ama-amplifiers anomkhawulokudonsa ophezulu kanye nokucindezelwa okusebenzayo kwama-overshoots esikhashana phakathi nemiphetho ekhuphukayo newayo.