Power Amplifier vs Voltage Amplifier
Amplifiers yog cov khoom siv hauv hluav taws xob, txhawm rau txhim kho lossis ua kom muaj zog ntawm lub teeb liab. Nyob ntawm qhov yuav tsum tau ua amplifiers yog siv los ua kom qhov voltage ntawm lub teeb liab los yog tam sim no ntawm lub teeb liab los yog lub zog ntawm lub teeb liab. Feem ntau amplifiers yog 3 qhov chaw nres nkoj, nrog rau qhov chaw nres nkoj input, qhov chaw nres nkoj tso zis thiab chaw nres nkoj fais fab. Kev ua haujlwm dav dav ntawm lub tshuab hluav taws xob yog tsim kom muaj zog ntawm cov teeb liab tawm tswv yim ntawm cov zis, siv lub zog los ntawm lub zog hluav taws xob. Qhov sib piv ntawm cov teeb liab tso zis thiab cov teeb liab tawm tswv yim ntawm cov khoom xws li voltage, tam sim no lossis lub zog raug xa mus rau Gain. Piv txwv li, qhov sib piv ntawm cov zis voltage thiab qhov input voltage yog qhov Voltage nce ntawm lub amplifier GAIN voltage=Vout / V in, and similarly GAINpower=Pout / Pin Rau kev ua haujlwm linear ntawm lub amplifier, raws li qhov yuav tsum tau muaj nyob rau hauv feem ntau, qhov nce qhov tseem ceeb yuav tsum tsis tu ncua hauv cheeb tsam ntawm kev ua haujlwm.
Voltage Amplifier
Voltage amplifiers yog cov khoom siv uas ua kom lub zog tawm tswv yim, yog tias ua tau nrog tsawg tam sim no ntawm cov zis. Technically, lub amplifier nrog high voltage nce yog ib tug voltage amplifier, tab sis nws tej zaum yuav los yog tsis muaj ib tug tsawg tam sim no nce. Lub zog nce ntawm lub amplifier kuj qis vim cov khoom no. Transistors, thiab op amps, muab kev saib xyuas kom zoo thiab lwm yam kev mob, ua raws li qhov yooj yim voltage amplifiers. Daim ntawv thov tseem ceeb ntawm voltage amplifiers yog ntxiv dag zog rau lub teeb liab kom nws tsis tshua muaj kev cuam tshuam los ntawm lub suab nrov thiab attenuation. Thaum cov teeb liab kis tau poob nws lub zog thiab deformed, qhov kev nthuav dav ntawm qhov hluav taws xob ntawm lub transmitter yuav txo qis cov nyhuv thiab tus txais yuav tuaj yeem ntes thiab txhais cov teeb liab nrog qhov tseeb.
Ideal voltage amplifiers muaj infinite input impedance thiab xoom output impedance. Nyob rau hauv kev xyaum, lub amplifier nrog siab input impedance piv rau cov zis impedance yog xam raws li ib tug zoo voltage amplifier.
Power Amplifiers
Fais fab amplifiers yog cov khoom siv los ua kom lub zog tawm tswv yim, yog tias ua tau nrog kev hloov pauv tsawg kawg hauv qhov tso zis hluav taws xob nrog rau qhov hluav taws xob input. Ntawd yog, lub hwj chim amplifiers muaj lub zog loj, tab sis cov zis hluav taws xob tuaj yeem hloov lossis tsis hloov. Lub amplifier efficiency ntawm lub hwj chim amplifiers yog ib txwm qis dua 100%. Yog li ntawd, high heat dissipation yog pom nyob rau hauv lub hwj chim amplification theem. Lub hwj chim amplifiers yog siv nyob rau hauv cov khoom siv uas yuav tsum tau muaj lub zog loj thoob plaws lub loads. Nyob rau hauv ntau theem amplifiers, lub zog amplification yog ua nyob rau hauv cov theem kawg ntawm amplification. Lub suab amplifiers thiab RF amplifiers siv lub zog amplifiers ntawm theem kawg kom xa lub zog txaus rau lub nra. Servo motor controllers kuj siv lub zog amplifiers los tsav cov motors. Lub hwj chim amplifiers tau muab faib ua ob peb chav nyob ntawm qhov feem ntawm cov teeb liab input siv hauv amplification. Cov chav kawm A, B, AB thiab C yog siv nyob rau hauv analog circuits, thaum chav kawm D thiab E yog siv nyob rau hauv switching circuits.
Hauv cov khoom siv hluav taws xob niaj hnub no, feem ntau lub zog amplifiers tau tsim nrog cov khoom siv semiconductor thaum lub tshuab nqus tsev (valve) raws li amplifiers tseem siv nyob rau hauv ib puag ncig, qhov tseeb, zaus teb, thiab kev ua siab ntev yog qhov tseem ceeb. Piv txwv li, guitar amplifiers siv li qub rau qhov zoo thiab cov khoom siv tub rog siv li qub rau nws txoj kev ua siab ntev tiv thaiv cov hluav taws xob muaj zog.
Qhov txawv ntawm Voltage Amplifiers thiab Fais Amplifiers yog dab tsi?
• Voltage amplifiers muaj qhov nce siab voltage, thaum lub zog amplifiers muaj lub zog nce siab.
• Nyob rau hauv feem ntau voltage amplifiers, tam sim no nce yog tsawg heev, thaum lub hwj chim amplifiers muaj ib tug tseem ceeb tam sim no nce, uas ua rau lub hwj chim nce.
• Voltage amplifiers dissipate kuj tsawg tshav kub tshaj lub hwj chim amplifiers. Yog li ntawd, voltage amplifiers muaj zog efficiency ntau dua li lub hwj chim amplifiers. Tsis tas li ntawd, lub zog amplifiers yuav tsum tau ua kom txias ntxiv vim qhov tseeb no.
