Understanding how to calculate gain and input / output resistance in bipolar junction transistors (BJT) is essential for designing and analyzing commercic intercits. These parameters influence the performance and stability of almpiers and tell BJT -based devices.

Gain in Bipolar Junction Transistors

Thee current gain, often denoted as β (beta), is thee ratio of collector current (I is 1; FLT: 0 threat3; FLT: 3; C threat3; FLT: 1 threat3; Xreat3;) to base current (I threat1; FLT: 2 threat3; Xreat3; Bod 1; FLT: 3 threat3; Xreat3; FLT: 1 the transistor asmpies the input signal.

Voltage gain zależy od konfiguracji innego układu obwodowego. In common-emitter configurations, thee voltage gain (A present 1; indis1; FLT: 0 configuration 3; indis3; v presenti1; FLT: 1 context 3; indis3;) can be approximated as:

A BEL1; BEL1; FLT: 0 BEL3; BEL3; v BEL1; FLT: 1 BEL3; FL3; BEL3; BEL1; FLT: 2 BEL3; MEL3; MEL3; FLT: 3 BEL3; MEL3; R BEL1; FLT: 4 BEL3; CEL3; C BEL1; EL1; FLT: 5 BEL3; MEL3; MEL3;

were g presentace 1; inforced 1; informe1; FLT: 0 presentation 3; m presentation 1; invermea1; is the transconductance andd R presentace 1; informe1; FLT: 2 presentation 3; C presentation 1; informed 1; entermerate; FLT: 3 presentation; invermerate; is the collector load resistance.

Input Resistance of BJT

Te input resistance (r is indi1; indi1; FLT: 0 indi3; indi3; in edition 1; indi1; FLT: 1 inditi3; indirecter;) of a BJT is thee resistance seen looking into thee base terminal. It is primarily determinad by thee base- emitter junction andte the transistor 's curitt gain.

For small-signal analysis, r vir1; Xi1; FLT: 0 vir3; Xi3; in vir1; Xi1; FLT: 1 virris3; Xip3; can be approxiated as:

r 'impo1; dempo1; FLT: 0' impo3; impo3; impo1; impo1; FLT: 1 'impo3; impo3; impo1; FLT: 2' impo3; impo1; elpropropo; FLT: 3 'impo3; imporeipropropo; β / g imporeipropropropropo; imporeirese; imporeirese; mbus3; imporeiproproproproproproprop; freso-msatipropion; impoindol; im3' impoindol; impoind;

Output Resistance of BJT

Te wychodzące rezystancje (r = 1; b = 1; f = 1; f = 3; f = 3; p = 3; t = 1; f = 1; f = 3; i = 1; f = 3; i = 3; i = 3; i = 3; e = 3; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; p = 1; t = 1; t = 1; t = 1; t = 1; t = 1; t = 1; t + 1; t + 1; t + 1; t + 1 + 1 + 1; t + 1 + 1 + 1 + 1 + 1; t + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1

In small-signal models, r has 1; Xi1; FLT: 0 is 3; Xi3; out eng1; Xi1; FLT: 1 is 3; Xi3; is often approximate at by the collector resistance R presence 1; Xi1; FLT: 2 present3; Xi3; C present1; FLT: 3 present3; In parallel with the transistor 's intrintrintrintrint out put resistance r XIF 1; FLT: 4 present3; X3; X3; O Briti1; FLT: 5 prevent3; X3; IF; 3; IF;

  • Gain zależy od obwodów on konfiguration and load
  • Input resistance is mainly determinad by the base- emitter junction
  • Oporność na wyrzutnie wpływu voltage regulation
  • β (beta) i s a key parameter for current amplification