Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 20 views

    Expt5 Electronics Eee202uap

    Uploaded by

    sabitavabi
    1. This document describes an electronics lab experiment on studying BJT biasing. The objective is to examine different methods of setting the DC operating point of a transistor and determine the most effective configuration for bias stability. 2. The procedures involve constructing four transistor circuits - fixed bias, fixed bias with emitter resistance, collector feedback bias, and voltage divider bias. Measurements of voltage and current values will be recorded to analyze how the operating point changes with different transistors. 3. Maintaining a stable operating point is important as temperature and transistor parameter variations can cause the point to shift, affecting amplifier performance. Proper biasing helps ensure the operating point remains where initially set.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd

    Expt5 Electronics Eee202uap

    Uploaded by

    sabitavabi
    20 views3 pages
    1. This document describes an electronics lab experiment on studying BJT biasing. The objective is to examine different methods of setting the DC operating point of a transistor and determine the most effective configuration for bias stability. 2. The procedures involve constructing four transistor circuits - fixed bias, fixed bias with emitter resistance, collector feedback bias, and voltage divider bias. Measurements of voltage and current values will be recorded to analyze how the operating point changes with different transistors. 3. Maintaining a stable operating point is important as temperature and transistor parameter variations can cause the point to shift, affecting amplifier performance. Proper biasing helps ensure the operating point remains where initially set.

    Original Description:

    b5

    Copyright

    © © All Rights Reserved

    Available Formats

    DOC, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    1. This document describes an electronics lab experiment on studying BJT biasing. The objective is to examine different methods of setting the DC operating point of a transistor and determine the most effective configuration for bias stability. 2. The procedures involve constructing four transistor circuits - fixed bias, fixed bias with emitter resistance, collector feedback bias, and voltage divider bias. Measurements of voltage and current values will be recorded to analyze how the operating point changes with different transistors. 3. Maintaining a stable operating point is important as temperature and transistor parameter variations can cause the point to shift, affecting amplifier performance. Proper biasing helps ensure the operating point remains where initially set.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    20 views3 pages

    Expt5 Electronics Eee202uap

    Uploaded by

    sabitavabi
    1. This document describes an electronics lab experiment on studying BJT biasing. The objective is to examine different methods of setting the DC operating point of a transistor and determine the most effective configuration for bias stability. 2. The procedures involve constructing four transistor circuits - fixed bias, fixed bias with emitter resistance, collector feedback bias, and voltage divider bias. Measurements of voltage and current values will be recorded to analyze how the operating point changes with different transistors. 3. Maintaining a stable operating point is important as temperature and transistor parameter variations can cause the point to shift, affecting amplifier performance. Proper biasing helps ensure the operating point remains where initially set.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    of 3

    THE UNIVERSITY OF ASIA PACIFIC

    ELECTRONIC CIRCUITS - I LAB PRACTICE


    COURSE NO. EEE202

    EXPT. NO. 5 Name of the Experiment: STUDY OF BJT BIASING


    OBJECTIVE :
    1. To examine the different methods of setting the D.C. operating point of a transistor. 2. To determine the most effective configuration for providing bias ensuring good stability with respect to changes in the Beta ( !. ". To understand how the change of in a transistor circuit can change the #$point of the circuit.

    EQUIPMENTS:
    %ro&ect Board npn transistors (2'2222( C)2)! *esistor (1+,( +.-,! .ultimeter Chords and wire 1 piece 1 piece each 1 piece each 1 unit lot

    PREVIEW:

    THE QUIESCENT POINT OR Q-POINT: The DC operatin point i! "!"a##$ referre% to a! the Q-point or Quiescent Operation Point& That i! the operation point for the tran!i!tor 'hen no a( !i na# i! app#ie% to the !$!tem& The (o##e(tor ("rrent ) IC )at thi! operatin point i! (a##e%) I CQ ) an% the (o##e(tor to emitter *o#ta e at thi! point i! (a##e%) +CEQ& Pro*i%in the ne(e!!ar$ *o#ta e! an% ("rrent! to !et thi! operatin point i! referre% to a! ,ia!in the tran!i!tor& SELECTION O- Q-POINT: To !e#e(t an appropriate Q-point) it i! ne(e!!ar$ to !et it in !"(h a point !o that a 'i%e ran e of inp"t !i na# (an ,e app#ie%& .enera##$) the Q-point i! !et at ha#f the *a#"e of +CC& NEED -OR STABILI/ATION: On#$ the fixin of a !"ita,#e operatin point i! not !"ffi(ient& It m"!t a#!o ,e en!"re% that it remain! 'here it 'a! fixe%& Unfort"nate#$) in tran!i!tor (ir("it! the operatin point !hift! 'ith the "!e of the (ir("it& S"(h a !hift of operatin point ma$ %ri*e the tran!i!tor into an "n%e!ira,#e re ion& Con!e0"ent#$) the amp#ifier ,e(ome! "!e#e!!& There are t'o rea!on! for 'hi(h Q-point ma$ !hift) 1& -ir!t#$) the tran!i!tor parameter! are temperat"re %epen%ent) !o the operatin point ma$ (han e 'ith the temperat"re 2& Se(on%#$) the ("rrent ain) *ar$ from "nit to "nit& -or examp#e) the 3 of a C424 tran!i!tor ma$ *ar$ 'ith that of another C424 tran!i!tor&
    Procedure:

    1& 5ea!"re the *a#"e of R( 'ith a m"#timeter an% re(or% them in the observation sheet in pa e 6& 2& Con!tr"(t the Circuit 1:Fixed Bias 'ith a 2N2222 tran!i!tor a! !ho'n in the fi "re& 7& B$ a%8"!tin the 9::; potentiometer !et +CE< =&9 +& 6& No' re(or% the *ario"! *a#"e! in the a##otte% ta,#e in the Data Collection & Observation Sheet. 9& DON>T CHAN.E THE POTENTIO5ETER +ALUE& Rep#a(e tran!i!tor 2N2222 ,$ tran!i!tor C424 an% repeat !et 6& ?& DON>T CHAN.E THE POTENTIO5ETER +ALUE& Rep#a(e tran!i!tor C424 ,$ tran!i!tor BD179 an% repeat !et 6& =& No') (on!tr"(t the Circuit ! Circuit " and Circuit # an% repeat the !tep! 7) 6)9 an% ?&

    DATA COLLECTION & OBSERVATION SHEET /alue of *c 0 1 1 1 12


    TABLE 1: FIXED BIAS:
    Transistor VCE (vo ts! /*c (volts! I C" VRc#RC ($%! IB ($%! &" IC#IB Percenta'e C(an'e in VCE .. .. .. .. 3

    )N))))

    C*)*

    .. .. .. .. 3 B+,-.

    TABLE 2: FIXED BIAS WITH EMITTER RESISTANCE:


    Transistor VCE (vo ts! /*c (volts! I C" VRc#RC ($%! IB ($%! &" IC#IB Percenta'e C(an'e in VCE .. .. .. .. 3 C*)*

    )N))))

    .. .. .. .. 3 B+,-.

    TABLE : COLLECTOR FEEDBAC! BIAS:


    Transistor VCE (vo ts! /*c (volts! I C" VRc#RC ($%! IB ($%! &" IC#IB Percenta'e C(an'e in VCE . .. .. .. 3 C*)* B+,-. .. .. .. .. 3

    )N))))

    TABLE ": VOLTAGE DIVIDER BIAS:


    Transistor VCE (vo ts! /*c (volts! I C" VRc#RC ($%! IB ($%! &" IC#IB Percenta'e C(an'e in VCE .. .. .. .. 3 C*)* .. .. .. .. 3 B+,-.

    )N))))

    You might also like