Common-Emitter Configuration problem. Answer no. 24 onlyReference: Electronic device and circuit theory 11th edition by Boylestad b. Find the value of a corresponding to this operating point.c. At VCE = +6 V, find the corresponding value of ICEo-d. Calculate the approximate value of ICBO using the de beta value obtained in part (a).*20. a. Using the characteristics of Fig. 3.13a, determine IcEO at VcE = 10 V.b. Determine Bac at Ig = 10 µA and VcE = 10 V.c. Using the Bac determined in part (b), calculate IcBo-21. a. Using the characteristics of Fig. 3.13a, determine Bg, at lg = 60 µA and Vcg = 4 V.b. Repeat part (a) at Ig = 30 µA and VcE = 7 V.c. Repeat part (a) at Ig = 10 µA and VcE = 10 V.d. Reviewing the results of parts (a) through (c), does the value of Bg. change from point to pointon the characteristics? Where were the higher values found? Can you develop any general con-clusions about the value of Ba: on a set of characteristics such as those provided in Fig. 3.13a?*22. a. Using the characteristics of Fig. 3.13a, determine Byc at Ig = 60 µA and VcE = 4 V.b. Repeat part (a) at Ig = 30 µA and VcE =7 V.c. Repeat part (a) at Ig = 10 µA and VCE = 10 V.d. Reviewing the results of parts (a) through (c), does the value of Bac change from point topoint on the characteristics? Where are the high values located? Can you develop any gen-eral conclusions about the value of Bac On a set of collector characteristics?e. The chosen points in this exercise are the same as those employed in Problem 21. If Prob-lem 21 was performed, compare the levels of Bac and Bac for each point and comment onthe trend in magnitude for each quantity.23. Using the characteristics of Fig. 3.13a, determine Ba, at Ig = 25 µA and VcE = 10 V. Thencalculate ag and the resulting level of Ig. (Use the level of Ic determined by Ic = Bap.)24. a. Given that ase = 0.980, determine the corresponding value of Bac-b. Given Bac = 120, determine the corresponding value of a.c. Given that Bác = 120 and Ic = 2.0 mA, find Ig and Ig.25. From memory only, sketch the common-emitter configuration (for npn and pnp) and insert theproper biasing arrangement with the resulting current directions for Ig. Ic, and Ig.3.6 Common-Collector Configuration26. An input voltage of 2 V rms (measured from base to ground) is applied to the circuit of Fig. 3.21.Assuming that the emitter voltage follows the base voltage exactly and that Ve (rms) = 0.1 V,calculate the circuit voltage amplification (A, = V,/V) and emitter current for Rg = 1 kN. Beta (B)DC Mode In the de mode the levels of lc and Ig are related by a quantity called beta anddefined by the following equation:Ba(3.10)where Ie and Ig are determined at a particular operating point on the characteristics. Forpractical devices the level of B typically ranges from about 50 to over 400, with most in themidrange. As for a, the parameter B reveals the relative magnitude of one current withrespect to the other. For a device with a ß of 200, the collector current is 200 times themagnitude of the base current.On specification sheets Ba, is usually included as hsg with the italic letter h derived froman ac hybrid equivalent circuit to be introduced in Chapter 5. The subscript FE is derivedfrom forward-current amplification and common-emitter configuration, respectively.COMMON-EMITTERCONFIGURATIONAC Mode For ac situations an ac beta is defined as follows:Alc(3.11)The formal name for B, is common-emitter,. forwand-current, amplification factor. Since thecollector current is usually the output current for a common emitter configuration and the basecurrent is the input curent, the term amplification is included in the nomenclature above.Equation (3.11) is similar in format to the cquation for a in Section 3.4. The procedurefor obtaining a, from the characteristic curves was not described because of the difficultyof actually measuring changes of Icand Ig on the characteristics. Equation (3.11), bowever,can be described with some clarity, and, in fact, the result can be used to find a, using anequation to be derived shortly.On specification sheets B_ is nomally referred to as hy, Note that the only differencebetween the notation used for the de beta, specifically, Bue - hyɛ, is the type of letteringfor each subscript quantity.The use of Eq. (3.11) is best described by a numerical example using an actual set ofcharacteristics such as appearing in Fig. 3.13a and repeated in Fig. 3.17. Let us determineB for a region of the characteristics defined by an operating point of Ig - 25 µA and VCE- 7.5 V as indicated on Fig. 3.16. The restriction of VcE- constant requires that a verticalline be drawn through the operating point at Vcg- 7.5 V. At any location on this verticalline the voltage Vee is 7.5 V, a constant. The change in Ia(Ala) as appearing in Eq. (3.II)is then defined by choosing two points on cither side of the Q-point aklong the vertical axisof about equal distances to either side of the Q-point. For this situation the Ig- 20 µA and30 µA curves meet the requirement without extending too far from the Q-point. They also

Alpha= beta/(1+beta). Beta = alpha/(1-alpha). Emitter current = collector current +base current.

Answered: 4. a. Given that ase = 0.980, determine…

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...