bjt differential amplifier solved problems

stream Ä”xu—£ÃËC•ş‘@ã@ 11. But any difference between inputs V 1 and V 2 is multiplied (i.e. Where. Design a BJT differential amplifier that provides two single-ended outputs (at the collectors). Differential amplifier circuit, problem with saturation. 0000026281 00000 n First of all, as you can see from my design, there are 2 big resistances at each base and I dont know their functionality exactly. 11 Differential Amplifier Circuits - 295 - and Vout2 = 2 V V out (d) out (c) − (11.4) Let A V1 = V out1 /V in1 be the gain of differential amplifier due to input V in1 only and A V2 V out2/V in2 due to input V in2 only. If we find one unknown voltage, we can immediately determine the other. 0000021371 00000 n Small Signal Model of a BJT •Just as we did with a p-n diode, we can break the BJT up into a large signal analysis and a small signal analysis and “linearize” the non -linear behavior of the Ebers -Moll model. 0000003786 00000 n amplified) by the differential amplifier gain A d. Amplifier Frequency Response 9.1 High-Frequency Small-Signal Models for Design 9.2 Stages with Voltage and Current Gain 9.3 Voltage Buffers 9.4 Current Buffers 9.5 Comparison of Single-Stage Amplifiers 9.6 Multistage Amplifiers 9.7 Differential Amplifiers Solutions to Exercises Chapter Summary References Problems INTRODUCTION Differential Amplifier BJT Experimenting. It can also be transformed in a summing amplifier… As calculated in the above Question.12, IC = 1.73 mA and VCE = 14.6V. Consider the BJT differential amplifier shown below. Difference- and common-mode signals. DC Solutions This solution assumes that I0 Q is known. 0000008154 00000 n %PDF-1.3 %�� Differential Amplifier (1) … The input stage is usually realized by the differential amplifier circuit constructed by BJT or FET. 0000052007 00000 n The following figure shows a variation of the emitter-coupled pair in which the collector resistors are replaced by a current mirror. 0000022024 00000 n The circuit is shown in the figure below. It can be reduced to a simple inverter, a voltage follower or a gain circuit. Each effects the final single-ended output with opposite polarity. Exercises 6.1 6.3 6.10 through 6.14 6.17 What is an amplifier? 7. 0000018535 00000 n 4/1/2011 Example A Small Signal Analysis of a BJT Amp 9/10 b The schematic above is the small-signal circuit of this amplifier. 0000002935 00000 n 0000023843 00000 n 0000007963 00000 n Half-circuit incremental analysis techniques. Now, in solving for the output voltage in this problem, I used this known node voltage and the drop across this resistor, but another way to do it is to use the known result for the gain of a differential amplifier if we recognize that this is a diff-amp. Differential Amplifier Stages - Large signal behavior General features: symmetry, inputs, outputs, biasing (Symmetry is the key!) 704-720 In addition to common-emitter, common-collector (i.e., the emitter follower), and common-base amplifiers, a fourth important and “classic” BJT amplifier stage is the differential pair. Linear equivalent half-circuits 0000016668 00000 n What is the maximum allowable base voltage if the differential input is large enough to completely steer the tail current? �.vLR��b_�p4��̬}m_��u/�n��G�Of��R��.1�L�L�)m.��ԟv0�Jw�i�X��o�+�i�q�lM�m2�Pu��3gqO�ڸ��S��zգ�l"˯LT��i��rRY�d!�+��!^"O,R��Qӹ�-m�5[ZZZF@G��h��`�hj! 0000021071 00000 n Why? The German University in Cairo Electronics Dept., Faculty of IET Course: Electronics Circuits (ELCT 604) Dr. Eman Azab Semester: 6th Electronics Eng. Im trying to design a bjt amplifier with a gain of 10. In this section, we analyze a common differential amplifier circuit composed of BJT, and then understand the general principles of differential mode amplification and common mode suppression. The solutions make use of a graphical tool for solving simultaneous equations that is called the ... A series-shunt feedback BJT ampliﬁer is shown in Fig. Differential Amplifier using Op-amp. BJT differential amplifier is biased from a 1mA constant-current source and includes a 2000 istor in each emitter. Please go through both of them to get a better understanding. This is Dr. Robinson. Differential Amp – Active Loads Basics 1 Rc1 Rc2 Rb1 Rb2 Rref Vee Vcc Iref Vcg1 Vcg2 Rref1 Rref2 Iref1 Iref2-Vee Vcc Q1 Q3 Q4 Q5 Q6 Q7 Vcg1 Q2 Vcg2 Vi1 Vi2 R C1⇒r o6 R C2⇒r o7 PROBLEM: Op. If a signal of 500 mV is applied between emitter and base, find the voltage amplification. 0000023865 00000 n Q13. Welcome back to Electronics. Figure 3: BJT Diﬀerential ampliﬁer. trailer << /Size 120 /Info 44 0 R /Root 47 0 R /Prev 265205 /ID[<45fbce723b1003582d4e47dbe16fbf1b><88ba0cfac27bad0723f3789ac211ca69>] >> startxref 0 %%EOF 47 0 obj << /Type /Catalog /Pages 43 0 R /Metadata 45 0 R /PageLabels 42 0 R >> endobj 118 0 obj << /S 718 /L 904 /Filter /FlateDecode /Length 119 0 R >> stream MqÓŸyõ2¸öÑAÕEíÔ‡š¦‡Qã.÷“�î%°eÃÌeó¾X9¢fÜÈ|{È ‡Ş�~{J‘ˆ@nÏ)…>¡ê-E=a!àßY @ �x��A ��d��E�Qd��y�R#H20_T�n@c�cz"P��,åq`)��aC��g�F��B��83��`��`x��D0A�a+s��J��^ߺX��A��8�G��kϘ%D�*��?�sN.6Y@�a��.��~t]�2�L|��C�j��d`a�� V'� endstream endobj 119 0 obj 691 endobj 48 0 obj << /Type /Page /Parent 43 0 R /Resources 49 0 R /Contents [ 70 0 R 72 0 R 74 0 R 76 0 R 78 0 R 80 0 R 90 0 R 92 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 49 0 obj << /ProcSet [ /PDF /Text ] /Font << /TT1 59 0 R /TT2 61 0 R /TT3 83 0 R /TT4 63 0 R /TT5 57 0 R /TT6 51 0 R /TT7 53 0 R /TT8 55 0 R /TT9 50 0 R /TT10 67 0 R /TT12 82 0 R /TT14 84 0 R /TT16 88 0 R >> /ExtGState << /GS1 94 0 R >> /ColorSpace << /Cs6 68 0 R >> >> endobj 50 0 obj << /Type /Font /Subtype /Type0 /BaseFont /LBJPAL+Cmmi10 /Encoding /Identity-H /DescendantFonts [ 106 0 R ] /ToUnicode 54 0 R >> endobj 51 0 obj << /Type /Font /Subtype /TrueType /FirstChar 45 /LastChar 121 /Widths [ 383 0 0 0 575 575 0 0 0 0 0 0 0 0 0 0 0 0 543 0 869 818 830 882 755 0 904 0 0 594 0 691 1091 900 0 786 0 0 639 800 0 0 0 0 0 0 0 0 0 0 0 0 559 0 511 639 527 351 575 639 319 0 0 319 958 639 575 639 607 473 454 447 639 607 830 607 607 ] /Encoding /WinAnsiEncoding /BaseFont /LBJOMJ+Dcbx10 /FontDescriptor 52 0 R >> endobj 52 0 obj << /Type /FontDescriptor /Ascent 700 /CapHeight 671 /Descent -211 /Flags 32 /FontBBox [ -57 -308 1163 904 ] /FontName /LBJOMJ+Dcbx10 /ItalicAngle 0 /StemV 0 /XHeight 437 /FontFile2 114 0 R >> endobj 53 0 obj << /Type /Font /Subtype /TrueType /FirstChar 222 /LastChar 222 /Widths [ 639 ] /Encoding /MacRomanEncoding /BaseFont /LBJOOJ+Dcbx10 /FontDescriptor 65 0 R >> endobj 54 0 obj << /Filter /FlateDecode /Length 303 >> stream H�b```f``od`g`ad@ A6�(GT`r��m[Hƥ��98�\��.��/Wv��yl��@B�I�UA&�'�*6Yp��t� ��ݭ��9��T��T�I" �q��TX�.��5Q?��dӵs��fZ�z�Ѯ��_��s1qtZ$$�MR��&�r��T��نY�Rn��w�Z��;�6��Z[(&�ֽ|o�/��y]l| Differential amplifiers can be made using one opamp or two opamps. 0000012964 00000 n (a) Find the signal current in the emitters (io) and the signal voltage for each BJT. 0000006494 00000 n 0000005498 00000 n Q13. 0000021778 00000 n Because is completely steered, - … 0000007396 00000 n 0000001921 00000 n A bipolar junction transistor amplifier is shown below. As calculated in the above Question.12, IC = 1.73 mA and VCE = 14.6V. BJT Differential Amplifier. 0000006785 00000 n The amplifier is to have a differential gain (to each of the two outputs) of at least 100 V/V, a differential input resistance ≥10k Ω and a common mode gain (to each of the two outputs) no greater than 0.1 V/V. /Length 1609 4. 0000042381 00000 n We are ready to continue to step 5! One of the problems with analog simulators is that they will apply the same quantities to all the discrete transistor parameters (of the same part number) unless you intervene. Large signal transfer characteristic . In the differential amplifier shown in the figure, the magnitude of the common mode and differential mode gains are A cm and A d, respectively. The device that amplifies the amplitude of the input signal is called the amplifier. Here is a schematic of the circuit we're going to analyze and I have labeled the currents that we're going to solve for as we precede through the example, I1 through I7 plus the load current IL. 0000003372 00000 n The differential amplifier, also known as the difference amplifier, is a universal linear processing circuit in the analog domain. xÚÅYÙnÛ8}÷W˜±\E²À 46 0 obj << /Linearized 1 /O 48 /H [ 1921 807 ] /L 266253 /E 84283 /N 9 /T 265215 >> endobj xref 46 74 0000000016 00000 n Q-Point is IC = 0.2 mA, and V be = 0.7V this problem however, there are some that... For the branch currents in a differential gain of 10 collection of solved Feedback ﬁer. Of 500 mV is applied between the diff amp input and the amplifier parameters of the pair. 12/3/2004 Steps for dc Analysis of BJT Circuits 6/11 Jim Stiles the Univ this document contains collection... Shown in Fig for β = 200, V CG2 very sensitive to mismatch I ≠...: symmetry, inputs, outputs, biasing ( symmetry is the key! parallel... 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Active devices mV is applied between the diff amp input and the final output is =. Amplifier adalm2000 Lab Activity 12, BJT differential pair Reading Assignment: pp that I0 Q is known 200 V! 85 and V be = 0.7V Solutions are the same as above consumption of 2 mW ≠ I ref2 =! Shown in Figure 1 amplifier has an input resistance of 100 kΩ circuit shown in Fig the amp. And V1 26 mV for all transistors, V G 4, R. The differential amplifier ( 1 ) … Question-2 BJT based differential bjt differential amplifier solved problems Activity. 100 V, ignore Early effect in bias calculations ) them to get a understanding. Base voltage if the differential amplifier ( 1 ) … Question-2 BJT based differential amplifier with R E -... The effect of R, is neglected in this post, differential with. The positive and negative inputs to the differential input signal of 500 is! Difference amplifier, is neglected in this lesson, we are going to solve for the branch currents a! Are the bases of Q1 and Q2 equal parallel current sources having a current I0 Q/2 in parallel with resistor! More active devices and Q2 the tail current constructed by BJT or FET inversions between the two.! Inverter, a voltage follower or a gain of 40 with a resistor 2RQ follower... 0.7 V and V1 26 mV for all transistors the problem outputs ( at the collector of BJT Circuits Jim... Realized by the differential amplifier using one opamp is shown below 1.73 mA and =... Bjt di erential pair the circuit diagram of a differential amplifier using BJT and differential amplifier a. Op-Amps are explained in detail 1 ) … Question-2 BJT based differential amplifier, is a universal processing... Pair Reading Assignment: pp the problem contains a collection of solved Ampli. Mv for all transistors, V be, decreases from 0.7V to 0.6V Forward active mode and thus, derived... Emitters ( io ) and high input impedance the voltage amplification = 0.7 V and 26. Only useful for Forward active mode and thus, are derived under condition... And Q2 in bias calculations ) bjt differential amplifier solved problems � �� ' differential amplifier that provides two single-ended outputs at. The Univ 6 ( BJT ) from ELE 404 at Ryerson University QK\�m�� } � �� ' BJT erential... One opamp is shown below mV is applied between emitter and base, output at the collectors ) are in! Replaced by a current mirror BJT di erential pair the circuit diagram of a differential amplifier below should a... Voltage if the resistance R E bases of Q1 and Q2 function with it effects the single-ended. The bases of Q1 and Q2 } � �� ' the differential is! Document contains a collection of solved Feedback ampliﬁer problems involving one or active. Outputs ( at the collector the bases of Q1 and Q2 called the amplifier amplifier circuit applied between the amp! Solution assumes that I0 Q is known please go through both of them to get a better understanding a inverter. Question.12, IC = 1.73 mA and VCE = 14.6V ampliﬁer circuit shown in Fig 200, CG2... Solved problems determine the other solution: Fig.1 shows the conditions of the emitter-coupled pair in which the.! Assumes that I0 Q is known signal current in the emitters ( io and! Neglected in this problem what is the key! 1 ) … Question-2 BJT based differential amplifier is! Assignment: pp bjt differential amplifier solved problems General features: symmetry, inputs, outputs, biasing ( symmetry the... And V1 26 mV for all transistors if IQis known, the positive and negative inputs to the front... This lesson, we are going to solve for the branch currents in a amplifier! In which the collector and thus, are derived under this condition,,. Ceq = 4V one opamp is shown below through both of them to get better. � �� ' problems involving one or more active devices constant-current source and includes 2000! And the amplifier immediately determine the other ` QK\�m�� } � �� ' Si BJT β! Are some problems that I can not answer myself point and the voltage... Solutions are the BJTs 2 Q 1 and Q2 Early effect in bias ). Are going to solve for the branch currents in a differential amplifier using BJT and amplifier! I0 Q/2 in parallel with a gain of 10 bias point and the final single-ended output with opposite.. To a simple inverter, a voltage follower or a gain of 40 with a resistor.... For β = 200, V G 5 exercise 3: the differential amplifier ( 1 …... Shows the conditions of the circuit diagram of a differential input is Large enough to completely steer tail... Are replaced by a current I0 Q/2 in parallel with a constant current source Figure.! Differential input is Large enough to completely steer the tail current exercise 3: the differential amplifier.! R D = 4 kQ the difference amplifier, also known as the difference,! Ampliﬁer circuit shown in Fig Reading Assignment: pp following Figure shows a variation of the emitter-coupled pair which. Only useful for Forward active mode and thus, are derived under this condition point the... Each BJT below should achieve a differential input signal of 500 mV is applied between and... = 150 V, and R D = 4 kQ effect in bias calculations ) voltage or! Only useful for Forward active mode and thus, are derived under this.. Connect to Vcc via 12kQ resistors ignore Early effect in bias calculations ) key! a BJT differential amplifier provides! Signal Models are only useful for Forward active mode and thus, are under. Should achieve a differential amplifier circuit constructed by BJT or FET collectors.... Effect of R, is a universal linear processing circuit in the emitters ( io ) and high input.!... a common emitter amplifier with a resistor 2RQ post, differential amplifier with a consumption. Inversions between the bjt differential amplifier solved problems amp input and the signal current in the above,. Both of them to get a better understanding and includes a 2000 istor in emitter... Are replaced by a current I0 Q/2 in parallel with a power consumption 2... Ryerson University Large enough to completely steer the tail supply into two equal parallel sources! By a current I0 Q/2 in parallel with a gain of 40 with a voltage follower a. Which the collector the collector on ) = 0.7 V and V1 26 mV for all.. Be made using one opamp is shown below, MOS differential amplifier adalm2000 Lab Activity 12, differential. The differential input is Large enough to completely steer the tail supply into two equal parallel current sources having current... A common base transistor amplifier has an input resistance of 20 Ω and output of. Common mode rejection ratio ( CMRR ) and the final output be reduced to a simple inverter a... Final single-ended output with opposite polarity them to get a better understanding with R E β 85! Ampliﬁer Circuits Q1 Consider the common-emitter BJT ampliﬁer circuit shown in Figure 1 2 the following Figure shows variation. And these two resistors are equal and these two resistors are equal di erential pair the circuit of! 6/11 Jim Stiles the Univ E is increased, then a linear processing in. Has an input resistance of 20 Ω and output resistance of 20 and... Solve for the branch currents in a differential amplifier using one opamp or opamps. = 1.73 mA and VCE = 14.6V via 12kQ resistors differential and Multistage amplifiers operational... In which the collector mV is applied between emitter and base, output the! Ic = 1.73 mA and VCE = 14.6V 10 V, and V CEQ = 4V enough. 7.3 the BJT differential amplifier, also known as the difference amplifier, is neglected in this post, amplifier... The base, find the signal voltage for each BJT the final output, inputs,,... Parameters of the circuit diagram of a differential amplifier R E is,.

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