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Determine, the no-load voltage gain vo /vi ; ie, do not include the loading effects of the source and load resistance
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1016 Using the AC small-signal mid-frequency
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equivalent circuit shown in Figure P1016 to specify the voltages, currents, etc used in your de nitions and conditions: a De ne the input resistance, output resistance and no-load voltage gain of an ampli er stage Include the conditions required to determine each b Draw a simpli ed model using these three circuit parameters Include the signal source and gain and derive an expression for the overall gain
B Rs
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Figure P1018
1019 The circuit shown in Figure P1018 is the
small-signal equivalent circuit of a common-collector (or emitter follower) ampli er stage The transistor is fabricated from silicon gm r RL RE = 9615 mS = 70 = 7280 RB = 7476 k = 16 RS = 06 k = 17 k
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Determine, at mid-frequency, the output resistance
1020 Shown in Figure P1018 is the AC small-signal
RE RL
mid-frequency equivalent circuit of a common collector [or emitter follower] ampli er stage The Q point and the parameters for the small-signal AC model of the transistor are: gm RB RL = 143 mS r = 909 k = 130 RS = 68 k = 1735 k RE = 5 k = 16 C = 047 F
Figure P1016
1017 The circuit shown in Figure P1015 is a
common-collector (or emitter follower) ampli er stage The transistor is fabricated from silicon A solution for the DC operating (Q or bias) point gives: ICQ R1 RL RE = 25 mA = 330 k = 16 = 17 k = 70 R2 = 100 k RS = 06 k C = 047 F
The input resistance (you may wish to verify it), including the effect of the load resistor, is 680 k Determine, at mid-frequency, the power gain Po /Pi (in dB)
1021 The circuit shown in Figure P1018 is the
mid-frequency, AC small-signal equivalent circuit for a common-collector (or emitter follower) ampli er stage
Determine, at mid-frequency, the AC small-signal mid-frequency equivalent circuit
10
Transistor Ampli ers and Switches
The small-signal AC parameters of the transistor are: gm RB RL C = 40 mS r = 125 k = 50 k RE = 17 k =2k RS = 7 k = 047 F
mid-frequency, or 3 dB below the mid-frequency gain This frequency is the same as the cutoff frequency in a lter
C + vi RB r + v gmV + RC Vo
Determine input resistance
1022 Shown in Figure P1022 is the schematic of a
common-emitter ampli er stage, the most common BJT ampli er state The DC operating (Q or bias) point is: ICQ R1 RC RL C = 25 mA = 70 = 330 k R2 = 100 k = 33 k RE = 17 k = 16 RS = 06 k = 047 F
Figure P1023
Section 2: Field-Effect Transistor Ampli ers 1024 The i-v characteristic of a depletion MOSFET is
shown in Figure P1024(a) and an ampli er circuit based on the MOSFET is shown in Figure P1024(b) Determine the quiescent operating point if VDD = 30 V and RD = 500
Determine the mid-frequency a AC small-signal equivalent circuit b Input resistance c Output resistance d No load voltage gain vo /vi e Power gain in dB
60 3 50 2 40 iD (mA)
+VCC R1 RC
1 30 vGS = 0 V 20 1 2 3 4 0 5 10 15 vDS (V) (a) 20 25 30
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RL 10 R2 RE 0
Figure P1022
1023 Shown in Figure P1023 is the small-signal
high-frequency AC equivalent circuit for a common-emitter BJT ampli er stage Coupling and bypass capacitors have been modeled as short circuits and are not shown For simplicity only one of the two internal BJT capacitances C (= Ccb ) is included Recall that, at high frequencies, the impedance of these capacitances decreases and this affects the input and output resistance and the gain The no-load gain at mid-frequency, the small signal AC transistor parameters, and component values are: vo Avo = = 120 gm = 40 mS r = 25 k vi RB = 44 k RC = 3 k C = Ccb = 3 pF Determine the frequency at which the magnitude of the no-load gain decreases to 0707 of its value at
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