Question BJT - MOSFET amplifiers Problem 1: Find expression of the voltage gain, input and output resistance for the circuit shown in Figure 1? VCC Vcc RC & Rc RB Vout RB • Vout WQ Q2 021 Isias Figure I BJT Amplifier Circuits Problem 2: Find expression of the voltage gain and output resistances for all the circuit shown in Figure 2? Don't neglect Early Effect Voo Voo Voo • Von Vour • Vou HIM VM M, TM Voo Voo M2 Voo M2 RO • Vout Vout Vout • Ем, чем VEM HIM (d) Figure 2 MOS-FET Common Source Amplifiers Problem 3: Find expression of the output resistances for all the circuit shown in Figure 3? Don't neglect Early effect VDO • Row • Rout • Vo M27 216V Rout VOD Vin-M2 V1M2 VEM IMM Rout (c) Figure 3 MOS-FET Amplifiers Problem 4: For the BJT-based amplifier shown in Fig.4: 1. Derive the expressions of the voltage gain, input and output resistances 2. Find the low frequency voltage gain and derive expressions for the poles and zeros. (Consider C and CB order of magnitude is uF) 3. Find the high frequency voltage gain and derive expressions for the poles. 4. Sketch the Bode-plot of the voltage gain I VCC RC R Vout -W Q11 C1 WHE Rs R2 3 4 = Co Figure 4 BJT-Based Amplifier Problem 5: For the amplifier shown in Fig. 5, the BJT parameters are: VBE=0.7V, B=200, Cu=0.8 pF, Ctrl pF and VA=, the MOS transistor's parameters are: K= 2 mA/V2, VI= 1 V, Cds=Cgd=1 pF, VA== 1. Find the DC Currents for the transistors (Hint: calculate the DC currents while ignoring the base current) 2. Calculate the Mid-band Voltage gain and Input Resistance 3. Calculate the low frequency poles due to the external capacitances and the lower 3-dB frequency (Hint: you can use Miller's theorem to replace the 10 MS2 with two grounded Resistors.) 4. Calculate the high frequency poles and the higher 3-dB frequency (Hint: you can use Miller's theorem to replace the 10 MS with two grounded Resistors here as well) 5. Sketch the Bode plot of the voltage gain (Magnitude Only) +5 V 33 k12 C2 RG 10 ΜΩ w A 11 Vout 100 ΚΩ C. 1uF V mo 1 1 k 2 0.1 uF Q2 V sig 6.8 k 2 Rin Figure 5 Voltage Cascaded Amplifier
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BJT - MOSFET amplifiers
Transcribed Image Text: Problem 1: Find expression of the voltage gain, input and output resistance for the circuit shown in Figure 1? VCC Vcc RC & Rc RB Vout RB • Vout WQ Q2 021 Isias Figure I BJT Amplifier Circuits Problem 2: Find expression of the voltage gain and output resistances for all the circuit shown in Figure 2? Don't neglect Early Effect Voo Voo Voo • Von Vour • Vou HIM VM M, TM Voo Voo M2 Voo M2 RO • Vout Vout Vout • Ем, чем VEM HIM (d) Figure 2 MOS-FET Common Source Amplifiers
Problem 3: Find expression of the output resistances for all the circuit shown in Figure 3? Don't neglect Early effect VDO • Row • Rout • Vo M27 216V Rout VOD Vin-M2 V1M2 VEM IMM Rout (c) Figure 3 MOS-FET Amplifiers Problem 4: For the BJT-based amplifier shown in Fig.4: 1. Derive the expressions of the voltage gain, input and output resistances 2. Find the low frequency voltage gain and derive expressions for the poles and zeros. (Consider C and CB order of magnitude is uF) 3. Find the high frequency voltage gain and derive expressions for the poles. 4. Sketch the Bode-plot of the voltage gain I VCC RC R Vout -W Q11 C1 WHE Rs R2 3 4 = Co Figure 4 BJT-Based Amplifier
Problem 5: For the amplifier shown in Fig. 5, the BJT parameters are: VBE=0.7V, B=200, Cu=0.8 pF, Ctrl pF and VA=, the MOS transistor's parameters are: K= 2 mA/V2, VI= 1 V, Cds=Cgd=1 pF, VA== 1. Find the DC Currents for the transistors (Hint: calculate the DC currents while ignoring the base current) 2. Calculate the Mid-band Voltage gain and Input Resistance 3. Calculate the low frequency poles due to the external capacitances and the lower 3-dB frequency (Hint: you can use Miller's theorem to replace the 10 MS2 with two grounded Resistors.) 4. Calculate the high frequency poles and the higher 3-dB frequency (Hint: you can use Miller's theorem to replace the 10 MS with two grounded Resistors here as well) 5. Sketch the Bode plot of the voltage gain (Magnitude Only) +5 V 33 k12 C2 RG 10 ΜΩ w A 11 Vout 100 ΚΩ C. 1uF V mo 1 1 k 2 0.1 uF Q2 V sig 6.8 k 2 Rin Figure 5 Voltage Cascaded Amplifier
More Transcribed Image Text: Problem 1: Find expression of the voltage gain, input and output resistance for the circuit shown in Figure 1? VCC Vcc RC & Rc RB Vout RB • Vout WQ Q2 021 Isias Figure I BJT Amplifier Circuits Problem 2: Find expression of the voltage gain and output resistances for all the circuit shown in Figure 2? Don't neglect Early Effect Voo Voo Voo • Von Vour • Vou HIM VM M, TM Voo Voo M2 Voo M2 RO • Vout Vout Vout • Ем, чем VEM HIM (d) Figure 2 MOS-FET Common Source Amplifiers
Problem 3: Find expression of the output resistances for all the circuit shown in Figure 3? Don't neglect Early effect VDO • Row • Rout • Vo M27 216V Rout VOD Vin-M2 V1M2 VEM IMM Rout (c) Figure 3 MOS-FET Amplifiers Problem 4: For the BJT-based amplifier shown in Fig.4: 1. Derive the expressions of the voltage gain, input and output resistances 2. Find the low frequency voltage gain and derive expressions for the poles and zeros. (Consider C and CB order of magnitude is uF) 3. Find the high frequency voltage gain and derive expressions for the poles. 4. Sketch the Bode-plot of the voltage gain I VCC RC R Vout -W Q11 C1 WHE Rs R2 3 4 = Co Figure 4 BJT-Based Amplifier
Problem 5: For the amplifier shown in Fig. 5, the BJT parameters are: VBE=0.7V, B=200, Cu=0.8 pF, Ctrl pF and VA=, the MOS transistor's parameters are: K= 2 mA/V2, VI= 1 V, Cds=Cgd=1 pF, VA== 1. Find the DC Currents for the transistors (Hint: calculate the DC currents while ignoring the base current) 2. Calculate the Mid-band Voltage gain and Input Resistance 3. Calculate the low frequency poles due to the external capacitances and the lower 3-dB frequency (Hint: you can use Miller's theorem to replace the 10 MS2 with two grounded Resistors.) 4. Calculate the high frequency poles and the higher 3-dB frequency (Hint: you can use Miller's theorem to replace the 10 MS with two grounded Resistors here as well) 5. Sketch the Bode plot of the voltage gain (Magnitude Only) +5 V 33 k12 C2 RG 10 ΜΩ w A 11 Vout 100 ΚΩ C. 1uF V mo 1 1 k 2 0.1 uF Q2 V sig 6.8 k 2 Rin Figure 5 Voltage Cascaded Amplifier
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(1) (i) By APPlying KVL,\begin{array}{l}V_{C C}-I_{C} R_{C}=V_{\text {out }} \\V_{\text {in }}-I_{B} R_{B}-V_{B E}=0\end{array}As we know Voltage gain \Rightarrow A_{V}=\frac{V_{\text {out }}}{V_{\text {in }}}.\begin{array}{l}V_{\text {out }}=V_{C C}-I_{C} R_{C} \\V_{\text {in }}=V_{B E}+I_{B} R_{B} \\\therefore A_{V}=\left[\frac{V_{C C}-I_{C} R_{C}}{V_{B E}+I_{B} R_{B}}\right]\end{array}Now we have to find out expression for input and output resistance.\begin{array}{l}\text { Output Resistance }\left(R_{C}\right)=\frac{V_{C C}-V_{\text {out }}}{I_{C}} \\\text { Input Resistance }\left(R_{B}\right)=\frac{V_{\text {in }}-V_{B E}}{I_{B}}\end{array}(ii) Now for 2^{\text {nd }} part by applying K V L, writing KVL for input side,V_{\text {in }}-I_{B} R_{B}-V_{B E}=0Writing KVL for outputside,\begin{array}{l} V_{\text {out }}-I_{C} R_{C}-V_{c C}-V_{B}=0 \\\therefore V_{i n}=V_{B E}+I_{B} R_{B} \\V_{\text {out }}=V_{B}+V_{c c}+I_{C} R_{C}\end{array}So, A_{V}=\frac{V_{\text {out }}}{V_{\text {in }}}=\left[\frac{V_{B}+V_{C C}+I_{C} R_{C}}{V_{B E}+I_{B} R_{B}}\right]Now let us find R_{B}=\frac{V_{\text {in }}-V_{B E}}{I_{B}}\text { similarly } R_{C}=\frac{V_{\text {out }}-V_{B}-V_{C C}}{I_{C}} ...