Can You Solve This? Questions
Current Sources
  1. Floating Load: If Vin = 3 V, RL = 500 ohms, and RL = 1 kohm, what is the load voltage and load current? Answer
  2. Grounded Load #1: If Vin = 3 V, R = 500 ohms, and RL = 100 ohms, what is the load voltage and load current? Answer
  3. Grounded Load #2: If Vin = 3 V, R = 500 ohms, and RL = 100 ohms, what is the load voltage and load current? Answer
  4. Howland: If Vin = 1 V, R = 1 kohm, and RL = 1 kohm, what is the load voltage and load current? Answer
Frequency Effects
  1. Bipolar High-frequency Analysis: A bipolar CE amplifier has Rth = 1 kohm, rb' = 100 ohms, Cc' = 4 pF, fT = 300 MHz, = 100, re' = 2.5 ohms, rc = 1 kohm, and Cstray = 50 pF. What is the base cutoff frequency? The collector cutoff frequency? Answer
  2. JFET High-frequency Analysis: A JFET common-source amplifier has Rth = 600 ohms, gm = 4 mmhos, Ciss = 7 pF, Coss = 4 pF, Crss = 3 pF, rd = 5 kohms, and Cstray = 50 pF. What is the gate cutoff frequency? The drain cutoff frequency? Answer
  3. Identical Cascaded Stages: An amplifier has three identical stages. Each stage has a voltage gain of 20 dB and a bandwidth of 10 kHz. What is the total voltage gain? The overall bandwidth? Answer
  4. Minimum and Maximum Resistances: A carbon resistor has a lead inductance of 20 nH and a stray capacitance of 1 pF. If you want to avoid reactance effects over a frequency range of 0 to 1 MHz, what is the smallest resistance you should use? The largest? Answer
  5. Risetime and Bandwidth: An amplifier with one dominant upper cutoff frequency has a risetime of 1 s. What is its upper cutoff frequency? Answer
  6. Stray Capacitance and Lead Inductance: A carbon resistor has a resistance of 100 kohms, a lead inductance of 20 nH and a stray capacitance of 1 pF. What is the highest frequency that can be used with this resistor to avoid reactive effects that degrade performance? Answer
Heat Analysis
  1. PD Limit with Derating Factor TA: A device has a power rating of 625 mW at an ambient temperature of 25 degrees C. If the derating factor is 5 mW per degree C, what is power rating at an ambient temperature of 75 degrees C? Answer
  2. PD Limit with Derating Factor TC: A device has a power rating of 115 W at a case temperature of 25 degrees C. If the derating factor is 658 mW per degree C, what is power rating at a case temperature of 100 degrees C? Answer
  3. PD Limit with RJA: A device has a power rating of 625 mW at an ambient temperature of 25 degrees C. If the thermal resistance between the junction and the ambient is 200 degrees C/W, what is junction temperature when the ambient temperature is 75 degrees C? Answer
  4. PD Limit with RJC: A device has a power rating of 115 W at a case temperature of 25 degrees C. If the thermal resistance between the junction and the case is 1.52 degrees C/W, what is junction temperature when the ambient temperature is 100 degrees C? Answer
  5. PD Limit with a heat sink: A device has a power rating of 40 W at an ambient temperature of 25 degrees C. If RJC = 3.12 degrees C/W and RCA = 1 degree C/W, what is the junction temperature when the ambient temperature is 75 degrees C? What is the case temperature? Answer
Negative Feedback
  1. Voltage-controlled Voltage Source: A VCVS circuit has a feedback circuit with R1 = 100 kohms and R2 = 1 kohm. The op amp being used has a slew rate of 500 mV per microsecond. What is the voltage gain in decibels? If the output voltage is 1 V peak-to-peak, what is the maximum frequency without slew-rate distortion? Answer
  2. Current-controlled Voltage Source An ICVS circuit has a feedback resistance of 100 kohms. If the input current is 100 mA, what is the output voltage? Answer
  3. Voltage-controlled Current Source: A VCIS circuit has a load resistance of 100 ohms and a feedback resistance of 1 kohm. If the input voltage is 1 V, what is the output current? Answer
  4. Current-controlled Current Source: An ICIS circuit has RL = 100 ohms, R1 = 10 kohms, and R2 = 1 kohm. If the input current is 1 mA, what is the output current? Answer

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