The NMOS transistor in the following common source amplifier circuit is biased so gm = 3 mA/V. Let the various resistances have the following values: Rsig = 50 kohm , RG = 200 kohm, RD = 10 kohm and RL = 20 kohm. Consider that all three external capacitors have very high values, thus acting as shorts at midband. a) What is the voltage gain at midband: Av = vo/vsig b) Calculate the input Rin and output resistances Rout of this amplifier.
A CS amplifier using an NMOS transistor biased in the manner of the circuit below, for which gm = 2 mA/V is found to have an overall voltage gain Gv of -20 V/V. What value should a resistance Rs inserted in the source lead have to reduce the voltage gain by a factor of 4?
Use the MOSFET common source amplifier circuit to answer the questions that follow. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers, Only your work paper will be graded. Assume saturation. All capacitors are large, such that they are shorted at signal frequencies. Neglect the Early effect (assume VA = infinity ). A. (4 pts) Design the gate biasing circuit such that Vov = 1 V. What voltage is the gate voltage, VG ? B. (4 pts) Given that RG1 = 2 Mohm, what is RG2 ? C. (4 pts) What is RD ? D. (4 pts) Draw the small signal equivalent circuit of the amplifier. E. (4 pts) What is the amplifier's output resistance, Rout, as indicated on the schematic?
A. (4 pts) What is gm at this bias point? B. (8 pts) If the maximum current through the gate voltage divider is 12 uA, what are RG1, RG2 ? C. (4 pts) What is the input resistance, Rin? Use the MOSFET common source amplifier circuit to answer the questions that follow. Make sure to show your work and answers on work paper, including the answer with units, and put a box around the final answers. Only your work paper will be graded. Assume saturation. All capacitors are large, such that they are shorted at signal frequencies. Neglect the Early effect (assume VA = infinity ).