Name ______

ES 330 Electronics II Homework # 10

(Fall 2017 – Due Wednesday, December 6, 2017)

IMPORTANT NOTE: These four problems, Problem 1 through Problem 4, make use of the common-source NMOS amplifier shown schematically immediately below. This is Figure 10.3(a) in Section 10.1 of Sedra and Smith (refer to pages 699 to 707 for definitions and additional information).

Problem 1 (20 points)

For the common-source amplifier shown in the above schematic assume the following component values:

RG1 = 2 MW, RG2 = 1 MW, Rsig = 200 kW

Find the value of the coupling capacitor CC1 (calculate its value to only one significant figure) corresponding to a pole frequency at 10 Hz, or slightly lower.

The figure on the next age will assist in working this problem.

Problem 2 (20 points)

For the common-source amplifier in the above schematic assume the following component values:

RD = 10 kW, RL = 10 kW, and r0 is very large; r0 ® infinite

Find the value of the coupling capacitor CC2 (calculate its value to only one significant figure) corresponding to a pole frequency at 10 Hz, or slightly lower.

Problem 3 (25 points)

For this common-source amplifier assume the transistor’s transconductance value to be gm = 5 mA/V and the series source resistor RS = 1.8 kW. Determine the value of the bypass capacitor CS (again calculate to only one significant figure) that places its associated pole frequency at 100 Hz or slightly lower. What are the frequencies of the pole (fp ) and the zero ( fz ) using the value for CS you calculated?

Problem 4 (35 points)

Again using the common-source amplifier, we now have a new set of values for the components in the amplifier:

Rsig = 100 kW, RG1 = 47 MW, RG2 = 10 MW,

CC1 = 0.01 mF, RS = 2 kW, CS = 10 mF,

RD = 4.7 kW, RL = 10 kW, CC2 = 1 mF,

and the transistor’s transconductance is gm = 5 mA/V and ignore r0.

Calculate the following parameters: AM, fp1, fp2, fz, fp3 and fL. Note: The parametric notation is defined in Section 10.1 of Sedra and Smith. For example, see page 704 of Sedra & Smith for the definition of fL.

AM = ______

fp1 = ______

fp2 = ______

fz = ______

fp3 = ______

fL = ______