a) Parameters of the MOS transistor in the circuit below are given as VTN = 0.24 V, kn'(W/L) = 2.2 mA/V^2, lambda = 0. Assuming that the transistor is operating in saturation region, design the circuit as R1+R2 = 50 kohm and VGS = 0.5 V and VDS = 2.5 V. b) Find voltage gain, vO/vi, input and output resistances of the amplifier.
Find the width-to-length ratios of the transistors in the CMOS logic circuit that implements the logic function f(A,B,C) = C+AB. Symmetrical switching times are desired and the switching times should correspond to the basic CMOS inverter.
Given two pMOS transistors with Vt = -0.4 V connected in series with the source of one at 1.3 V and the drain of the other open. If Vg of both transistors are at 1 V, what voltage will be at the open drain?
Calculate the voltage gain of the following circuit. Assume that the capacitors are very large and λ = 0. Circuit parameters Rsig = 9 kΩ, RG = 29 kΩ, RS = 400 Ω, RL = 3 kΩ, gm = 0,09 S
Calculate the voltage gain, input impedance and output impedance of given amplifier circuit. gm1 = 3mS, gm2 = 1mS, rd1 = rd2 = 10 K, R1 = 2 K, R2 = 1 K. V1 and V2 are the dc bias voltages. Vi is the triangular waveform with a peak voltage of 0.5 V.
For I = 100 uA, determine the transconductance Gm, the output impedance Rout, and the open- circuit voltage gain Avo. of the BiCMOS cascode amplifier in Figure Q2. The transistor parameters are: For BJT, VA = 50 V and B = 100; For the MOSFET, VA = 5 V, unCox = 200 uA/V^2, and W/L = 25.
In this question, you are asked to find the effective transconductance (Gm) and the resistance into the drain (Rx) of a common-source amplifier with source degeneration. Based on the results, the voltage gain of a common-source amplifier with source degeneration will be evaluated a) The figures shown below are a circuit to find the effective transconductance (G) of the NMOSEFT with source degeneration (left) and its corresponding small-signal circuit (right). It is noted that the output is shorted to VDD (ac grounded) since the definition of effective transconductance is the ratio between the short-circuit output current and the input signal voltage. Prove that Gm is given by Gm = id/vin = gm/1+gmRs In this calculation, the current passing through ro can be neglected since, in general, ro is very large when the NMOSFET operates in saturation region and so this current is very small. Thus, the indication of id is the current of the voltage-controlled current source (gmvgs) only. b) The figure shown below is the method to evaluate the resistance looking into the drain (i.e. Rx) of a source-degenerated NMOSFET. The circuit is shown on the left while the equivalent small-signal modeling is shown on the right. It is noted that the bias condition (VBiAS) is set so that the values of gm and ro, can be defined. Moreover, there is no input signal (i.e. Vin = 0) since we would like to see the value of Rx which is due to the circuit only but not due to the external effect. Based on the above small-signal model, prove that RX = ro(1 + gmRS) The complete common-source amplifier with source degeneration is shown below. c) The complete common-source amplifier with source degeneration is shown below. Prove that the voltage gain of this amplifier is given by v. Vin Explain the reason(s) why the voltage gain is negative. What is the physical meaning of negative voltage gain?