Microelectronic Circuits Analysis and Design 2nd. Edition by Muhammad H. Rashid | 9780495667728 | 0495667722

Microelectronic Circuits Analysis and Design [EXP-51858]

234 SOLVED PROBLEMS

Question: 9.14

Analyzing a BJT differential amplifier with a current mirror active load The parameters of the differential amplifier in Fig. 9.44 are βF = 100, IQ = 20 µA, and VCC = 15 V. Calculate Ad, Rid, Ro, and the overall voltage gain with load Ad(load). Assume VT = 26 mV and VA = 100 V.

Verified Answer:

We have

I_{ Cl }=I_{ C 2}=I_{ C 4}=\frac{20...

Question: B.4

Analyzing a circuit with a current-dependent current source For the circuit shown in Fig. B.4 with a current-dependent current source, find the currents IB, IC, and IE and voltage VC. Assume RTh = 15 kΩ, rπ = 1 kΩ, RC = 2 kΩ, RE = 500 Ω, βF = 100, VCC = 30 V, and VTh = 5 V.

Verified Answer:

Using KCL at node 1, we get

I_{ E }=I_{ B ...

Question: 9.7

Analyzing a depletion MOS differential pair with an active current source The parameters of the depletion MOS differential pair in Fig. 9.22 are RSS = 50 kΩ, IQ = 10 mA, VDD = 30 V, and RD = 5 kΩ. The depletion MOSFETs are identical and have Vp = -4 V and IDSS = 20 mA. Assume VM = 100 V. (a)

Verified Answer:

(a) For

v_{ id }=10 mV

, Eq. (9.72...

Question: 9.2

Analyzing a MOS differential pair with an active current source The parameters of the MOS differential pair in Fig. 9.8 are RSS = 50 kΩ , IQ = 10 mA, VDD = 30 V, and RD = 5 kΩ. The NMOSs are identical and have Kn = 1.25 mA/V^2 and Vt = 1.0 V. Assume VM = 100 V. (a) Calculate the DC drain currents

Verified Answer:

(a) For

v_{ id }=10 mV

, Eq. (9.42...

Question: 9.3

Analyzing an NMOS differential pair with an active current source Repeat Example 9.2 if the transistor current source is replaced by the resistance RSS = 50 kΩ ; that is, ISS = 0. Assume VM = 100 V.

Verified Answer:

(a) The DC drain current and the gate–source volta...

Question: 9.15

Analyzing BiCMOS amplifiers The DC biasing current of a BiCMOS amplifier is kept constant at IQ = 10 µA. All bipolar transistors are identical, with VA = 50 V and βF = 40. Also, the MOS transistors are identical, with VM = 20 V, Kn = 25 µA/V^2, W = 30 µm, and L = 10 µm. Assume VT = 25.8 mV.

Verified Answer:

\begin{aligned}&V_{ A }=50 V , \beta_{ ...

Question: 9.6

Analyzing cascoded MOS amplifiers The DC biasing current of the MOS amplifier shown in Fig. 9.19(a) is kept constant at IQ = 10 µA. All MOS transistors are identical: VM = 20 V, Kn = 25 µA/V^2 , W = 30 µm, and L = 10 µm. (a) Determine the differential voltage gain Ad for single-ended output at the

Verified Answer:

You are given

V_{ M }=20 V , K_{ n }=25 \m...

Question: 14.4

Analyzing the CMOS op-amp MC14573 The CMOS amplifier in Fig. 14.20 is operated at a biasing current of IQ = 40 µA. The parameters of the MOSFETs are Kx = 10 µA/V^2, ⏐VM(NMOS)⏐= VM(PMOS) = 70 V, Vt = 0.5 V, and W/L = 160 µm/10 µm, except for Q7, for which W/L = 320 µm/10 µm. Assume VDD = -VSS = 5 V.

Verified Answer:

(a)

K_{ p }, V_{ GS }, g_{ m }, \text { an...

Question: 14.5

Analyzing the CMOS op-amp TLC1078 The CMOS amplifier in Fig. 14.21 is operated at a biasing current of IQ = 40 µA. The parameters of the MOSFETs are Kx = 10 µA/V^2 , ⏐VM(NMOS)|= VM(PMOS) = 70 V, Vt = 0.5 V, and W/L = 160 µm/10 µm, except for Q10, for which W/L = 40 µm/10 µm. Find the value of the

Verified Answer:

We have

\begin{aligned}K_{ p } &=\frac{...

Question: 4.2

Application as a diode AND logic function A diode circuit that can generate an AND logic function is shown in Fig. 4.3. A positive–logic convention denotes logic 0 for 0 V and logic 1 for a positive voltage, typically 5 V. Show the truth table that illustrates the logic output.

Verified Answer:

If input

V_{ A } \text { or } V_{ B } [/la...