I want to know how those solutions come up especially (c),(d) and (e) V DD8mV;Q2o VG2V; OI2Figure 8.36 The folded cascode. D8.22 Consider the folded-cascode amplifier of Fig. 8.36 for the following case: Vpp = 1.8 V, k, = 4k,,21 and I, = I. Whileand V, = -V,, = 0.5 V. To operate Q, and Q, at equal bias currents I, I,current source I, is implemented using the simple circuit studied in Section 8.2, current source I, isrealized using a cascoded circuit (i.e., the NMOS version of the circuit in Fig. 8.32). The transistorWIL ratios are selected so that each operates at an overdrive voltage of 0.2 V.(a) What must the relationship of (W/L), to (W/L), be?(b) What is the minimum dc voltage required across current source I, for proper operation? Now, ifa 0.1-V peak-to-peak signal swing is to be allowed at the drain of Q, what is the highest de biasvoltage that can be used at that node?(c) What is the value of Vsg of Q,, and hence what is the largest value to which V, can be set?(d) What is the minimum dc voltage required across current-source I, for proper operation?(e) Given the results of (c) and (d), what is the allowable range of signal swing at the output?Ans. (a) (W/L), =4 (W/L),; (b) 0.2 V, 1.55 V; (c) 0.7 V, 0.85 V; (d) 0.4 V; (e) 0.4 V to 1.35 VSG

Given Data: VDD = 4.8 V Vtn = - Vtp = 0.5 V I1 = 2I I2 = I

D8.22 Consider the folded-cascode amplifier of Fig. 8.36 for the following case: Vpp = 1.8 V, k, = 4k, and V, = -V, = 0.5 V. To operate Q, and Q, at equal bias currents I, I, = 21 and I, = 1. While current source I, is implemented using the simple circuit studied in Section 8.2, current source I, is realized using a cascoded circuit (i.e., the NMOS version of the circuit in Fig. 8.32). The transistor WIL ratios are selected so that each operates at an overdrive voltage of 0.2 V. (a) What must the relationship of (WIL), to (W/L), be? (b) What is the minimum de voltage required across current source I, for proper operation? Now, if a 0.1-V peak-to-peak signal swing is to be allowed at the drain of Q,, what is the highest de bias voltage that can be used at that node? (c) What is the value of Vg of Q,, and hence what is the largest value to which V, can be set? (d) What is the minimum de voltage required across current-source I, for proper operation? (e) Given the results of (c) and (d), what is the allowable range of signal swing at the output? Ans. (a) (W/L), =4 (W/L),; (b) 0.2 V, 1.55 V; (c) 0.7 V, 0.85 V; (d) 0.4 V; (e) 0.4 V to 1.35 V %3D

D8.22 Consider the folded-cascode amplifier of Fig. 8.36 for the following case: Vpp = 1.8 V, k, = 4k, and V, = -V, = 0.5 V. To operate Q, and Q, at equal bias currents I, I, = 21 and I, = 1. While current source I, is implemented using the simple circuit studied in Section 8.2, current source I, is realized using a cascoded circuit (i.e., the NMOS version of the circuit in Fig. 8.32). The transistor WIL ratios are selected so that each operates at an overdrive voltage of 0.2 V. (a) What must the relationship of (WIL), to (W/L), be? (b) What is the minimum de voltage required across current source I, for proper operation? Now, if a 0.1-V peak-to-peak signal swing is to be allowed at the drain of Q,, what is the highest de bias voltage that can be used at that node? (c) What is the value of Vg of Q,, and hence what is the largest value to which V, can be set? (d) What is the minimum de voltage required across current-source I, for proper operation? (e) Given the results of (c) and (d), what is the allowable range of signal swing at the output? Ans. (a) (W/L), =4 (W/L),; (b) 0.2 V, 1.55 V; (c) 0.7 V, 0.85 V; (d) 0.4 V; (e) 0.4 V to 1.35 V %3D

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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