Consider the folded-cascode amplifier of Fig. 8.36 for the following case: VDD = 1.8 V

Chapter 8, Problem 8.22

(choose chapter or problem)

Consider the folded-cascode amplifier of Fig. 8.36 for the following case: VDD = 1.8 V, k n = 4k p, and Vtn = Vtp = 0.5 V. To operate Q1 and Q2 at equal bias currents I, I1 = 2I and I2 = I. While current source I1 is implemented using the simple circuit studied in Section 8.2, current source I2 is realized using a cascoded circuit (i.e., the NMOS version of the circuit in Fig. 8.32). The transistor W/L ratios are selected so that each operates at an overdrive voltage of 0.2 V. (a) What must the relationship of (W/L)2 to (W/L)1 be? (b) What is the minimum dc voltage required across current source I1 for proper operation? Now, if a 0.1-V peak-to-peak signal swing is to be allowed at the drain of Q1, what is the highest dc bias voltage that can be used at that node? (c) What is the value of VSG of Q2, and hence what is the largest value to which VG2 can be set? (d) What is the minimum dc voltage required across current-source I2 for proper operation? (e) Given the results of (c) and (d), what is the allowable range of signal swing at the output?

Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.

Becoming a subscriber
Or look for another answer

×

Login

Login or Sign up for access to all of our study tools and educational content!

Forgot password?
Register Now

×

Register

Sign up for access to all content on our site!

Or login if you already have an account

×

Reset password

If you have an active account we’ll send you an e-mail for password recovery

Or login if you have your password back