The Q1-Q2-pair of Fig. P4.89 is active-loaded by the emitter-degenerated mirror pair Q3-Q4 and is biased by the Wilson mirror Q5-Q6-Q7. Let the BJTs have VBEn 5 VEBp 5 0.7 V, VCEn(EOS) 5 VECp(EOS) 5 0.3 V, 0p 5 250, and VAn 5 2VAp 5 80 V. (a) Find Rid, Ro, adm, and CMRR. (b) If the input terminals are tied together and driven by a common voltage vIC, fi nd the permissible range for vIC. What is the permissible output voltage range if vIC 5 0 V? (c) What are the advantages/disadvantages of using emitter degeneration in the active load? Of biasing the circuit via a Wilson mirror instead of a basic mirror?
Already registered? Login
Not Account? Sign up
Enter your email address to reset your password
Back to Login? Click here