EE40 42 100 Practice MOSFET Problems Problems 4 6 are for EE40 only though EE42 100 students may want to try to find the Q point for each of these questions 1 VDD C A B Out A C B What logic function does this CMOS gate perform Draw a truth table and write an expression in sum of products form 2 Draw a CMOS circuit for the function Out AB A C Where X means the inversion of X 3 Analyze the following NMOS circuit K 1mA V2 and Vto 1V a Using KVL write the equation of Ids as a function of Vds b Draw the load line on the following diagram c Using equations for a NMOS transistor find VGSQ IDSQ and VDSQ Confirm answers through the load line above 4 a The NMOS transistor in the source follower circuit of Fig a has gm 5mA V and rd is infinity Find the open circuit voltage gain and the output resistance b The NMOS transistor in the common gate amplifier of Fig b has gm 5mA V and rd is infinity Find the input resistance and voltage gain c If the output of the source follower in a is connected to the input of the common gate amplifier in b use the results of a and b to obtain the over all voltage gain Hint Voltage gain is affected by the load resistance Consider the load effect for cascaded circuits 5k v i vo1 10k Fig a 5 Hambley P12 48 2k vi2 10k Fig b v o 6 Hambley P12 45 But use 10M for both R1 and R2 and 20k for RL rd is not equal to infinity anymore Do consider the effect caused by rd Hint The transistor might not operated in the saturaion regime Think about how you can find out rd from the definition eq 12 31
View Full Document
Unlocking...