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21. Ipss = 20 mA and Vgs(off) = –-6 V for a particular JFET. %3D (a) What is Ip when Vcs = 0 V? (b) What is Ip when VGs = VGs(off? (c) If Vcs is increased from -4 V to –1 V, does I, increase or decrease?

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2. Given the problem:

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Ex. 1913. An A/D-current integrated circuit has a 5-bits and has resolution of an input range of 5mA to 19mA. digital-output value for 15.450 mA input, and also current resolution (i.e. mA per A/D count). Current range divided by 2^5 is an approximate calculation of current resolution. Calculate the Calculate the approximate current resolution and the positive difference between the two. ans:4

For the system shown: a. Get the equations b. Simplify and determine C/R c. Draw the signal flow diagram for this system. H3 Z3 m1 R E E1 G1 G2 G3 G4 m n H2 Z1 22 H1

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TO SOLVE THE BULLET GIVEN YOU NEED TO FOLLOW/GUIDE THE EXAMPLE #1

2. You are to design an astable Multivibrator (clock source) using a 555 timer IC with the following specifications: frequency = 100 kHz, and duty cycle = 75%. Use a capacitor that is twice the minimum required for the IC. Determine the period, T, and then the values oft, and t, based on the frequency and duty cycle. What is the capacitance (C) based on the 2x the minimum for the IC? Calculate the value of R, using the design equation below and your values of t, and C. Calculate the value for R, using the second design equation. Xsci Vcc Ext Teg R1S T= ti +t Frequency = 1/T; Duty Cycle = (t /T) 100% CLOCK R2 $ 13 OUT For Design: ti = 0.693-R2-C;t = 0.693(R: + R:)-C R: 2 1ka, C2 500pF, R: + R2 s 6.6M2 TH U3 555 TIMER_RATED TRI CON GND

De fine time constant (I) for (R-L) cct.

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