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+disp('chapter 7 ex7.2')

+disp('given')

+disp('Design a precision full-wave rectifier circuit')

+disp('peak output Vo=2volt')

+Vo=2

+disp('input peak value Vi=.5volt')

+Vi=0.5

+disp('frequency f=1MHz')

+f=1*10^(6)

+disp('supply voltage Vcc=+or-15volt')  //(using bipolar op-amp)

+Vcc=15

+disp('I1>IBmax')

+disp('let I1=500*10^(-6)A')  //for adequate diode current

+I1=500*10^(-6)

+disp('R1=Vi/I1')

+R1=Vi/I1

+disp('ohms',R1)   //standard value

+disp('R2=2*R1')

+R2=2*R1 

+disp('ohms',R2)   //use two 1kohm resistors in series

+disp('R3=R1||R2')

+R3=R1*R2/(R1+R2)

+disp('ohms',R3)   //use 680ohm standard value

+disp('R4=R5=R1=1kohm')

+R4=1000

+R5=1000

+disp('for the output tobe 2volt when the input is 0.5volt')

+disp('R6=Vo/Vi*R5')

+R6=Vo/Vi*R5

+disp('ohms',R6)

+disp('use standard value R6=3.9kohm')

+R6=3900

+disp('R7=R4||R5||R6')

+R7=R4*R5*R6/(R4*R5+R5*R6+R6*R4)

+disp('ohms',R7) //use 470ohm standard value

+disp('For diode D1 and D2,Vr>30volt and trrmax=0.1microsec as in ex7.1')

+disp('Compensate A1 as a voltage follower')

+disp('A2 for gain of R6+R4||R5/(R4||R5)')

+A2=(R6+(R4*R5/(R4+R5)))/(R4*R5/(R4+R5))

+disp(A2)
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