Page 735 - SUBSEC October 2017_Neat

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02238020/CAPE SPEC/MS/2017

Question 2 KC UK XS

If R1 = 1.0k gain becomes - 100
1

(e) = - 100

The gain increases to 100 or by a factor of 10 (1). 1

1 3
Band width will be 1/10th as large since gain x BW is
constant = 1.585 kHz (1)

(iii)

(i) R- S flip flop (1)

(ii) NOR gate (1)

(iv) 3

Sequence R S Q Q’
1 0 1 1 0
2 0 0 1 0
3 1 0 0 1
(f) 4 0 0 0 1
(i) 5 0 1 1 0

6 0 0 1 0

The circuit is an R-S FLIP-FLOP (1). The present output is
determined by the previous value of the outputs and the 2
present values of inputs (1). 0-0 on the input is compatible
with any combination of outputs hence the output does not
change when 0-0 is asserted at the input (1).

The Half Adder

2

1