What is reason behind the name ‘Twisted ring counter’?
OR
How the
Johnson counter is constructed?
Twisted ring counter
The twisted counter is constructed by using serial in serial out shift register. The Q output of each stage is connected to the D input of the next stage but the output Q bar of the last stage is connected to the D input of the first stage therefore it is called as twisted ring counter.
How many states and pulses counted
by n flip flop Johnson counter?
OR
Why the
Johnson counter is called as Mod – 2n counter?
Mod – 2n counter
An N flip flop Johnson counter can count up to
2n pulses and 2n unique states therefore it is called as mod – 2n counter.
Why the Johnson counter is lies
between ring counter and ripple counter?
Johnson counter
The Johnson counter lies between ring counter
and ripple counter because the Johnson counter requires more decoding circuit
than that of ring counter whereas it requires less decoding circuit than by the
ripple counter.
Which type of counter suffers from problem of lock out?
Ring counter and Johnson counter
How the
problem of lock out can be corrected in the ring counter?
Lock out
The lock out problem in
the ring counter is corrected by using adding AND gate. If the counter find
itself is in the unused state, the counter finds its way to used state after
number of clock pulses.
Describe
the function of the pulse train generator.
Function
of Pulse train generator
The function of the Pulse train generator is
to generate prescribed sequence of logic bits.
Which type of logic is used for Pulse
train generator?
Direct logic or indirect logic
Describe the advantage of Pulse train using indirect logic.
Advantage of Pulse train using Indirect Logic
The advantage of pulse train using indirect
logic is that any counter with correct number of states can be formed by the
pulse train generator.
Which logic device is used to generate only the single
pulse train?
Shift registers
Which condition must be satisfied for
sequence generator generates a sequence of length L using n flip flops?
L
≤ 2n – 1
How the pulse generated by using shift registers?
Pulse generator
There are N flip flops
are connected in cascade similar to that of in a shift register. The clock
pulse is applied to each flip flop. The output of each flip flop is connected
to input D of the first flip flop via combinational logic circuit. The
prescribed sequence of pulse appears at the output of each flip flop.
How many
numbers of flip flops require for N states pulse generation using shift
registers?
The minimum number of
flip flops require for N state pulse generation using shift register such that
N < 2n
N = Number of state and
n = Number of flip flops
Describe
the disadvantages of pulse generator using shift register.
It is very difficult to
generate unique states by pulse generator using shift register.
Explain the
term : Linear sequence generator
Linear
sequence generator
It is a pulse sequence generator which can
generate 2n – 1 unique state for n flip flops shift registers. It
will generate all states except zero state.
How many unique states that can
be generated by linear sequence by using n flip flop shift register?
2n – 1
Explain : Full modulus cascading
Full modulus cascading
The cascading of counter is full modulus if
the overall modulus is the product of the individual moduli of all the cascaded
counters.
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