Digital logic design multiple choice questions pdf

In computer applications, where binary numbers are represented by only two symbols or digits, i.e.A binary number system is one of the four types of number system.The T flip flop may be obtained from a J-K flip flop by making both the inputs are the same i.e. The output will be the same as the previous state when the input is low.Ĭharacteristic equation: Q n+1 = TQ̅ n + T̅Q n The output of the T flip flop will be toggled when the input is high on every new clock pulse. The D flip flop may be obtained from a J-K flip flop by just putting one inverter between the J and K as shown in the figure below. The D flip flop may be obtained from an S-R flip flop by just putting one inverter between the S and R as shown in the figure below. The output of the D flip flop will be the same as the input. Obviously, other relevant information may be displayed on display as well.ĭ flip flop has only one input terminal. There is a digit for each decade the counter can display.

Each stage divides by ten and therefore as they are chained the first stage is the input divided by ten, the next is the input divided by 10 x 10, and so forth.ĭisplay: The display takes the output from the latch and displays it in a normal readable format. It has a set of divide-by-10 stages (a number equal to the number of display digits minus 1). For example, if the incoming signal was at 1 MHz and the gate was opened for 1 second, then 1 million pulses would be allowed through.Ĭounter/ latch: The counter takes the incoming pulses from the gate.

The resultant output from the gate is a series of pulses for a precise amount of time. Gate: The precisely timed gate enabling signal from the clock is applied to one input of a gate and the other has a train of pulses from the incoming signal. This is generated from the clock by dividing the clock signal by decade dividers and then feeding this into a flip-flop to give the enabling pulse for the main gate

Input: When the signal enters the frequency counter it enters the input amplifier where the signal is converted into a rectangular logic wave for processing within the digital circuitry in the rest of the counter.Īccurate time-base / clock: In order to create the various gate/timing signals within the frequency counter an accurate timebase or clock is required.ĭecade dividers and flip-flops: The clock oscillator is used to provide an accurately timed gate signal that will allow through pulses from the incoming signal.

Digital logic design multiple choice questions pdf