Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
One of the simplest circuits is the asynchronous or ' ripple' counter. Below is shown the circuit diagram of a simple 3 stage ripple counter.
The operation of this circuit is based on the fact that the truth table for the JK flip flop is only valid if the clock waveform is falling, i.e. 1->0. Assume the outputs are all zero, the flip flops will not change until the clock on each flip flop falls. The clock in waveform has just fallen ,since the JKa inputs are logic '1' the device will toggle and the output will invert i.e. Qa=1. Flip flop B will not change because the clock waveform on B has risen (0->1) and these devices only functions on a falling edge. The clock in waveform has fallen again, so Qa toggles again (i.e. Qa =0), this has just produced a falling clock on JKb and Qb toggles (i.e. Qab=1) .The device has just counted from 000-> 001->010.
The circuit is called a ripple counter because the clock pulse is slowly rippling through the JK's, hence asynchronous (Not at the same time!) .The limitations of the asynchronous counter is the speed of operation. A rough formula for the maximum speed is when the clock changes before the output changes i.e. F = 1 / n x propagation delay where n = number of stages, propagation delay of one JK
A better technique is to use a synchronous design where all the JK are clocked together so the maximum frequency is only limited by the propagation delay of 1 JK.
The circuit appears to be complex in design, however it is easily realised by using state diagrams. The maximum frequency of operation is again roughly calculated by considering the frequency at which the output just changes before the clock in changes. F = 1/ Propagation delay
For Parity Flag CPRE (Call on parity even) and CPO (Call or parity Odd) Instruction CPE calls the subroutine from the specified memory location if parity flag is
Question 01 Convert the following binary numbers to its specified number system 111.101 (2) to octal 10111 (2) to decimal 0.1010 (2) to hexadecimal 1011.11 (2)
Explain the Bidirectional Shift Registers? A Reversible or A Bidirectional shift register is one in which the data can be shift either left or right. D flip-flops are used by
Q. Explain the drain and transfer characteristics of P-channel enhancement MOSFET. In p-channel enhancement MOSFET here is a n-type substrate and p doped regions under drain an
transistor biasing stabilization problems
hi, i want to know the transfer function of a radiator
Q. Explain working of Common drain amplifie? When an ac signal drives the gate of JFET, it produces an ac drain current. It flows through Rs and produces an ac output voltage t
Q. What are the supplementary services? new services are called supplementary services and some of the prominent ones are as below: Category 1: Abbreviateddialling
1. Find the current through each component, in polar form, using mesh analysis. The source voltages are rms with an angle of 0 degrees. 2. Find the current t
Q. Consider the op-amp circuit shown in Figure and obtain expressions for the open-loop voltage gain at (a) low and (b) high frequencies. Also determine relations for the 3-dB poin
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd