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
I WANT TO KNOW WHAT IS THE THORY OF PLOTTING V-I CHARACTERISTIC CURVE OF SILICON DIODE ???
Q For a three-phase, fully controlled, recti?er-fed, separately excited dc motor, corresponding to ideal no-load operation, find the expression for the no-load speeds. Comment on w
Subtract Registers and Borrow from Accumulator The contents of the register and borrow flag are subtracted from the contents of the accumulator and the result is store
Sectoral Overview and Enabling Framework Previously, you have studied about several Acts and Policies relevant to the power sector, their aims, main features and implications
A JFET for which V A = 80 V, V P = 4 V, and I DSS = 10 mA has a quiescent drain current of 3 mA when used as a common-source amplifier for which R D = R SS = 1k and R L = 3k
Architecture of 8085 Microprocessor The 8085 microprocessor is an 8 bit general purpose microprocessor. 8 bit processor means it can read write and process 8 bit data
(a) Describe why ordinary junction transistor is known as bipolar. (b) Describe working of NPN transistor as common Base configuration. Describe working of NPN transistor in
Multiplexed Address/ Data Bus Pins AD 7 - AD) are used for multiplexed address data bus. This bus is bidirectional input output and serves two purpose. Initially the bus
Get the equivalent inductance at terminal in circuit: Acquire the equivalent inductance at terminal AB in circuit shown in Figure. Solution Inductances also follow the
1. A 230/1000V 50 Hz, single phase transformer has the following test data: Open circuit test (L.V.) Primary voltage = 230V Primary current = 1.30 A Input power
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd