![]() This trigger pulse signal initiates a timing cycle which causes the output of the monostable to change state at the start of the timing cycle, ( t 1 ). Monostable multivibrators generate a single output pulse, either “HIGH” or “LOW”, when a suitable external trigger signal or start pulse T is applied. Monostable Multivibrators or “one-shot” pulse generators are generally used to convert short sharp pulses into much wider ones for timing applications. This simple type of RC Oscillator network is sometimes called a “Relaxation Oscillator”. These timing circuits are often used because of there simplicity and are also useful if a logic circuit once designed has some unused gates which can be utilised to create a monostable or astable oscillator. As NAND gates contain current amplification, they can also be used to provide a suitable clock signal or timing pulse with the aid of a single Capacitor and Resistor to provide the required feedback and timing functions. ![]() One way of producing a very simple clock signal (or pulse) is by the interconnection of digital logic gates. Bistable – A flip-flop that has TWO stable states producing a single pulse either HIGH or LOW in value.Monostable – A one-shot multivibrator that has only ONE stable state as once externally triggered it returns back to its first stable state.Astable – A free-running multivibrator that has NO stable states but switches continuously between two states this action produces a train of square wave pulses at a fixed known frequency.There are basically three types of clock pulse generation circuits: ![]() Combining two or more multivibrator circuit provides generation of a desired pattern of pulses (including pulse width, time between pulses and frequency of pulses). ( ƒ = 1/T )Ĭlock pulse generation circuits can be a combination of analogue and digital circuits that produce a continuous series of pulses (these are called Astable multivibrators) or a pulse of a specific duration (these are called Monostable multivibrators). Clock Frequency – the clock frequency is the reciprocal of the clock period, frequency = 1/clock period. ![]()
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