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Extra resources for Nuclear Electronics Laboratory Manual (IAEA TECDOC-530)

Sample text

Note that in this case the gains are all less than one. This circumstance permits you to assign the binary value of 1 to the positive supply voltage and the binary value of 0 to ground. There are then four different possible input combinations, (0,0), (0,1), (1,0), and (1,1). Record the output voltage for each of these inputs. How could you make this circuit into a three bit D to A converter? (Note: you will nave to change the overall gain of the circuit. ) Estimate the largest number of digital bits that a circuit of this type will accommodate.

1. The information about the energy of the registered radiation is the height of the separate steps of the staircase voltage. A typical step height is a few tens of milivolts, and the staircase voltage range is from -5 V to + 5 V. Such voltage can not be amplified without overloading the amplifier. Therefore the staircase voltage is differentiated. 2. Due to the nonexact differentiation performed by the RC differentiator, the resulting pulses are followed by the exponential curve approaching zero with the time constant RC.

Estimate the largest number of digital bits that a circuit of this type will accommodate. Remove all inputs but one. Observe the pulse response of the operational amplifiers LF355, LF356, and 741 in this circuit. 5 /*s to 10 /is. Very sharp input pulses will be smoothed due to insufficient gain at high frequencies. The effect will be more pronounced if the gain is increased to 100 by replacing the feedback resistor of 5K6 with a 1M resistor. 3 INTEGRATOR WITH RESET The operation of an active integrator is demonstrated by using dc and rectangular input signals.