By Edward Alcosser, James P. Phillips, Allen M. Wolk
Tips on how to construct a operating electronic machine
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Extra info for How to Build a Working Digital Computer
The slowest responses are for a 1/4-W axial resistor, the two fastest for a chip component wired “casually” and in an optimized compact construction. varying from 25 to 50 ms. 13b looks a little more carefully and adds a further chip device measurement. Here I resoldered the chip as close as I could to opamp pin 2 and generally tidied up the wiring. The result is a further substantial reduction in rise time, down to as short as 5 ms. All this shows that performance does not require the use of fancy and expensive ampliﬁers.
So, how do we improve the detection performance of the LED transceiver? We showed above that the design cannot be shot-noise-limited, as the detected signal voltage is less than 2 kT/q, or 52 mV. How about increasing the load resistor RL to 1 GW? With the increase in load resistor, its thermal noise voltage has increased by a factor of 1000 = 32 times to 4 mV/ Hz, which seems like a retrograde step. However, the signal from the 100 pA photocurrent has increased by 100 times to 10 V. In the 20 MHz bandwidth the thermal noise of the resistor is 18 mV rms.