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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.

All rights reserved. Any use is subject to the Terms of Use as given at the website. 3 Noise contributions of a detector plus bias box. 6 Bias Box Noise It is useful to estimate the detection noise and performance of the simple bias box system described in Chap. 2. 6 mm2) operated with either 1 kW or 1 MW resistors at a 9 V reverse bias (Fig. 3). The noise sources to be considered are the thermal noise of the resistive load, the shot noise of the leakage current, and the shot noise of the signal photocurrent.

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.

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