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| university:courses:electronics:electronics-lab-5fr [05 Mar 2019 11:07] – [Directions:] Antoniu Miclaus | university:courses:electronics:electronics-lab-5fr [23 Aug 2019 12:42] – Antoniu Miclaus |
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| 1 - small signal NPN transistor (2N3904)\\ | 1 - small signal NPN transistor (2N3904)\\ |
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| Note on the source resistor R<sub>S</sub> and the AWG output of the ADALM2000. The AWG output has a 50 Ω series output resistance and you will need to include it along with the external resistance in series with its output. Also because of the relatively high gain of your design you will need an input signal with a small amplitude of around 100mV. Rather than turning down the AWG in software it would be better from a noise point of view to insert a resistor voltage divider between the AWG output and your circuit input to attenuate the signal. Using something like that shown in figure 4 will provide both an attenuation factor of 1/8 and a 60Ω equivalent source resistance. Other combinations of resistor values are of course also possible based on what you have available. | Note on the source resistor R<sub>S</sub> and the AWG output of the ADALM2000. The AWG output has a 50 Ω series output resistance and you will need to include it along with the external resistance in series with its output. Also because of the relatively high gain of your design you will need an input signal with a small amplitude of around 100mV peak-to-peak. Rather than turning down the AWG in software it would be better from a noise point of view to insert a resistor voltage divider between the AWG output and your circuit input to attenuate the signal. Using something like that shown in figure 4 will provide both an attenuation factor of 1/8 and a 60Ω equivalent source resistance. Other combinations of resistor values are of course also possible based on what you have available. |
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| {{ :university:courses:electronics:afr_f4.png?400 |}} | {{ :university:courses:electronics:afr_f4.png?400 |}} |
