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Could a MOSFET based device be used to build something like a stepped attenuator?
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<blockquote data-quote="Rob Timmerman" data-source="post: 208607" data-attributes="member: 172"><p>Digitally-controlled potentiometers are available, although they might not be suitable for your application. </p><p>If you look at how a MOSFET is constructed, the relationship between resistance and capacitance should make sense: you get lower resistance by increasing the active area, which increases the capacitance.</p><p>If your application actually requires contact-based switching, it's probably worth sitting down and sketching out the required relay logic - you should be able to build a 16-level stepped attenuator with 4 SPDT relays and some well-chosen resistors.</p></blockquote><p></p>
[QUOTE="Rob Timmerman, post: 208607, member: 172"] Digitally-controlled potentiometers are available, although they might not be suitable for your application. If you look at how a MOSFET is constructed, the relationship between resistance and capacitance should make sense: you get lower resistance by increasing the active area, which increases the capacitance. If your application actually requires contact-based switching, it's probably worth sitting down and sketching out the required relay logic - you should be able to build a 16-level stepped attenuator with 4 SPDT relays and some well-chosen resistors. [/QUOTE]
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Could a MOSFET based device be used to build something like a stepped attenuator?
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