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| Basic circuit design, semiconductor devices, large and small signal models and analysis, amplifier and opamp circuits.
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Differential Amplifier with Digital Switch
For the final project, we were tasked with designing a differential amplifier. We used Cadence to layout our design
using Intel's 22nm PDK, and we submitted our tapeout to be manufactured. Our chips should be shipped sometime during the Spring 2025 semester.
Unfortunately, the Intel factory I was at this summer doesn't do legacy nodes like 22nm, so I wasn't able to see them in production.
Above is the full layout, and the subcomponents are detailed below.
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Design Spec |
Simulated Performance |
| Gain (@ 1MHz) |
>15 dB |
28 dB |
| Power Consumption |
<2 mW |
0.866 mW |
| Peak-to-peak output swing |
>200 mV |
630 mV |
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Differential Amplifier
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Code Checker
It isn't practical to have each student get a unique chip fabbed, so all of our designs share a bus with 4 digital inputs.
We each got a unique code so that we can turn on our differential amplifiers (mine was 1110). We can build this logic with
mosfets creating inverters and NAND gates.
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Passgate
Pass-gate switches allow your amplifier to be connected to the buses (i.e. GND, VDD, Input +, -)
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