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| capacitor [2012/06/30 19:32] – q mcmaster | capacitor [2012/06/30 19:32] – mcmaster |
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| Capacitors are essentially very large gates. Say for example that one wants a capacitor to ground. In a metal gate CMOS process this can be done by simply creating a well and putting a large M1 over the well. For example, if one wants a capacitor to ground, you could create a large P well and then put metal on top. The P well is connected to ground and M1 to the desired connection. Example metal gate CMOS capacitor: | Capacitors are essentially very large gates. Say for example that one wants a capacitor to ground. In a metal gate CMOS process this can be done by simply creating a well and putting a large M1 over the well. For example, if one wants a capacitor to ground, you could create a large P well and then put metal on top. The P well is connected to ground and M1 to the desired connection. Example metal gate CMOS capacitor: |
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| {{:mcmaster:capacitor:metal_gate_st_24c02_hf2.jpg|}} | {{:mcmaster:capacitor:metal_gate_st_24c02_hf2.jpg?300|}} |
| {{:mcmaster:capacitor:metal_gate_st_24c02_hf1.jpg|}} | {{:mcmaster:capacitor:metal_gate_st_24c02_hf1.jpg?300|}} |
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| Note the much smaller gate capacitors below. It seems to me these capacitors as above would be isolated but M2 tied them together in parallel. I am not clear why. | Note the much smaller gate capacitors below. It seems to me these capacitors as above would be isolated but M2 tied them together in parallel. I am not clear why. |
