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Re: realization of sqrt(A^2+B^2) function using cmoscircuits
Sorry I do not have a paper reference. For me it is simple to straight develop circuits from written specs.
Proposed circuit:
1. Use the square priniple of MOS
2. Because you use a bipolar (cos,sin) as input you need to bias two MOS for each cos or sin. The bias should be near subthreshold and the device should be long channnel to get good square law.
3. The input should be cos, -cos, sin, -sin to four devices total. The output signal is the drain current of all four.
4. To get the square root there is a simple trick. You have to mirror the drain current of the four MOS. The 4:1 mirror output is feed to the drain of a MOS connected as diode. The voltage difference to the threshold bias point is your wanted squareroot.
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