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Linearly Tunable CMOS OTA With Constant Dynamic Range Using Source-Degenerated Current Mirrors

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2 Author(s)
Baruqui, F.A.P. ; Electron. Dept., Univ. Fed. do Rio de Janeiro ; Petraglia, A.

This brief introduces a new operational transconductance amplifier (OTA) that maintains the input voltage-swing constant during gm adjustments, enabled by employing current mirrors with source degeneration. The OTA presents a wide gm tuning range, which is linearly accomplished through a variable current source. The key design steps are illustrated through an example, and simulation results are included to validate the theory

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:53 ,  Issue: 9 )