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A low-sensitivity programmable BJT current-mode filtering technique

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1 Author(s)
Mathiazhagan, C. ; Dept. of Electr. Eng., Indian Inst. of Technol., Madras, India

A low-sensitivity temperature-compensated programmable BJT current-mode low-voltage filtering technique is proposed. We introduce a new technique in which the DC gain and the location of the second pole of the integrator are controlled such that the Q-enhancement, due to the second pole, is cancelled by the effect of finite DC gain. The technique is suitable for integration and can work with low-value capacitors. By making the filter time constant exactly proportional to reC, good linear tunability is achieved over many decades. The programming current is varied as proportional to absolute temperature (PTAT) to stabilize the time constant reC

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Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:46 ,  Issue: 9 )