A capacitance multiplier based on DBTA

Abstract

The Design of integrated circuits uses the Capacitance Multipliers for the realization of large-valued on-chip capacitances. The capacitance multiplier can save the valuable space on the chip in exchange for use one active element and two grounded passive components. The final multiplied capacitance is bigger than one real on-chip capacitance, moreover, the smaller on-chip space is required. The proposed circuit connection uses one active element called DBTA (Differential Input Buffered and Transconductance Amplifier) and two passive grounded component — one resistor and one capacitor whose capacitance is finally multiplied. The transconductance of DBTA or value of the resistor can control the multiplication factor. The active element is composed of current feedback amplifiers for test reasons. The verification of this proposal is ensured by SPICE simulations.