access icon free Effects of imbalance input on linearity of pseudodifferential ladder Gm-C filters

© The Institution of Engineering and Technology
Received 31/07/2012, Accepted 19/01/2013, Revised 26/12/2012, Published

This study presents distortion analysis of the fully differential Gm-C filters in which the imbalance of the differential input voltages is taken into consideration. Closed-form equations expressing distortions of differential-mode (DM) output voltages as functions of DM and common-mode input voltages are developed. It was found that the HD3 of the DM output voltage is independent of the input imbalance. On the contrary, the HD2 of the DM output voltage is directly dependent upon the input imbalance. Simulation results are shown to be in good agreement with the analytical results.

Inspec keywords: ladder filters

Other keywords: common-mode input voltage; differential input voltages imbalance; HD3; fully pseudodifferential ladder Gm-C filter; HD2; closed-form equation; imbalance input effect; distortion analysis; differential-mode output voltage; DM

Subjects: Filters and other networks

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