Analysis and Performance Comparison of Charge Transfer Circuits for Capacitive Sensing

Provided by: AICIT
Topic: Hardware
Format: PDF
In this paper, the authors analyze and compare four different types of capacitive sensor based on charge transfer circuit. The sensors are based on a passive charge transfer circuit, a parasitic-sensitive discrete-time integrator, a parasitic-insensitive discrete time integrator, and a passive-style charge transfer circuit with active output voltage feedback. To verify the theory, a simple lumped and a 20x20 cell touch screen panels modeled with RC circuits are used in simulation. A touch cell with 20% of capacitance variation between touch and non-touch states is assumed for the simulation.

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