| 摘要 |
Various embodiments of readout circuits are disclosed where no touchscreen or touch panel recharge is required, and the amount of time available for signal acquisition is twice that relative to prior art touchscreen or touch panel readout circuits. Voltage offsets of the integrating amplifiers may be compensated for by notch filtering signals stored in readout circuit capacitors. Some embodiments of readout circuits disclosed herein permit large dynamic range capacitive touchscreen or touch panel signals to be processed, and do not require panel reset. Readout circuits are disclosed that permit doubling of the signal acquisition rate and pre-filtering of acquired touch panel signals for improved immunity from harmonic EMI. Signal acquisition and temporary storage may be carried out using the same capacitors in such readout circuits. |
