Pulse-width programmable gain integrating amplifier

An architecture of a programmable gain integrating amplifier is presented. The circuit operates using two clock phases for sampling and amplification and the gain is defined by the ratio between the pulse-width of a control signal and the integrator time constant, which is defined by a resistor and capacitor. The proposed architecture also has configuration switches that enable its use in the modes differential, direct single-ended or with DC adjustment and calibration. Simulation and experimental results from a developed circuit prototype are presented.