SAMPLING FILTER DEVICE

摘要

There is provided a sampling filter device, the filter characteristic of which can be changed without using a complicated waveform as a control signal. The sampling filter device (100) comprises a controller (140), a plurality of integrators, and a plurality of switches. Input current is accumulated in a plurality of capacitors in response to a single clock signal, and the charges accumulated in the integrators from several clocks before to one clock before are added and outputted. When accumulating charges into the integrators in response to each clock signal, switching the input current makes it possible to weigh and add the charges to be outputted, so the filter characteristic changes.