Device comprising an electronic circuit for processing an analog signal

摘要

The device (1) comprises an electronic circuit (2) for processing an analog signal and a voltage multiplying (or boosting) circuit (3) for providing the supply voltage (Ua) to the electronic circuit (2) from the voltage (Up) supplied by a cell (P). The device (1) moreover comprises means (4) that respond to the supply voltage (Ua) to vary the internal resistance (R) of the electronic circuit (2) in inverse ratio to the supply voltage (Ua). This variation in the internal resistance (R) of the electronic circuit (2) brings about a limitation in the variations of the supply voltage (Ua) in dependence on the voltage (Up) supplied by the cell (P) and on the current consumed by the electronic circuit (2). The device is meant to be used in portable apparatus of small size such as hearing aids.