Calibrating method for current cells in a digital-analog converter circuit uses the current in a mirror transistor to form a cell current with a further current in a calibrating transistor

摘要

During an operating phase, a cell current (CC) is formed by the sum of a current in a mirror transistor (MT) (11) with a further current in a calibrating transistor (CT) (15) linked in parallel to the MT. The CC can be picked up on an output node point (1) for a current cell (10p). The CT is connected as a diode during a calibration phase. Independent claims are also included for the following: (A) A digital-analog converter circuit with current cells for generating an analog output signal by relying on an incoming digital signal; (B) and for a sigma-delta modulator circuit with a digital-analog converter circuit.