Digital analog convertor with programmable amplification using a current to voltage convertor

摘要

The digital to analog convertor converts a digital input signal into an analog output signal. The D/A convertor (1) has a signal input (2) for the digital input signal. A reference current source (7) generates a reference current whose amplitude can be adjusted by a setting terminal (4) of the DAC (1). A current mirror circuit reflects the generated reference current by a corresponding ratio into a reflected current. A controllable switch device switches the reflected current in dependence on the input signal, through to a current summing node to generate a summed current. A current to voltage convertor (17) converts the summed current to a corresponding voltage which is output as an analog signal.