Device and method for efficient digital-analog conversion

A device for converting a digital input signal into an analog output signal, comprising:

• a first digital to analog converter configured to generate a first analog signal from the digital input signal;
• a second digital to analog converter configured to generate a second analog signal from the digital input signal;
• a signal splitter configured to couple out a feedback signal from the second analog signal, wherein the feedback signal has a lower power with regard to the second analog signal;
• a first signal combiner configured to generate an error signal by subtracting the feedback signal from the first analog signal;
• a phase aligner configured to adjust a phase of the error signal;
• and
• an amplitude aligner configured to adjust an amplitude of the error signal or a signal derived from the error signal;
• and
• wherein the second digital to analog converter is configured to operate at a higher output power than the first digital to analog converter,
• wherein the first digital to analog converter is configured to be inefficient but accurate and the second digital to analog converter is configured as being efficient but error-prone,
• wherein the efficient but error-prone second digital to analog converter is configured for generating a bulk of the analog output signal and the inefficient but accurate first digital to analog converter is configured for correcting errors to generate the analog output signal with a high efficiency, high power and high quality,
• wherein a power ratio of 1% of the second analog signal is present within the feedback signal, and
• wherein the second digital to analog converter is a one-bit switched converter.