A data processor comprising: a data processing module comprising: an input for receiving an input signal; an output for providing a quantized output signal; a combining unit configured to combine, in a feedback loop, a feedback signal from the output with the input signal; and a quantizer configured to provide the quantized output signal based on the combined signal and a clock signal, and a correction module provided outside of the feedback loop of the data processing module, the correction module comprising: a full-scale quantizer configured to receive the quantized output signal of the quantizer of the data processing module and to provide a full-scale output representative of a digital signal with at least reduced metastability error; a first digital-to-analogue converter configured to provide an analogue representation of the quantized output signal; a second digital-to-analogue converter configured to provide an analogue representation of the full-scale output of the full-scale quantizer; an analogue combining circuit configured to provide an analogue representation of the metastability error based on the analogue representations (546, 550) of the quantized output signal and full-scale output; an analogue delay unit configured to delay signal propagation between the first digital-to-analogue converter and the analogue combining circuit in order to provide the analogue representations (546, 550) of the quantized output signal and full-scale output in phase at the analogue combining unit; a metastability error quantizer configured to provide a digital representation of the metastability error based on the analogue representation of the metastability error; and a digital combining circuit configured to provide a metastability corrected output signal based on the full-scale output and the digital representation of the metastability error. a data processing module comprising: an input for receiving an input signal; an output for providing a quantized output signal; a combining unit configured to combine, in a feedback loop, a feedback signal from the output with the input signal; and a quantizer configured to provide the quantized output signal based on the combined signal and a clock signal, and an input for receiving an input signal; an output for providing a quantized output signal; a combining unit configured to combine, in a feedback loop, a feedback signal from the output with the input signal; and a quantizer configured to provide the quantized output signal based on the combined signal and a clock signal, and a correction module provided outside of the feedback loop of the data processing module, the correction module comprising: a full-scale quantizer configured to receive the quantized output signal of the quantizer of the data processing module and to provide a full-scale output representative of a digital signal with at least reduced metastability error; a first digital-to-analogue converter configured to provide an analogue representation of the quantized output signal; a second digital-to-analogue converter configured to provide an analogue representation of the full-scale output of the full-scale quantizer; an analogue combining circuit configured to provide an analogue representation of the metastability error based on the analogue representations (546, 550) of the quantized output signal and full-scale output; an analogue delay unit configured to delay signal propagation between the first digital-to-analogue converter and the analogue combining circuit in order to provide the analogue representations (546, 550) of the quantized output signal and full-scale output in phase at the analogue combining unit; a metastability error quantizer configured to provide a digital representation of the metastability error based on the analogue representation of the metastability error; and a digital combining circuit configured to provide a metastability corrected output signal based on the full-scale output and the digital representation of the metastability error. a full-scale quantizer configured to receive the quantized output signal of the quantizer of the data processing module and to provide a full-scale output representative of a digital signal with at least reduced metastability error; a first digital-to-analogue converter configured to provide an analogue representation of the quantized output signal; a second digital-to-analogue converter configured to provide an analogue representation of the full-scale output of the full-scale quantizer; an analogue combining circuit configured to provide an analogue representation of the metastability error based on the analogue representations (546, 550) of the quantized output signal and full-scale output; an analogue delay unit configured to delay signal propagation between the first digital-to-analogue converter and the analogue combining circuit in order to provide the analogue representations (546, 550) of the quantized output signal and full-scale output in phase at the analogue combining unit; a metastability error quantizer configured to provide a digital representation of the metastability error based on the analogue representation of the metastability error; and a digital combining circuit configured to provide a metastability corrected output signal based on the full-scale output and the digital representation of the metastability error.