Variable dynamic range receiver

摘要

Embodiments of the present invention may provide a signal processing circuit that may comprises an analog-to-digital converter (ADC), and an output restriction circuit. The output restriction circuit may reduce the accuracy of the digital output of the ADC when signal content exceeds a pre-determined spectrum mask in an undesirable band. In one embodiment, the input signal spectrum may be actively monitored and when the input spectrum is inconsistent with an intended application, the output resolution may be restricted, for example, by truncating least significant bits (LSBs) of the digital output or adding digital noise.

主权项

1. A signal processing circuit, comprising:
an analog-to-digital converter (ADC) receiving an analog signal and providing a digital signal, and an output restriction circuit:
receiving the digital signal from the ADC;having a pre-determined spectral mask defining an in-band region and an out of band region of the digital signal; andadjusting a resolution of the digital signal while providing a maximum bandwidth of the digital signal by:
providing a full resolution of the in band region of the digital signal andrestricting a resolution of the out of band region of the digital signal by reducing a content level of the digital signal in the out of band region when the content level of the digital signal exceeds a level defined in the pre-determined spectral mask in the out of band region.