Patent ID: 6195031
Filing Date: 2001-02-27
Classification: H03M

Abstract:
An analog-to-digital converter circuit for converting a high-frequency analog signal, having large dynamics between low amplitudes and high amplitudes, into a digital output signal, comprising:a first analog-to-digital converter and a second analog-to-digital converter connected in parallel, said input signal being supplied to each of said first and second analog-to-digital converters and each of said first and second analog-to-digital converters inherently having a distortion associated therewith, each of said analog-to-digital converters having an output;a switch having inputs respectively connected to said outputs of said first and second analog-to-digital converters, and having a switch output;a level converter connected preceding one of said first and second analog-to-digital converters and supplied with said input signal;a level recognition element for identifying a level range in which said input signal lies and for generating a control signal dependent on said level range, said control signal being supplied to said switch and causing said switch to be set to connect a respective one of the outputs of said first and second analog-to-digital converters to said switch output; anda correction memory having memory inputs connected to said switch output, and also supplied with said control signal, said correction memory containing datasets for respectively correcting for the distortion in each of said first and second analog-to-digital converters, each of said datasets containing address values at respective, different addresses, and said control signal addressing an address value of said correction memory for the dataset corresponding to the analog-to-digital converter connected to said switch output and causing the addressed address value to be emitted from said correction memory as a part of said digital output signal to correct for said distortion.