US 6,285,305 B1Granted

Analog-to-digital converter circuit

AssigneeSiemens Aktiengesellschaft

InventorsPeter Feld, Horst Kroeckel, Markus Vester

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Abstract

An analog-to-digital converter circuit has pre-sample and hold circuit for acquiring and temporarily storing a supplied analog input signal, and for outputting the temporarily stored input signal, at least two signal paths, which are arranged downstream relative to the pre-sample and hold circuit and which are switched in parallel with one another, the temporarily stored input signal sample from the pre-sample and hold circuit being subjected to respective fixed amplifications, which are different from one another, in said signal paths and a selection circuit arranged downstream relative to the signal paths for through-connecting only one of the signal paths, dependent on the respective signal levels, to an analog-to-digital converter that is arranged downstream relative to the selection circuit.

Claims10

Dependent claims

An analog-to-digital converter circuit comprising:

a pre-sample and hold circuit supplied with an analog input signal, said pre-sample and hold circuit temporarily storing said input signal and emitting a temporarily stored input signal;
a first signal path and a second signal path connected in parallel downstream from pre-sample and hold circuit and each being supplied with said temporarily stored input signal, said first signal path having a first amplification factor and said second signal path having a second amplification factor different from said first amplification factor;
a switch having a first input connected to said first signal path and a second input connected to said second signal path and an output;
a level detection circuit for operating said switch to through-connect one of said first signal path and said second signal path to said output of said switch dependent on a signal level in one of said first signal path and said second signal path;
and
an analog-to-digital converter having an input connected to said output of said switch.

3 more elements

Dependencies are inferred from the claim text.