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US 7,126,424 B2Granted
Interface circuit for connecting to an output of a frequency converter
AssigneeInfineon Technologies AG
InventorsPeter Klein, Bernhard Lustig, Dieter Sewald
Life of this patent
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Abstract
In an interface circuit for connection to an output of a frequency converter, at least two current paths are coupled to one another in parallel. Each current path includes at least one cascode stage for signal processing. The circuit compensates for DC voltage offsets of the frequency converter, and has a gain ratio that can be changed over for signals with a large dynamic range.
Claims19
An interface circuit for connection to an output of a frequency converter, comprising:
- a signal input;
- a signal output;
- a first current path, which couples the signal input to the signal output and comprises at least one cascode stage;
- a second current path, which comprises a cascode stage connected in parallel with the cascode stage of the first current path;
- one of the first and second current paths having a connection for receiving a common-mode signal;
- and
- a third current path, which comprises a cascode stage coupled in parallel with the cascode stages of the first and second current paths, the cascode stages in the second and third current paths each having a control input connected to a bias stage that is operable for changing over between the second and third current paths.
4 more elements
Dependencies are inferred from the claim text.