Receiver circuit, particularly for mobile radio
AssigneeInfineon Technologies AG
InventorsMarkus Hammes, Stefan Heinen, Stefan Van Waasen, Andre Hanke, Elmar Wagner
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Abstract
In a receiver circuit for demodulating a high-frequency signal, a limiting amplifier stage with a downstream sigma-delta converter is connected in series with a mixer stage that transforms a high-frequency signal that is supplied at its input into an intermediate-frequency signal. The intermediate-frequency signal at the output of the limiting amplifier stage is value-discrete and time-continuous. The described receiver architecture has a high sensitivity, is substantially independent of production tolerances, and occupies a small area; therefore, it is particularly suitable for mobile radio applications.
Claims8
A receiver circuit, comprising:
- a mixer stage having an input for receiving a high-frequency signal to be demodulated, and an output outputting a complex-value intermediate frequency signal derived from the high-frequency signal;
- a limiting amplifier stage disposed downstream of said mixer stage, said limiting amplifier stage receiving the complex-value intermediate-frequency signal and having an output outputting a value-discrete, complex-value signal derived from the complex-value intermediate-frequency signal;
- a sigma-delta converter directly connected to said output of said limiting amplifier stage for converting the value-discrete, complex-value signal outputted by said limiting amplifier stage into a value-discrete and time discrete signal;
- and
- a polyphase filter for channel selection disposed between said mixer stage and said limiting amplifier stage.
Dependencies are inferred from the claim text.