Multiplier circuit with offset compensation and quadricorrelator
AssigneeInfineon Technologies AG
InventorElmar Wagner
Life of this patent
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Abstract
A multiplier circuit has an analog multiplier with two signal inputs. A respective switching device is connected to each one of the two signal inputs of the analog multiplier for periodically reversing the polarity of the input voltages. A clock signal that can be fed to the switching devices has a changeover frequency that is preferably greater than or equal to twice the useful signal frequency. This suppresses offset-governed crosstalk of the input signals to the output of the analog multiplier. This principle can also be employed in quadricorrelators.
Claims8
A multiplier circuit with offset compensation, comprising:
- an analog multiplier including a first signal input for receiving a first signal, a second signal input for receiving a second signal, and an output for providing a multiplied signal;
- a first switching device for polarity reversal, said first switching device connected to said first signal input;
- and
- a second switching device for polarity reversal, said second switching device connected to said second signal input.
A quadricorrelator, comprising:
- a first signal path;
- a second signal path;
- a first analog multiplier located in said first signal path, said first analog multiplier including an output and two inputs;
- a second analog multiplier located in said second signal path, said second analog multiplier including an output and two inputs;
- a differential node connected to said output of said first analog multiplier and to said output of said second analog multiplier;
- a first switching device for periodically reversing a polarity of a signal selected from the group consisting of a quadrature component of a signal and a signal derived from the quadrature component of the signal and for thereby providing a first quadrature component signal, said first switching device connected to said two inputs of said first analog multiplier for supplying the first quadrature component signal thereto;
- and
- a second switching device for periodically reversing a polarity of a signal selected from the group consisting of another quadrature component of the signal and a signal derived from the other quadrature component of the signal and for thereby providing a second quadrature component signal, said second switching device connected to said two inputs of said second analog multiplier for supplying the second quadrature component signal thereto.
Dependencies are inferred from the claim text.