Circuit, use, and method for controlling a receiver circuit
AssigneeAtmel Corporation
InventorsUlrich Grosskinsky, Werner Blatz
Life of this patent
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Abstract
A circuit, use, and method for controlling a receiver circuit is provided, wherein a complex baseband signal is generated from a received signal, a phase difference between a phase of the complex baseband signal and a phase precalculated from previous sampled values is determined, the phase difference is compared with a first threshold, a number is determined by counting the exceedances of the first threshold by the phase difference, a number of the counted exceedances is compared with a second threshold, and the receiver circuit is turned off if the number of counted exceedances exceeds the second threshold within a time period.
Claims10
A circuit comprising:
- a receiver circuit configured to receive a modulated signal;
- a control unit configured to control the receiver circuit, the receiver circuit configured to output a phase difference between a phase of a complex baseband signal and a phase precalculated from previous sampled values;
- an evaluation circuit, which for evaluating the phase difference is connectable to the receiver circuit and the control unit, the evaluation circuit being configured to compare the phase difference with a first threshold and configured to output an output signal based on a number of exceedances of the first threshold by the phase difference, wherein the control unit is configured to turn off the receiver circuit based on the output signal of the evaluation circuit;
- wherein:
- the evaluation circuit has a control input for setting the first threshold;
- and
- the evaluation circuit has a first comparator, which is formed with the receiver circuit or with the output of a subtractor for comparing the phase difference with the first threshold, wherein the evaluation circuit has a counter configured to determine the number of exceedances, the counter being configured to count a clock signal as a function of an output signal of the first comparator, and wherein the evaluation circuit has a second comparator, which is configured to compare the number determined by the counter with a second threshold and an output of the output signal based on the comparison result of the evaluation circuit.
An apparatus, comprising:
- circuitry configured to:
- receive a modulated signal;
- output a phase difference between a phase of a complex baseband signal and a phase precalculated from previous sampled values;
- compare the phase difference with a first threshold;
- increment a counter in response to determining that the phase difference exceeds the first threshold;
- compare an output of the counter with a second threshold;
- and
- turn off a receiver circuit in response to determining that the output of the counter exceeds the second threshold;
- wherein the circuitry comprises an evaluation circuit comprising:
- a first comparator configured to compare the phase difference with the first threshold;
- the counter, wherein the counter comprises an input connected to a clock signal, the counter configured to count pulses of the clock signal when the phase difference exceeds the first threshold;
- and
- a second comparator configured to compare the output of the counter with the second threshold.
Dependencies are inferred from the claim text.