Electronic envelope detection circuit and corresponding demodulator
AssigneeSTMicroelectronics S.r.l.
InventorLionel VOGT
Life of this patent
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Abstract
An electronic envelope detection circuit includes an input signal detecting circuit having at least one MOS transistor configured to receive a radiofrequency input signal and to deliver an internal signal on the basis of the input signal. The biasing point of the at least one transistor is controlled by the input signal and a control signal. A processing circuit that is coupled to the input signal detecting circuit is configured to deliver a low-frequency output signal on the basis of the internal signal and further deliver the control signal on the basis of the output signal. In operation, the value of the control signal decreases when the average power of the input signal increases, and vice versa.
Claims18
An electronic envelope detection circuit, comprising:
- an input signal detecting circuit having at least one MOS transistor having a control terminal configured to receive a radiofrequency input signal and generate an internal signal in response to the input signal, wherein the at least one MOS transistor has a biasing point, and wherein the biasing point is controlled by the input signal and a control signal;
- and
- a processing circuit having an input configured to receive the internal signal generated by the input signal detecting circuit and configured to generate a low-frequency output signal in response to the internal signal, wherein the processing circuit is further configured to generate the control signal in response to the low-frequency output signal;
- wherein a value of the control signal decreases in response to an increase in an average power of the input signal, and vice versa.
Dependencies are inferred from the claim text.