System and method for detecting Radio Frequency signals over a range of powers
AssigneeCisco Technology, Inc.
InventorsJohn M. Blosco, James Julius Nahra
Life of this patent
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Abstract
The present invention is directed to a power detection circuit for use in a wireless transmitting device. The circuit makes use of multiple gain paths so that two or more scaling factors are provided. Each scaling factor allows the detector circuit to provide more ADC levels per dB and thus provide accurate power control over a wider power range than through the use of a single gain path and a single scaling factor.
Claims14
A power detector in a wireless transmitting device, said power detector comprising two or more gain paths wherein each gain path is selected based upon a power range;
- wherein said power detector comprises a diode Radio Frequency (RF) detector and a diode reference detector, each operatively connected to two or more Opamps.
A method, comprising:
- selecting a gain path from a plurality of gain paths;
- using the selected gain path to compare a reference detector signal and a Radio Frequency (RF) detector signal;
- adjusting transmit power of a wireless transmitter based at least in part on the comparison;
- providing an output of an Opamp circuitry to an Analog to Digital Convertor (ADC);
- comparing an output of the ADC to a stored calibration value to identify a difference;
- generating an analog gain control level by inputting the identified difference into a Digital to Analog Convertor (DAC);
- and
- adjusting said transmit power according to the generated analog gain control level.
A system for detecting power in a wireless transmitting device, comprising:
- means for utilizing two or more Opamps, wherein each Opamp is selected by said utilization means based upon a power range;
- and
- means for transferring outputs from a diode reference detector and a diode RF detector to the Opamps.
Dependencies are inferred from the claim text.