Subsampling wideband RSSI circuit

Details Subsampling wideband RSSI circuit Subsampling wideband RSSI circuit

2011-08-23

2011-08-23

Phu, Sanh (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

C455S226400, C455S183200, C455S186100, C455S245100, C348S726000

Reexamination Certificate

active

08005449

ABSTRACT:
A Received Signal Strength Indicator (RSSI) circuit includes a subsampling circuit that processes an input signal comprising a sampling frequency, fs, wherein the subsampling circuit subsamples the input signal, wherein the input signal is subsampled to concentrate a power in a narrow bandwidth; an analog-to-digital converter (ADC) operatively connected to the subsampling circuit, wherein the ADC digitizes the subsampled signal; and a baseband detector operatively connected to the ADC, wherein the baseband detector detects a power from the digitized subsampled signal and creates an output signal. The subsampling circuit and the ADC may operate as a single subsampling ADC. The RSSI circuit may further comprise ignoring higher order aliases at a multiple of the sampling frequency if the baseband detector is clocked at the sampling frequency.

REFERENCES:
patent: 6175279 (2001-01-01), Ciccarelli et al.
patent: 2005/0281151 (2005-12-01), Kanda
patent: 2008/0225182 (2008-09-01), Silver et al.
Zhang, et al., “Bipolar Microwave RMS Power Detectors,” IEEE Journal of Solid-State Circuits, vol. 41, No. 9, Sep. 2006, pp. 2188-2192.
Jeon, et al., “Analog AGC Circuitry for a CMOS WLAN Receiver,” IEEE Journal of Solid-State Circuits, vol. 41, No. 10, Oct. 2006, pp. 2291-2300.

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