Patent ID: 8095100
Filing Date: 2012-01-10
Classification: H04B

Abstract:
1. A receiver with a sigma-delta structure, the receiver comprising: a low noise amplifier for amplifying a received signal according to a detection signal; a mixer for converting a radio frequency (RF) signal from the low noise amplifier into an intermediate frequency (IF) signal; a sigma-delta A/D converter for converting the IF signal from the mixer into a digital signal; a 1 bit detector for determining whether a voltage of the IF signal from the mixer is greater than a predetermined reference voltage, and outputting the detection signal based on the determination; and a demodulator for obtaining an FFT result with respect to the digital signal from the sigma-delta A/D converter, and adding or subtracting a predetermined gain value to or from the FFT result to calculate a received signal strength indication (RSSI) based on a level of the detection signal.