Receiver with sigma-delta structure
First Claim
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.
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Accused Products
Abstract
There is provided a receiver with a sigma-delta structure, the receiver including: a low noise amplifier amplifying a received signal according to a detection signal; a mixer converting an RF signal of the low noise amplifier into an IF signal; a sigma-delta A/D converter converting the IF signal from the mixer 200 into a digital signal; a 1 bit detector determining whether a voltage of the output signal of the mixer is greater than that of a predetermined reference voltage and outputting the detection signal including a result of the determination; and a demodulator obtaining an FFT result with respect to the signal from the sigma-delta A/D converter and adding or subtracting a predetermined gain value to or from the FFT result to calculate received signal strength indication (RSSI).
16 Citations
7 Claims
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1. A receiver with a sigma-delta structure, the receiver comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A receiver with a sigma-delta structure, the receiver comprising:
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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, wherein if a level of the detection signal is a weak signal level, the demodulator calculates a received signal strength indication (RSSI) by adding a predetermined constant to the FFT result, and if the level is a strong signal level, the demodulator calculates the RSSI by adding the predetermined constant to and subtracting a predetermined gain value from the FFT result.
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Specification