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Antenna diversity receiver

  • US 8,374,565 B2
  • Filed: 08/08/2008
  • Issued: 02/12/2013
  • Est. Priority Date: 12/29/2007
  • Status: Active Grant
First Claim
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1. An antenna diversity receiver, comprising:

  • a plurality of antennas;

    an antenna selector unit for selecting one of the antennas;

    a radio-frequency (RF) module unit for converting an RF receive (RX) signal received from the antenna selector unit into a baseband RX signal;

    a logic gate unit for controlling a power detection mode for detecting a power level of an RX signal received through each of the antennas and an operation mode for selecting one of the antennas based on the detected power level;

    a power detector unit for detecting the power level of the RX signal received through each of the antennas based on the RX signal received through the RF module unit, under a control of the logic gate unit; and

    a selection controller unit for controlling the antenna selector unit to sequentially select the antennas in the power detection mode and controlling the antenna selector unit to select an antenna with a highest RX sensitivity among the antennas in the operation mode based on the power level detected by the power detector unit, under the control of the logic gate unit, whereinthe RF module unit comprises;

    a low-noise amplifier for low-noise-amplifying the RF RX signal received from the antenna selector unit;

    a mixer for converting the RF RX signal received from the low-noise amplifier into a baseband RX signal;

    a band-pass filter for passing an RX signal of a predetermined band among the RX signals received from the mixer; and

    a variable-gain amplifier for amplifying the RX signal received from the band-pass filter,the power detector unit is configured to detect the power level of the RX signal received through each of the antennas based on the RX signal output from the band-pass filter of the RF module unit,the antennas comprise a first antenna and a second antenna,the antenna selector unit comprises;

    a first antenna switch configured to select the first antenna under a control of the selection controller unit; and

    a second antenna switch configured to select the second antenna under the control of the selection controller unit,the logic gate unit is configured to;

    generate, in the power detection mode, first and second clock signals used to detect the power level of the RX signal received through the first antenna and third and fourth clock signals used to detect the power level of the RX signal received through the second antenna, to output the first and second clock signals and the third and fourth clock signals to the power detector unit;

    generate, in the power detection mode, a fifth clock signal used to select the first antenna or the second antenna, to output the fifth clock signal to the selection controller unit; and

    generate a mode selection signal used to select the fifth clock signal in the power detection mode and to select the output signal of the power detector unit in the operation mode, to output the mode selection signal to the selection controller unit, andthe power detector unit comprises;

    a rectifier unit for rectifying the RX signal received from the band-pass filter;

    a first capacitor connected between a ground terminal and an output terminal of the rectifier unit to be charged with a voltage corresponding to the RX signal received through the first antenna;

    a second capacitor connected between the ground terminal and the output terminal of the rectifier unit in parallel to the first capacitor to be charged with a voltage corresponding to the RX signal received through the second antenna;

    a comparator for comparing a first detection voltage charged in the first capacitor with a second detection voltage charged in the second capacitor, to output a comparison result signal with regard to the first detection voltage and the second detection voltage;

    a first charge switch connected between the first capacitor and the output terminal of the rectifier unit to switch a charge path of the first capacitor in response to the first clock signal of the logic gate unit;

    a second charge switch connected between the second capacitor and an output terminal of the band-pass filter to switch a charge path of the second capacitor in response to the third clock signal of the logic gate unit;

    a first discharge switch connected in parallel to the first capacitor to switch a discharge path of the first capacitor in response to the second clock signal of the logic gate unit; and

    a second discharge switch connected in parallel to the second capacitor to switch a discharge path of the second capacitor in response to the fourth clock signal of the logic gate unit.

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