Patent ID: 7769114
Filing Date: 2010-08-03
Classification: H04L

Abstract:
1. A multi-mode receiver circuit comprising: a shared receiver for receiving an input signal formed according to one of a plurality of modulation and communication systems to output a received signal; a detector for detecting a signal intensity of the received signal to output a detected signal representative of the signal intensity; a determiner having at least a first threshold value and a second threshold value set for comparing the detected signal with the first and second threshold values to output a control signal corresponding to a result of comparison, the second threshold value being higher than the first threshold value; a first switch operative in response to the control signal for selectively conducting the received signal to output the received signal or intercepting the received signal; a second switch operative in response to the control signal for selectively conducting the received signal to output the received signal or intercepting the received signal; a first demodulator interconnected to said first switch for demodulating the received signal, when output from said first switch, to output a demodulated signal; and a second demodulator interconnected to said second switch for demodulating the received signal, when output from said second switch, to output a demodulated signal; the first and second threshold values being set to values corresponding to the signal intensities employed when said first and second demodulators output the demodulated signals having an intended communication quality, respectively; said determiner outputting the control signal causing said first switch to conduct and said second switch to intercept the received signal when the signal intensity represented by the detected signal falls between the first threshold value and the second threshold value; said determiner outputting the control signal causing said first switch and said second switch to conduct the received signal when the signal intensity represented by the detected signal exceeds the second threshold value; whereby said first and second demodulators output the demodulated signal having the intended communication quality maintained.