Patent ID: 7139545
Filing Date: 2006-11-21
Classification: H04B

Abstract:
1. A receiver system for identifying unknown signals comprising: an intelligent-preselector stage comprising a plurality of half-octave filters and a plurality of up-converting elements, each half-octave filter covering at least approximately a half-octave portion of a 2 to 20 GHz receive-frequency range, the up-converting elements selectable to upconvert signals within different portions of the receive-frequency range; a signal identifier to identify a signal within the receive-frequency range based on coupled outputs of the half-octave filters; a controller to provide a select command to an RF switch to selectively provide stepped first oscillation signals to one of the up-converting elements based on a frequency of the identified signal to up-convert the identified signal to within a first IF frequency-range; a first down-converting stage to down-convert the upconverted signal to a signal within a second IF frequency-range with a fixed second oscillation signal; a second down-converting stage to down-convert the downconverted signal from within the second IF frequency-range to a signal within a third IF frequency-range with stepped third oscillation signals; and a synthesizer to generate the first, second and third oscillation signals by dividing on a master reference signal with half-integer frequency dividers.