Patent ID: 7623837

Claim:
A heterodyne receiving circuit for a digital communication system, comprising: a band pass first filter receiving a signal generated by an antenna, said first filter including a first BAW-type tunable resonator component which is adjustable by a first electrical signal, said first electrical signal being generated by a first PLL-type frequency control loop; an amplifier located downstream with respect to said first band pass filter; a narrow band pass second filter which is located downstream with respect to said amplifier and said first filter, said second filter receiving a band of frequencies which is filtered by said first filter; said second filter including a second BAW-type tunable resonator component which is adjustable by a second electrical signal different than the first electrical signal, said second electrical signal being generated by a second PLL-type frequency control loop which has a variable division factor for selecting one particular channel within said band of frequencies; a mixer for mixing a signal outputted by said second filter with a local oscillation frequency in order to generate an intermediate frequency; and a digital processing system for processing said intermediate frequency.