bluetooth receiver

There are three receiver architectures that are amenable
to full integration: direct conversion, single low-IF downconversion
and poly-phase filtering, and wideband-IF
double down-conversion(Weaver architecture). The Bluetooth
signal is approximately 1MHz wide with most of its
energy concentrated in the middle of the band. Thus, direct
conversion receiver would be difficult to implement,
especially in CMOS because of 1/f noise. The Bluetooth
standard has a relaxed image requirement; therefore, a
low-IF architecture seems to be the best choice . The
selection of the IF is a trade-off between the 1/f noise
and the filter quality factor. We have selected an IF of
2MHz. It gives good ”immunity” to 1/f noise and dc offsets,
while the required