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AD8348
VCMO. This forms a high-pass response for the baseband
signal path with a lower 3 dB frequency of
The IOFS (QOFS) pin must be connected to either a bypass
capacitor (>0.1 μF) or an external voltage source to prevent the
f PASS =
1
2 π × 2650 Ω × COFS
feedback loop from oscillating.
The feedback loop will be broken at dc if an ac-coupled baseband
Alternatively, the user can externally adjust the dc offset by driving
IOFS (QOFS) with a digital-to-analog converter or other voltage
source. In this case, the baseband circuit operates all the way down
filter is placed between the mixer outputs and the baseband
amplifier inputs. If an ac-coupled filter is implemented, the user
must handle the offset compensation via some external means.
to dc ( f PASS = 0 Hz). The integrator output current is only 50 μA
and can be easily overridden with an external voltage source.
The nominal voltage level applied to IOFS (QOFS) to produce
a 0 V differential offset at the baseband outputs is 900 mV.
Rev. A | Page 19 of 28
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