UAA2077TS データシートの表示（PDF） - Philips Electronics
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UAA2077TS Datasheet PDF : 16 Pages
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Philips Semiconductors
2 GHz image rejecting front-end
Preliminary specification
UAA2077TS
FUNCTIONAL DESCRIPTION
Receive section
The circuit contains a low-noise amplifier followed by two
high dynamic range mixers (see Fig.3). The mixers are of
the Gilbert cell type, the architecture of which is fully
differential.
The LO signal is phase shifted into 45° and 135° signals,
mixed with the RF input signal to provide the
I and Q channel signals. The I and Q channel signals are
buffered, phase shifted by 45° and 135° respectively,
amplified and internally combined, thus obtaining image
rejection.
Balanced signal interfaces are used for minimizing
crosstalk from package parasitics.
The IF output is of a differential open collector type.
A typical application consists of pull-up resistors of 680 Ω
at each IF output and a differential load resistance of 1 kΩ
for the IF filter, due to its impedance or its matching
network.
The power gain refers to the resulting power into the 1 kΩ
load. The path for the DC current from VCC into the open
collector outputs should be realized by the inductors.
The output signal is limited to VCC + 3VBE.
Fast switching between power-down and the RX mode is
controlled by the mode control pin RXON.
handbook, full pagewidth
VCCLNA LNAGND GND n.c.
RXON
1
6
9
2, 5, 8
10
45°
×
3
RFINA
4
LNA
RFINB
135°
×
UAA2077TS
IF
COMBINER
15
IFA
16
IFB
to LO section
FCA013
Fig.3 Receive section.
2000 Apr 17
4
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