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LTC5505 Datasheet

  • LTC5505

  • Linear Technology [40MHz to 900MHz Quadrature Demodulator]

  • LINER

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LT5517
APPLICATIO S I FOR ATIO
The LT5517 is a direct I/Q demodulator targeting high
linearity receiver applications. It consists of an RF ampli-
fier, I/Q mixers, a quadrature LO carrier generator and bias
circuitry.
The RF signal is applied to the inputs of the RF amplifier,
and is then demodulated into I-channel and Q-channel
baseband signals using precision quadrature LO signals,
which are internally generated using a divide-by-two cir-
cuit. The demodulated I/Q signals are lowpass filtered
internally with a 鈥?dB bandwidth of 130MHz. The differen-
tial outputs of the I-channel and Q-channel are well matched
in amplitude and their phases are 90擄 apart across the full
frequency range from 40MHz to 900MHz.
RF Input Port
Differential drive is recommended for the RF inputs as
shown in Figure 2. A low loss 1:4 transformer is used on
the demonstration board for a wide bandwidth input
impedance match and to assure good noise figure and
maximum demodulator gain. Single-ended to differential
conversion can also be implemented using narrowband
L-C circuits to produce the required balanced waveforms
at the RF
+
and RF
鈥?/div>
inputs using three discrete elements as
shown in Figure 5. Nominal values are listed in Table 1. (In
practice, these values should be compensated according
to the parasitics of the PCB.) The conversion gain and NF
RF
INPUT
C
S2
3.7pF
L
SH
15.6nH
Figure 5. RF Input Matching Network at 800MHz
8
U
of the receiver are similar to those of the transformer-
coupled demo board, because the single-ended to differ-
ential conversion has a 1:4 impedance transformation,
similar to the transformer.
Table 1. The Component Values of Matching Network L
SH
, C
S1
and C
S2
FREQUENCY (MHz)
40
100
200
300
400
500
600
700
800
900
L
SH
(nH)
437
169
80.8
51.5
37
28.3
22.6
18.5
15.6
13.5
C
S1
, C
S2
(pF)
71.1
28.6
14.3
9.6
7.2
5.8
4.9
4.2
3.7
3.3
W
U U
The differential impedance of the RF inputs is listed in
Table 2. The RF inputs may also be terminated in a single-
ended configuration. In this case either the RF
+
or the RF
鈥?/div>
input can be simply AC coupled to a 50鈩?source, while the
other RF input is connected to ground with a 1nF capacitor.
Note, however, that this will result in degraded conversion
gain and noise figure in most cases.
MATCHING NETWORK
C
S1
3.7pF
TO RF
+
TO RF
鈥?/div>
5517 F05
5517f

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