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450MHz CDMA/OFDM LNA/Mixer
Detailed Description
Low-Noise Amplifiers (LNAs)
The MAX2335’s LNA gain and linearity characteristics
can be adjusted using the MODE[2:0] inputs. See
Table 1 for the pin settings for various operating
modes. Use high-gain, high-linearity mode (HGHL)
when extra-high linearity is required for cross-modula-
tion suppression in the presence of strong interfering
signals (e.g., when the system transmitter is on). Use
high-gain, low-linearity mode (HGLL) when the trans-
mitter is off and cross-modulation is not a concern, and
use low-gain mode (LG) when receiving large signals.
R LNA can be adjusted to vary the current and linearity
of the HGHL LNA. R BIAS adjusts the current and the lin-
earity of the HGLL and LG LNA.
Downconverter
The mixer requires a DC-blocking capacitor at the input
and pullup inductors at the output. The DC-blocking
capacitors and pullup inductors can be designed to be
part of the matching circuits. See Table 1 for the MODE
settings for various operating modes.
LO Output Buffer
The LO output buffer is internally matched to 50 ? and
includes a DC-blocking capacitor. Enable the buffer by
driving the BUFFEN input high; disable the buffer by
driving the BUFFEN input low. The frequency of the
buffer output is equal to the LO frequency if the LO/2
input is driven low, or equal to the LO frequency divid-
ed by two if LO/2 is driven high.
Applications Information
Cascaded LNA/Mixer Performance
The LNA and mixer design optimizes cascaded perfor-
mance in all gain and linearity modes. In HGHL mode,
both the LNA and mixer have a low noise figure, high
gain, and high linearity. The LNA has high gain to mini-
mize the noise contribution of the mixer, thus increasing
the receiver’s sensitivity, and the LNA has high linearity
for cross-modulation suppression. The HGLL mode is
used when the transmitter is off and cross-modulation
is not a concern. In LG mode, the received signal is
strong enough that linearity is the primary concern. The
LNA gain is reduced to achieve higher system linearity.
S-Parameters
The S-parameters in Tables 2, 3, and 4 can be used to
design the RF matching circuits.
Table 1. Operating Modes
MODES
FUNCTION
CONTROL
PINS
HGHL (LO Frequency Divided by Two)
HGLL (LO Frequency Divided by Two)
LG (LO Frequency Divided by Two)
HGHL (LO Frequency Undivided)
HGLL (LO Frequency Undivided)
LG (LO Frequency Undivided)
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
1
1
0
1
1
0
1
0
1
1
0
1
1
1
1
1
1
1
1
1
1
0
0
0
Shutdown Mode
Undefined
Undefined
0
1
X
0
X
1
0
0
0
X
X
X
6
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