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High-Dynamic-Range, Direct Up-/Downconversion
1500MHz to 2500MHz Quadrature Mod/Demod
AC ELECTRICAL CHARACTERISTICS (Demodulator, LO = 2350MHz) (continued)
(MAX2023 Typical Application Circuit when operated as a demodulator. I/Q outputs are recombined using network shown in
Figure 5. Losses of combining network not included in measurements. RF and LO ports are driven from 50 Ω sources. Typical values
are for T C = +25°C, V CC = 5V, I/Q DC returns = 160 Ω resistors to GND, P RF = 0dBm, P LO = 0dBm, f RF = 2140MHz, f LO = 2350MHz,
f IF = 210MHz, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RF Port Impedance (R+jX)
(At RF Pin)
RF = 2140MHz,
C9 = short
Real
Imag
74.7
+j46.3
LO Port Return Loss
C3 = 3pF
23
dB
LO Port Impedance (R+jX)
(At LO Pin)
IF Port Differential Return Loss
IF Port Differential Impedance
(At IF Pins) (R+jX)
Minimum Demodulation 3dB
Bandwidth
Minimum 1dB Gain Flatness
LO = 2350MHz,
C3 = short
IF = 210MHz,
LO = 2350MHz
Real
Imag
Real
Imag
38.0
+j20.7
27
53.2
-j2.8
> 1000
> 800
dB
MHz
MHz
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Guaranteed by production test.
Recommended functional range. Not production tested. Operation outside this range is possible, but with degraded
performance of some parameters.
V I/Q = 2.66V P-P differential CW input.
No baseband drive input. Measured with the baseband inputs terminated in 50 Ω . At low output power levels, the output
noise density is equal to the thermal noise floor. See Output Noise Density vs. Output Power plots in Typical Operating
Characteristics.
The output noise vs. P OUT curve has the slope of LO noise (Ln dBc/Hz) due to reciprocal mixing. Measured at 10MHz off-
set from carrier.
Note 10: The LO noise (L = 10 (Ln/10) ), determined from the modulator measurements can be used to deduce the noise figure
under-blocking at operating temperature (T P in Kelvin), f BLOCK = 1 + (L CN - 1) T P / T O + LP BLOCK / (1000kT O ), where
T O = 290K, P BLOCK in mW, k is Boltzmann’s constant = 1.381 x 10 (-23) J/K, and L CN = 10 (L C /10) , L C is the conversion loss.
Noise figure underblocking in dB is NF BLOCK = 10 x log (f BLOCK ). Refer to Application Note 3632.
5
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