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MAX2021
High-Dynamic-Range, Direct Up-/Downconversion
650MHz to 1200MHz Quadrature Mod/Demod
AC ELECTRICAL CHARACTERISTICS (Demodulator LO = 965MHz) (continued)
(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 A = +25°C,
V CC = 5.0V, I/Q DC voltage return = 0V, P RF = 0dBm, P LO = 0dBm, f RF = 780MHz, f LO = 965MHz, f IF = 185MHz, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
f RF1 = 780MHz, f RF2 = 781MHz,
P RF1 = P RF2 = 0dBm, f IF1 = 185MHz,
70.1
Input Second-Order Intercept
Point
IIP2
f IF2 = 184MHz, f IF1 + f IF2 term
f RF1 = 780MHz, f RF2 = 735MHz,
P RF1 = P RF2 = 0dBm, f IF1 = 185MHz,
70.2
dBm
f IF2 = 230MHz, f IF1 + f IF2 term
2LO - 2RF, f RF = 872.5MHz, P RF = -10dBm
84
Spurious Relative to a
Fundamental at 780MHz
Input Compression from Linear
I/Q Gain Mismatch
I/Q Phase Mismatch
1dB Conversion Loss Flatness
RF Return Loss
LO Return Loss
3LO - 3RF, f RF = 903.333MHz, P RF = -10dBm
3RF - 2LO, f RF = 705MHz, P RF = -10dBm
4RF - 3LO, f RF = 770MHz, P RF = -10dBm
5RF - 4LO, f RF = 809MHz, P RF = -10dBm
P RF = 0dBm to 21dBm
f LO = 965MHz, f LO > f RF
99
105
114
115
0.17
0.05
0.4
400
17
12
dBc
dB
dB
Degrees
MHz
dB
dB
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Recommended functional range. Not production tested. Operation outside this range is possible, but with degraded
performance of some parameters.
Guaranteed by design and characterization.
Parameter also applies to demodulator topology.
Single-carrier WCDMA with 10.5dB peak-to-average ratio at 0.1% complementary cumulative distribution function,
P RF = -10dBm (P RF is chosen to give -65dBc ACLR).
No baseband drive input. Measured with the inputs terminated in 50 Ω . At low output levels, the output noise is thermal.
Note 10: The output noise versus P OUT curve has the slope of LO noise (Ln dBc/Hz) due to reciprocal mixing.
Note 11: Conversion loss is measured from the single-ended RF input to single-ended combined baseband output.
Note 12: 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 (Tp in Kelvin), F BLOCK = 1 + (Lcn - 1) Tp / To + LP BLOCK / (1000kTo), where
To = 290K, P BLOCK in mW, k is Boltzmann’s constant = 1.381 x 10 (-23) J/K, and Lcn = 10 (Lc/10) , Lc is the conversion loss.
Noise figure under-blocking in dB is NF BLOCK = 10 x log (F BLOCK ). Refer to Application Note 3632: Wideband LO Noise in
Passive Transmit-Receive Mixer ICs.
Maxim Integrated
5
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