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MAX19998

SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer

Maxim Integrated 

SiGe, High-Linearity, 2300MHz to 4000MHz

Downconversion Mixer with LO Buffer

5.0V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 2300MHz to 2900MHz,

HIGH-SIDE LO INJECTION (continued)

(Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports

are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 2300MHz to 2900MHz, fIF = 300MHz, fLO = 2600MHz

to 3200MHz, fRF < fLO, TC = -40NC to +85NC. Typical values are for TC = +25NC, VCC = 5.0V, PRF = -5dBm, PLO = 0dBm, fRF =

2600MHz, fLO = 2900MHz, fIF = 300MHz, unless otherwise noted. (Note 7)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

IIP3 Variation with TC

Single-Sideband Noise Figure

Noise Figure Temperature

Coefficient

2LO - 2RF Spur Rejection

3LO - 3RF Spur Rejection

RF Input Return Loss

NFSSB

TCNF

2x2

3x3

RLRF

fRF = 2300MHz to 2900MHz, fRF1 - fRF2 = 1MHz,

PRF1 = PRF2 = -5dBm/tone, TC = -40NC to +85NC

No blockers present

Single sideband, no blockers present,

TC = -40NC to +85NC

fSPUR = fLO - 50MHz

PRF = -10dBm

PRF = -5dBm

fSPUR

=

fLO

-

100MHz

PRF

PRF

=

=

-10dBm

-5dBm

LO on and IF terminated into a matched

impedance

Q0.2

10.0

0.018

77

72

86

76

30

dBm

dB

dB/NC

dBc

dBc

dB

LO Input Return Loss

RLLO

RF and IF terminated into a matched

impedance

18

dB

IF Output Impedance

ZIF

Nominal differential impedance at the IC’s IF

outputs

200

I

IF Output Return Loss

RF terminated into 50I,

LO driven by 50I source,

fIF = 450MHz,

L1 = L2 = 120nH

25

IF transformed to 50I

using external compo-

fIF = 350MHz,

L1 = L2 = 270nH

25

RLIF nents shown in the Typical

dB

Application Circuit. See

the Typical Operating

fIF = 300MHz,

Characteristics for perfor- L1 = L2 = 390nH

25

mance vs. inductor values.

RF-to-IF Isolation

PLO = +3dBm

45

dB

LO Leakage at RF Port

PLO = +3dBm

-28.8

dBm

2LO Leakage at RF Port

PLO = +3dBm

-42.3

dBm

LO Leakage at IF Port

PLO = +3dBm

-26.3

dBm

Note 5: Not production tested.

Note 6: Operation outside this range is possible, but with degraded performance of some parameters. See the Typical

Operating Characteristics.

Note 7: All limits reflect losses of external components, including a 0.8dB loss at fIF = 300MHz due to the 4:1 impedance trans-

former. Output measurements were taken at IF outputs of the Typical Application Circuit.

Note 8: Guaranteed by design and characterization.

Note 9: 100% production tested for functional performance.

Note 10: Maximum reliable continuous input power applied to the RF port of this device is +12dBm from a 50I source.

Note 11: Measured with external LO source noise filtered so that the noise floor is -174dBm/Hz. This specification reflects the

effects of all SNR degradations in the mixer including the LO noise, as defined in Application Note 2021: Specifications

and Measurement of Local Oscillator Noise in Integrated Circuit Base Station Mixers.

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