MAX2022ETX+T【PDF 20/26 页】IC MOD 1500MHZ TO 2500MHZ 36TQFN

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MAX2022

RF Output

The MAX2022 utilizes an internal passive mixer architec-

ture. This enables a very low noise floor of -173.2dBm/Hz

for low-level signals, below about -20dBm output power

level. For higher output level signals, the noise floor will

be determined by the internal LO noise level at approxi-

mately -162dBc/Hz.

The I/Q input power levels and the insertion loss of the

device will determine the RF output power level. The input

power is the function of the delivered input I and Q voltag-

es to the internal 50? termination. For simple sinusoidal

baseband signals, a level of 89mV P-P differential on the I

and the Q inputs results in an input power level of -17dBm

delivered to the I and Q internal 50? terminations. This

results in a -23.5dBm RF output power.

Generation of WCDMA Carriers

The MAX2022 quadrature modulator makes an ideal sig-

nal source for the generation of multiple WCDMA carriers.

The combination of high OIP3 and exceptionally low out-

put noise floor gives an unprecedented output dynamic

range. The output dynamic range allows the generation of

four WCDMA carriers in the UMTS band with a noise floor

sufficiently low to meet the 3GPP specification require -

ments with no additional RF filtering. This promotes an

extremely simple and efficient transmitter lineup. Figure 2

MAX5895

High-Dynamic-Range, Direct Up/

Downconversion 1500MHz to 3000MHz

Quadrature Modulator/Demodulator

illustrates a complete transmitter lineup for a multicarrier

WCDMA transmitter in the UMTS band.

The MAX5895 dual interpolating-modulating DAC is

operated as a baseband signal generator. For genera-

tion of four carriers of WCDMA modulation, and digital

predistortion, an input data rate of 61.44 or 122.88Mbps

can be used. The DAC can then be programmed to

operate in x8 or x4 interpolation mode, resulting in a

491.52Msps output sample rate. The DAC will gener -

ate four carriers of WCDMA modulation with an ACLR

typically greater than 77dB under these conditions. The

output power will be approximately -18dBm per carrier,

with a noise floor typically less than -144dBc/Hz.

The MAX5895 DAC has built-in gain and offset fine

adjustments. These are programmable by a 3-wire serial

logic interface. The gain adjustment can be used to adjust

the relative gains of the I and Q DAC outputs. This feature

can be used to improve the native sideband suppression

of the MAX2022 quadrature modulator. The gain adjust-

ment resolution of 0.01dB allows sideband nulling down

to approximately -60dB. The offset adjustment can simi-

larly be used to adjust the offset DC output of each I and

Q DAC. These offsets can then be used to improve the

native LO leakage of the MAX2022. The DAC resolution

of 4 LSBs will yield nulled LO leakage of typically less

than -50dBc relative to four-carrier output levels.

L-C FILTER

MAX2022

RF-MODULATOR

MAX2057

I/Q GAIN AND

OFFSET ADJUST

∑

+12dB

OUTPUT

SYNTH

CLOCK

Figure 2. Complete Transmitter Lineup for a Multicarrier WCDMA in the UMTS Band

www.maximintegrated.com

Maxim Integrated │ 20

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