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MAX2022ETX-TD

High-Dynamic-Range, Direct Upconversion 1500MHz to 2500MHz Quadrature Modulator

Maxim Integrated 

High-Dynamic-Range, Direct Upconversion

1500MHz to 2500MHz Quadrature Modulator

Pin Description

PIN

1, 5, 9–12, 14,

16–19, 22, 24,

27–30, 32, 34,

35, 36

2

3

4

6

7

8

13

15

20

21

23

25

26

31

33

EP

NAME

FUNCTION

GND

Ground

RBIASLO3

VCCLOA

LO

RBIASLO1

COMP

RBIASLO2

VCCLOI1

VCCLOI2

BBIP

BBIN

RFOUT

BBQN

BBQP

VCCLOQ2

VCCLOQ1

GND

3rd LO Amplifier Bias. Connect a 301Ω resistor to ground.

LO Input Buffer Amplifier Supply Voltage

Local Oscillator Input. 50Ω input impedance.

1st LO Input Buffer Amplifier Bias. Connect a 432Ω resistor to ground.

Compensation Capacitor Input. Connect a 22pF capacitor to ground.

2nd LO Amplifier Bias. Connect a 562Ω resistor to ground.

I-Channel 1st LO Amplifier Supply Voltage

I-Channel 2nd LO Amplifier Supply Voltage

Baseband In-Phase Positive Input

Baseband In-Phase Negative Input

RF Output

Baseband Quadrature Negative Input

Baseband Quadrature Positive Input

Q-Channel 1st LO Amplifier Supply Voltage

Q-Channel 2nd LO Amplifier Supply Voltage

Exposed Ground Paddle. The exposed paddle MUST be soldered to the ground plane using

multiple vias.

Detailed Description

The MAX2022 is designed for upconverting differential

in-phase (I) and quadrature (Q) inputs from baseband to

a 1500MHz to 2500MHz RF frequency range.

Applications include single and multicarrier 1800MHz to

2200MHz UMTS/WCDMA, cdma2000, and DCS/PCS

base stations. Direct upconversion architectures are

advantageous since they significantly reduce transmitter

cost, part count, and power consumption as compared

to traditional IF-based double upconversion systems.

The MAX2022 integrates internal baluns, an LO buffer, a

phase splitter, two LO driver amplifiers, two matched

double-balanced passive mixers, and a wideband

quadrature combiner. Precision matching between the

in-phase and quadrature channels, and highly linear

mixers achieves excellent dynamic range, ACLR, 1dB

compression point, and LO and sideband suppression,

making it ideal for four-carrier WCDMA/UMTS operation.

LO Input Balun, LO Buffer, and

Phase Splitter

The MAX2022 requires a single-ended LO input, with a

nominal power of 0dBm. An internal low-loss balun at

the LO input converts the single-ended LO signal to a

differential signal at the LO buffer input. In addition, the

internal balun matches the buffer’s input impedance to

50Ω over the entire band of operation.

The output of the LO buffer goes through a phase split-

ter, which generates a second LO signal that is shifted

by 90° with respect to the original. The 0° and 90° LO

signals drive the I and Q mixers, respectively.

LO Driver

Following the phase splitter, the 0° and 90° LO signals

are each amplified by a two-stage amplifier to drive the

I and Q mixers. The amplifier boosts the level of the LO

signals to compensate for any changes in LO drive lev-

els. The two-stage LO amplifier allows a wide input

power range for the LO drive. While a nominal LO

power of 0dBm is specified, the MAX2022 can tolerate

LO level swings from -3dBm to +3dBm.

I/Q Modulator

The MAX2022 modulator is composed of a pair of

matched double-balanced passive mixers and a balun.

The I and Q differential baseband inputs accept signals

from DC to beyond 100MHz with differential amplitudes

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