MAX19994AEVKIT#【PDF 24/28 页】KIT EVAL FOR MAX19994A MIXER

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Dual, SiGe, High-Linearity, 1200MHz to 2000MHz

Downconversion Mixer with LO Buffer/Switch

details). Operation beyond these ranges is possible;

see the Typical Operating Characteristics for additional

information.

Although this device is optimized for a 1450MHz to

2050MHz LO frequency range, it can operate with

even lower LO frequencies to support 1200MHz to

1700MHz low-side LO injection architectures. However,

performance degrades as f LO continues to decrease.

Contact the factory for a variant with increased low-side

LO performance.

RF Port and Balun

The RF input ports for both the main and diversity chan-

nels are internally matched to 50 I , requiring no exter-

nal matching components when operating the device

over a 1200MHz to 1700MHz RF frequency range.

A DC-blocking capacitor is required as the input is

internally DC shorted to ground through the on-chip

balun. The RF port input return loss is typically better

than 15dB over the 1200MHz to 1700MHz RF frequency

range.

The RF inputs of the device can also be matched to

operate over an extended 1700MHz to 2000MHz RF

frequency range of with the addition of two shunt 4.7nH

inductors. See Table 1 for details.

LO Inputs, Buffer, and Balun

The device is optimized for a 1450MHz to 2050MHz

LO frequency range. As an added feature, the device

includes an internal LO SPDT switch for use in frequency-

hopping applications. The switch selects one of the two

single-ended LO ports, allowing the external oscillator to

settle on a particular frequency before it is switched in.

LO switching time is typically 50ns, which is more than

adequate for typical GSM applications. If frequency hop-

ping is not employed, simply set the switch to either of

the LO inputs. The switch is controlled by a digital input

(LOSEL), where logic-high selects LO1 and logic-low

selects LO2. LO1 and LO2 inputs are internally matched

to 50 I , requiring only 39pF DC-blocking capacitors.

If LOSEL is connected directly to a logic source, then

voltage MUST be applied to V CC before digital logic

is applied to LOSEL to avoid damaging the part.

Alternatively, a 1k I resistor can be placed in series at

the LOSEL to limit the input current in applications where

LOSEL is applied before V CC .

The main and diversity channels incorporate a two-stage

LO buffer that allows for a wide-input power range for

the LO drive. The on-chip low-loss baluns, along with LO

buffers, drive the double-balanced mixers. All interfacing

24

and matching components from the LO inputs to the IF

outputs are integrated on-chip.

High-Linearity Mixer

The core of the MAX19994A dual-channel downconvert-

er consists of two double-balanced, high-performance

passive mixers. Exceptional linearity is provided by the

large LO swing from the on-chip LO buffers. When com-

bined with the integrated IF amplifiers, the cascaded

IIP3, 2LO - 2RF rejection, and noise-figure performance

are typically +25dBm, 68dBc, and 9.8dB, respectively.

Differential IF

The device has a 50MHz to 500MHz IF frequency range,

where the low-end frequency depends on the frequency

response of the external IF components. Note that these

differential ports are ideal for providing enhanced IIP2

performance. Single-ended IF applications require a

4:1 (impedance ratio) balun to transform the 200 I dif-

ferential IF impedance to a 50 I single-ended system.

After the balun, the return loss is typically 13dB. The user

can use a differential IF amplifier on the mixer IF ports,

but a DC block is required on both IFD+/IFD- and IFM+/

IFM- ports to keep external DC from entering the IF ports

of the mixer.

Applications Information

Input and Output Matching

The RF and LO inputs are internally matched to

50 I when operating over 1200MHz to 1700MHz and

1450MHz to 2050MHz frequency ranges, respectively.

No matching components are required for operation

within these bands. The RF port input return loss is

typically better than 15dB over the 1200MHz to 1700MHz

RF frequency range and return loss at the LO ports is

typically better than 15dB over the entire LO range. RF

and LO inputs require only DC-blocking capacitors for

interfacing.

If operating the device over the Extended RF Band of

1700MHz to 2000MHz, simply change the DC-blocking

capacitors to 1.8pF and add a shunt 4.7nH inductor to

each RF port. See Table 1 for details. When matched with

this alternative set of elements, the RF port input return

loss is typically better than 14dB over the 1700MHz to

2000MHz band.

The IF output impedance is 200 I (differential). For evalu-

ation, an external low-loss 4:1 (impedance ratio) balun

transforms this impedance to a 50 I single-ended output

(see the Typical Application Circuit ).

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