MAX9995EVKIT【PDF 3/8 页】EVAL KIT FOR MAX9995

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MAX9995 Evaluation Kit

Table 1. Test Equipment

Current-Limiting Resistors

Resistors R3 and R6 are used for current limiting at the

EQUIPMENT

HP E3631A

Fluke 75 Series II

HP/Agilent 8648B

HP 437B

HP 8561

HP 8482A

3dB pad

50 ? termination

QTY

1

1

3

1

1

1

4

1

DESCRIPTION

DC power supply

Digital multimeter (ammeter)

RF signal generators

RF power meter

Spectrum analyzer

High-power sensor (power

head)

3dB attenuators

50 ? (1W) termination

supply. These resistors typically dissipate 50mW each.

TAP Network

The network at TAP formed by C2, C3, C6, and C7

helps to terminate the second-order intermodulation

products at the RF inputs.

IND_EXT

The 10nH wire-wound inductors L3 and L6 improve LO-

to-IF and RF-to-IF isolation. If isolation is not critical,

then the corresponding pins can be grounded.

IF Outputs

get an accurate output power measurement.

Disconnect the GND connection to LOSEL. It will be

pulled high by a pullup resistor on the board. This

selects LO1. Observe the new IF output at 200MHz.

Reconfigure the test setup using a combiner or hybrid

to sum the two RF inputs to do a two-tone IP3 measure-

ment, if desired. Terminate the unused LO input in 50 ? .

Detailed Description

The MAX9995 is a highly integrated dual downconvert-

er; RF and LO baluns are integrated on-chip, as well as

two double-balanced mixers, two IF amplifiers, an LO

buffer, and a single-pole/double throw (SPDT) LO input

select switch. The EV kit circuit consists mostly of sup-

ply decoupling capacitors and DC-blocking capacitors,

making for a simple design-in.

DC-Blocking Capacitors

The MAX9995 has internal baluns on the RFMAIN,

RFDIV, LO1, and LO2 inputs. These inputs have almost

0 ? resistance at DC, so DC-blocking capacitors C1,

C8, C14, and C16 are used to prevent any external

bias from being shunted directly to ground. Capacitors

C10, C11, C19, and C20 are used to keep DC current

from flowing into the transformer, as well as providing

the flexibility for matching.

LO Buffer and IF Amplifier Bias

Bias currents for the integrated LO buffers and the IF

output amplifiers are set with resistors R2, R5, and R1,

R4, respectively. These values were carefully chosen

for best linearity and lowest supply current through test-

ing at the factory. Changing these values, or using

lower tolerance resistors, degrades performance. If

lower currents are desired, consult the factory for opti-

mum resistor settings.

The MAX9995 employs a differential IF output to offer

increased IP2 system performance. For convenience,

the EV kit uses a 4:1 balun to transform the 200 ? differ-

ential output impedance to a 50 ? single-ended output.

Inductive pullups provide DC bias to the IF output

amplifiers. Series capacitors C10, C11, C19, and C20

work in conjunction with the inductors and the 4:1 balun

transformers (T1 and T2) to match the IF outputs for

200MHz operation.

As the differential IF outputs are relatively high imped-

ance (200 ? ), they are more susceptible to component

parasitics. It is often good practice to relieve the

ground plane directly underneath large components to

reduce associated shunt-C parasitics (see Figure 6).

LOSEL

The EV kit includes a 47k ? pullup resistor for easy

selection of the LO port. Providing a ground at TP3

selects LO2, and leaving TP3 open selects LO1. To

drive TP3 from an external source, follow the limits

called out in the MAX9995 device data sheet. Do not

apply logic voltages to TP3 without the +5V supply

applied. Doing so can cause the on-chip ESD diodes to

conduct and could damage the part.

_______________________________________________________________________________________

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