MAX9986AEVKIT【PDF 4/8 页】EVAL KIT FOR MAX9986

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MAX9986A Evaluation Kit

Layout Considerations

The MAX9986A evaluation board can be a guide for your

board layout. Pay close attention to thermal design and

close placement of components to the IC. The

ground. The total 2pF of capacitance is resonated out

at the frequency of interest by bias inductors L1 and

L2. To determine the inductor value use the following

equation:

MAX9986A package exposed paddle (EP) conducts

heat from the device and provides a low-impedance

electrical connection to the ground plane. The EP MUST

f IF =

1

2 π LC

be attached to the PCB ground plane with a low-thermal

and electrical impedance contact. Ideally, this is

achieved by soldering the backside of the package

directly to a top metal ground plane on the PCB.

Alternatively, the EP can be connected to an internal or

bottom-side ground plane using an array of plated vias

directly below the EP. The MAX9986A EV kit uses nine

evenly spaced, 0.016in-diameter, plated through holes

to connect the EP to the lower ground planes.

Depending on the ground-plane spacing, large sur-

face-mount pads in the IF path may need to have the

ground plane relieved under them to reduce parasitic

shunt capacitance. The layout should be such to min-

mize the coupling from L1, L2, and L3.

Modifying the EV Kit

The RF and LO inputs are broadband matched, so

there is no need to modify the circuit for use anywhere

in the 815MHz to 1000MHz RF range (960MHz to

1180MHz LO range).

Retuning for a different IF is as simple as scaling the

values of the IF pullup inductors up or down with fre-

quency. The IF output looks like 200 Ω differential in

parallel with a capacitor. The capacitance is due to the

combination of the IC, PCB, and external IF compo-

nents. The capacitance from the IC is approximately

1pF to ground (0.5pF differential), while that from the

PCB and external components is approximately 1pF to

The IF output is tuned for operation at approximately

200MHz, so a 330nH inductor is used. For lower IF fre-

quency (i.e., larger component values), maintain the

component’s Q value at the cost of larger case size,

unless it is unavoidable.

The DC current of the device can be reduced, but the

performance will be degraded. Reducing the current is

accomplished by increasing the values of R1 and R2.

Resistor R1 sets the current in the IF amplifier, whereas

R2 sets the current in the LO buffer that drives the

mixer core.

Setting R1 to 953 Ω and R2 to 619 Ω results in IF and LO

currents of 130mA and 71mA, respectively. Approxi-

mately 21mA of additional current is used in other

circuits and cannot be reduced. To reduce these adjust-

able currents in half, double the values of R1 and R2.

Doing so would reduce the current to approximately

130mA, but the gain and IP3 would drop approximately

0.3dB and 2.5dB, respectively. Some of the other per-

formance values degrade or improve due to reduced

current.

Since the linearity of the device is a result of the cascaded

performance of the IF amplifier and the mixer, carefully

choose the correct combination of R1 and R2 to pro-

duce the highest IP3 at the lowest desired current.

4

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