Data Sheet

ADL6010

Rev. B | Page 17 of 22

BASIC CONNECTIONS

The basic connections are shown in Figure 37. A dc supply of

nominally 5 V is required. The bypass capacitors (C1 and C2)

provide supply decoupling for the output buffer. Place these

capacitors as close as possible to the VPOS pin. The exposed

pad is internally connected to the IC ground and must be

soldered down to a low impedance ground on the PCB. A filter

values allow a quicker response to an RF burst waveform, and

Figure 37. Basic Connections

PCB LAYOUT RECOMMENDATIONS

Parasitic elements of the PCB such as coupling and radiation

limit accuracy at very high frequencies. Ensure faithful power

transmission from the connector to the internal circuit of the

ADL6010. Microstrip and CPW are popular forms of

transmission lines because of their ease of fabrication and low

cost. In the ADL6010 evaluation board, a grounded CPW

(GCPW) minimizes radiation effects and provides the maximum

bandwidth by using two rows of grounding vias on both sides

of the signal trace.

Figure 38 shows the PCB layout of the ADL6010 evaluation

board in detail. Minimize air gaps between the vias to ensure

reliable transmission. Because a certain minimum distance

between two adjacent grounding vias in a single row is needed,

adding a second row of grounding vias on both sides of the

GCPW is recommended. In this way, a much smaller equivalent

air gap between grounding vias is achieved, and better

transmission is accomplished.

Figure 38. ADL6010 Evaluation Board

SYSTEM CALIBRATION AND ERROR CALCULATION

The measured transfer function of the ADL6010 at 10 GHz is

shown in Figure 39. This plots both the conformance error and

the output voltage vs. the input level at +25°C, +85°C, +125°C,

−40°C, and −55°C. Over the input level range from −30 dBm to

+15 dBm, the output voltage varies from approximately 20 mV

to 4.3 V.

Various Temperatures (−55°C, −40°C, +25°C, +85°C, and +125°C) at 10 GHz

Using Two Point Calibration

To achieve the highest measurement accuracy, perform

calibration at the board level, as the IC scaling varies from

device to device.

Calibration begins by applying two or more known signal levels,

measurements, the slope and intercept of the scaling is extracted.

For a two point calibration, the calculations are as follows:

where:

input impedance.

Once the slope and intercept are calculated and stored, use the

following simple equations to calculate the unknown input power:

The conformance error is

Figure 39 includes a plot of this error at −55°C, −40°C, +25°C,

+85°C, and +125°C when using a two point calibration with

inputs at +5 dBm and –20 dBm. The relative error at these two

calibration points is equal to 0 dB by definition.

RFIN

RFCM

VOUT

COMM

(SEE TEXT)

R1

100Ω

VPOS

C1

100pF

C2

0.1µF

4

5

6

3

2

1

LINEARIZER

ADL6010

GND

VIAS

RFIN

PAD

4

3

2

1

0

–1

–2

–3

–4

10

1

0.1

0.01

0.001

–55°C

–40°C

+25°C

+85°C

+125°C

15

5

–5

–15

–25

20

10

0

–10

–20

–30

CALIBRATION AT –20dBm AND +5dBm