HMC714LP5 datasheet(29/40 Pages) HITTITE

29 / 40 page

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12 - 142

Channel isolation/interference is grouped into two

categories:

On-chip inter-channel interference, and

Off-chip inter-channel interference.

Off-chip

interference

between

channels

should

considered,

especially

small

signal

levels,

since

HMC714LP5E is capable of detecting a signal over a

very wide dynamic range (70 dB+). There are two main

mechanisms through which the interference between the

channels may affect measurement accuracy. The first

one is the direct coupling of the RF signal from one RF

channel input to the other RF channel input. Baluns on the

detector inputs usually contribute to inter-channel coupling,

as does PC board design and the quality of the soldered

connections.

On-chip inter-channel interference, herein referred to as

“input-output channel isolation”, usually manifests itself as

drift on one detector output due to a relatively strong signal

present at the other detector input. Quantitatively, the input-

output channel isolation is defined as the difference between

the input power levels at both channels when the interfering

(higher power level) channel causes a 1 dB measurement

drift in the interfered (lower power level) channel. Worst

case channel interference occurs when one channel has an

input signal level just over its detection threshold.

Input-Output Channel isolation for HMC714LP5E is:

55+ dB input-output isolation at 900 MHz

45 dB input-output isolation up to 2.7 GHz

35 dB input-output isolation up to 5.8 GHz.

If the same signal frequency is injected into both channels

for this Input-Output Channel Isolation measurement, the

interference will manifest as a phase delay. A slight offset in

signal frequency between the two channels can be seen as a

ripple at the output of the channel with the lower power level

applied at its input. Peaks in the output ripple correspond

to the worst-case phase shift for input-output interference.

The frequency of the output ripple will be equal to the “beat”

frequency between the two channels. The magnitude of

the output ripple will depend on the integration and offset

capacitors connected to CINT and COFS pins, respectively.

The output ripple is reduced by increasing the value of

the integration capacitance (CINT), thereby decreasing

the integrator bandwidth. The data was collected using a

100kHz offset between the channels.

0.5

1.5

2.5

-30

-25

-20

-15

-10

-5

0.5 GHz

0.9 GHz

1.9 GHz

2.7 GHz

3.9 GHz

5.8 GHz

CHANNEL B INPUT POWER (dBm)

0.5

1.5

2.5

-30

-25

-20

-15

-10

-5

0.5 GHz

0.9 GHz

1.9 GHz

2.7 GHz

3.9 GHz

5.8 GHz

CHANNEL A INPUT POWER (dBm)

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0.5

1.5

2.5

3.5

4.5

5.5

Input A->Input B

Input B->Input A

FREQUENCY (GHz)

Input to Input Isolations with

ETC1-1-13 Baluns

Interference to an Input Signal (INB

Power Fixed) with Interfering Signal on

the other Channel (INA Power Swept) [1]

Interference to an Input Signal (INA

Power Fixed) with Interfering Signal on

the other Channel (INB Power Swept) [1]

Channel Isolation/Interface

HMC714LP5 / 714LP5E

v05.0309

DUAL RMS POWER DETECTOR

0.1 - 3.9 GHz

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