AD8364ACPZ-WP(RevB) View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD8364ACPZ-WP
(Rev.:RevB)

LF to 2.7 GHz Dual 60 dB TruPwr™ Detector

Analog Devices 

AD8364

DESCRIPTION OF CHARACTERIZATION

The general hardware configuration used for most of the

AD8362 characterization is shown in Figure 81. The signal

sources used in this example are the Rohde & Schwarz SMIQ03B

and Agilent E4438C. Input-matching baluns are used to transform

the single-ended RF signal to its differential form. Due to the

differential inputs’ sensitivity to amplitude and phase mismatch,

specific baluns were used for each characterization frequency to

achieve the best performance.

Other selected configurations are shown in Figure 82 and

Figure 83 as well.

SIGNAL

SOURCE

–3dB

SIGNAL –3dB

SOURCE

OUTA

INA

AD8364

CHARACTERIZATION

OUTB

OUTP

BOARD

INB

OUTN

VREF

TEMP

AGILENT

34970A

METER/

SWITCHING

COMPUTER

CONTROLLER

Figure 81. General Characterization Configuration

AGILENT 8648

RF SOURCE

–6dB SPLITTER

50Ω

–8dB

AD8340 OR

AD8341 VECTOR

MODULATOR

MINI-CIRCUITS

ZHL–42Ω

–8dB

–6dB

INHA/B

–9dB

–8dB

–6dB

INLA/B

Figure 82. Configuration for Amplitude and Phase Mismatch

Characterization

Data Sheet

BASIS FOR ERROR CALCULATIONS

The slope and intercept are derived using the coefficients of a

linear regression performed on data collected in its central

operating range. Error is stated in two forms: (1) error from

linear response to CW waveform and (2) output delta from

25°C performance.

The error from linear response to CW waveform is the decibel

difference in output from the ideal output defined by the

conversions gain and output reference. This is a measure of the

linearity of the device response to both CW and modulated

waveforms. The error in dB is calculated by

( ) Error (dB) = VOUT − Slope × PIN − PZ

Slope

where PZ is the x-axis intercept expressed in dBm. This is

analogous to the input amplitude that would produce an output

of 0 V, if such an output was possible.

Error from the linear response to the CW waveform is not a

measure of absolute accuracy, since it is calculated using the

slope and intercept of each device. However, it verifies the

linearity and the effect of modulation on the device’s response.

Similarly, error from 25°C performance uses the 25°C

performance of a given device and waveform type as the

reference from which all other performance parameters shown

alongside it are compared. It is predominantly (and most often)

used as a measurement of output variation with temperature.

Rev. B | Page 38 of 44

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