AD8364ACPZ-R2 datasheet(38/44 Pages) AD

38 / 44 page

AD8364

Data Sheet

Rev. C | Page 38 of 44

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 the differential form. Due to the

differential input 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.

COMPUTER

CONTROLLER

AGILENT

34970A

METER/

SWITCHING

AD8364

CHARACTERIZATION

BOARD

OUTA

OUTB

OUTP

OUTN

VREF

TEMP

INA

INB

–3dB

SIGNAL

SOURCE

–3dB

SIGNAL

SOURCE

Figure 81. General Characterization Configuration

–8dB

–6dB

INLA/B

Ω

AGILENT 8648

RF SOURCE

–6dB SPLITTER

–8dB

–9dB

AD8340 OR

AD8341 VECTOR

MODULATOR

–8dB

–6dB

INHA/B

MINI-CIRCUITS

ZHL–42W

Figure 82. Configuration for Amplitude and Phase Mismatch

Characterization

BASIS FOR ERROR CALCULATIONS

The slope and intercept are derived using the coefficients of a

linear regression performed on data collected in the 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) =

(

)

Slope

OUT

−

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

to the input amplitude that produces 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 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.

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