ADRF6780ACPZN-R7 datasheet(25/35 Pages) AD

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Data Sheet

ADRF6780

Rev. D | Page 25 of 35

LO INPUT DRIVEN DIFFERENTIAL vs. SINGLE ENDED

This section provides performance measurements that compare

the ADRF6780 using a differential LO input vs. a single-ended

LO input. When the device uses a single-ended configuration,

LOIP drives while LOIN terminates to 50 Ω.

The subharmonic measurement compares the two settings.

The LO input was set to doubler mode (×2) at a LO frequency

of 9 GHz, and the I/Q mode was set with a 10 MHz sine wave.

Table 6 represents the output frequencies of the upper sideband,

the lower sideband, and the LO leakage at the fundamental output

as well as the subharmonic output frequency at a maximum gain.

Table 6. LO Single-Ended vs. Differential Configuration Performance

Mode

LO Input

Power (dBm)

Fundamental Output

Subharmonic Output

Wanted Upper

Sideband,

LO – I/Q (dBm)

Unwanted Lower

Sideband,

LO + I/Q (dBm)

LO Leakage

(dBm)

Unwanted Upper

Sideband,

LO/2 – I/Q (dBm)

Unwanted Lower

Sideband,

LO/2 + I/Q (dBm)

LO/2 Leakage

(dBm)

Single Ended

−10

−2.20

−28.83

−32.36

−16.26

−32.85

−36.16

−6

−2.09

−25.15

−33.22

−18.01

−35.78

−35.46

−1.94

−28.36

−38.08

−22.83

−42.97

−41.50

−2.01

−28.36

−42.58

−20.17

−39.80

−38.08

Differential

−10

−1.84

−24.96

−43.49

−29.66

−51.54

−45.85

−6

−1.85

−27.19

−38.86

−33.18

−51.25

−47.12

−1.84

−29.46

−37.84

−38.04

−56.50

−58.25

−1.85

−29.55

−37.70

−40.08

−58.46

−60.16

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