Agilent Technologies N1022A Manuel d'utilisateur télécharger pdf (Page 22)

Differential Voltage Probes Overview

Differential probes are active

probes with two inputs, one posi-

tive and one negative, as well as a

separate ground lead. They are

used to look at signals that are

referenced to each other instead

of earth ground and to look at

small signals in the presence of

large dc offsets or other common

mode signals such as noise. The

differential amplifier in the probe

rejects signals that are common

Figure 4.1. Agilent 1153A for probing

low-bandwidth differential signals.

Model Probe Type Applications and Use Page

1153A Active Differential Measure low-bandwidth differential signals 23

1130A/31A/32A/34A Active Diff/SE Measure both differential and single-ended signals up to 7 GHz 10

1168A/69A Active Diff/SE Measure both differential and single-ended signals up to 13 GHz 13

Differential Probe Advantages Limitations

View small signals in the presence of dc or More expensive than general-purpose probes

other common mode signals Less dynamic range than using two passive probes

1153A probes both low- and high-voltage 200 MHz bandwidth

differential signals with low thermal drift

1168A/69A and 1130A/31A/32A/34A probes both Lower dynamic range and maximum input voltage

single-ended and differential signals up to

13 GHz bandwidth

to the two inputs, removing the

dc or common mode signals and

leaving the signal of interest. The

common mode rejection ratio

(CMRR) characterizes how effec-

tively the probe rejects signals

common to each input. The CMRR

for differential signals is much

higher than using two passive

probes and subtracting the sig-

nals with a math function.

Differential probes are used with

RF communication ICs, semicon-

ductor characterization (RAM-

BUS, Double Data Rate, DRAM,

AGP), battery-powered communi-

cation and computing equipment

(cellular phone, laptop computer,

etc.), disk drive read-write chan-

nel signals, power supply design

and verification, motor speed

controls, electronic high-power

converters, and other applica-

tions where signals are “floating”

above ground.

Figure 4.2. Agilent 1130A InfiniiMax

probe amplifier and E2675 differential

browser probe head, ordered separately.

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Agilent Technologies N1022A Manuel d'utilisateur Page 22

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