TSH80-TSH81-TSH82

Testing Conditions

17/23

4.3

Video capabilities:

To characterize the differential phase and differential gain a CCIR330 video line is used.

The video line contains 5 (flat) levels of luma on which is superimposed chroma signal. (the first

level contains no luma). The luma gives various amplitudes which define the saturation of the

signal. The chrominance gives various phases which define the color of the signal.

Differential phase (respectively differential gain) distortion is present if a signal chrominance

phase (gain) is affected by luminance level. They represent the ability to uniformly process the

high frequency information at all luminance levels.

When differential gain is present, color saturation is not correctly reproduced.

The input generator is the Rhode & Schwarz CCVS. The output measurement is done by the

Rhode and Schwarz VSA.

Figure 32. Measurement on Rhode and Schwarz VSA

Table 6.

Video results

Parameter

Value (Vcc=

±2.5V)

Value (Vcc=

±5V)

Unit

Lum NL

0.1

0.3

%

Lum NL Step 1

100

100

%

Lum NL Step 2

100

99.9

%

Lum NL Step 3

99.9

99.8

%

Lum NL Step 4

99.9

99.9

%

Lum NL Step 5

99.9

99.7

%

Diff Gain pos

0

0

%

Diff Gain neg

-0.7

-0.6

%

Diff Gain pp

0.7

0.6

%

Diff Gain Step1

-0.5

-0.3

%

Diff Gain Step2

-0.7

-0.6

%

Diff Gain Step3

-0.3

-0.5

%

Diff Gain Step4

-0.1

-0.3

%

Diff Gain Step5

-0.4

-0.5

%

Diff Phase pos

0

0.1

deg

Diff Phase neg

-0.2

-0.4

deg

Diff Phase pp

0.2

0.5

deg

Diff Phase Step1

-0.2

-0.4

deg

Diff Phase Step2

-0.1

-0.4

deg

Diff Phase Step3

-0.1

-0.3

deg

Diff Phase Step4

0

0.1

deg

Diff Phase Step5

-0.2

-0.1

deg