OPA360

SB0S294C − DECEMBER 2003 − REVISED JULY 2004

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7

A capacitor placed in parallel with the resistor (Figure 1)

creates an additional filter pole that provides additional

stop-band attenuation. With a 200

Ω source impedance, a

67pF ceramic capacitor provides approximately 28dB

attenuation at 27MHz without affecting the pass band.

VIDEO PERFORMANCE

Industry standard video test patterns include:

check for basic frequency response.

modulated

at

different

frequencies to test for comprehensive measurement

of amplitude and group delay errors across the video

baseband.

tude, phase and some distortion

the worst case signal swing required by the amplifier.

Performance on these test signals are shown.

Figure 2 shows the test circuits for Figure 3 through

Figure 13 and Figure 16. (NOTE: 1 and 2 indicate

measurement points corresponding to the waveforms

labeled 1 and 2 in the figures.)

1

2

a. Test circuit for Figures 3−5.

2

d. Test circuit for Figures 7, 12, and 13.

1

c. Test circuits for Figures 10 and 11.

2

1

1

1

2

b. Test circuit for Figures 6, 8, and 16.

220

µF

22

µF

C

OUT

22

µF

NOTE: 1 and 2 indicate measurement points corresponding to the waveforms labeled 1 and 2 in the figures.

SAG

47

µF

22

µF

Figure 2. Test Circuits Used for Figures 2−13