Philips Semiconductors

Product data

NE/SE5539

High frequency operational amplifier

2002 Jan 25

9

NE5539 COLOR VIDEO AMPLIFIER

The NE5539 wideband operational amplifier is easily adapted for

use as a color video amplifier. A typical circuit is shown in Figure 7

along with vector-scope1 photographs showing the amplifier

differential gain and phase response to a standard five-step

modulated staircase linearity signal (Figures 8, 9 and 10). As can be

seen in Figure 9, the gain varies less than 0.5% from the bottom to

the top of the staircase. The maximum differential phase shown in

Figure 10 is approximately +0.1

°.

The amplifier circuit was optimized for a 75

Ω input and output

termination impedance with a gain of approximately 10 (20 dB).

NOTE:

7

75

750

—V

22nF

14

—

10

8

3

1

+

75

VIN

—V

22nF

470

75

—V

ZO = 75Ω

1

6dB LOSS—1

75

SL00576

Figure 7. NE5539 Video Amplifier

SL00577

Figure 8. Input Signal

SL00578

Figure 9. Differential Gain <0.5%

NOTE:

Instruments used for these measurements were Tektronix 146

NTSC test signal generator, 520A NTSC vectorscope, and 1480

waveform monitor.