NE5209N Philips, NE5209N Datasheet - Page 7

• Manufacturer Part Number: NE5209N
• Description: Wideband variable gain amplifier
• Manufacturer: Philips

Philips Semiconductors
1990 Aug 20
Wideband variable gain amplifier
SOURCE
SOURCE
SOURCE
50
50
SOURCE
50
SOURCE
50
50
Figure 6. Narrowband Noise Optimization
Figure 8. Narrowband Gain Optimization
Figure 9. Simple Amplifier Configuration
Figure 7. Broadband Gain Optimization
Figure 10. Unterminated Configuration
2:1 TURNS RATIO
LC TUNED
TRANSFORMER
MINI CIRCUITS
4:1 BALUN OR
EQUIVALENT
4:1 TURNS RATIO
LC TUNED
TRANSFORMER
1 : 4
50
7
+5V
+1V
+5V
+1V
+5V
+1V
+5V
+1V
+5V
+1V
5209
5209
5209
5209
5209
V
V
V
V
V
AGC
AGC
AGC
AGC
AGC
50
50
50
50
50
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
50
50
50
50
50
This circuit will exhibit about a 7dB
noise figure with approximately
22dB gain. Narrowband circuits
have the advantage of greater stabil-
ity, particularly when multiple de-
vices are cascaded.
This circuit will exhibit about an 8dB
noise figure with 24dB gain.
This circuit will exhibit approximate-
ly an 8dB noise figure and 25dB gain.
The noise figure of this configuration
will be approximately 15dB.
With the 50
nated, the noise figure is 9dB.
NE/SA5209
source left untermi-
Product specification
SR00243
SR00245
SR00242
SR00244
SR00246