SA5219N(1997) 데이터 시트보기 (PDF) - Philips Electronics

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SA5219N
(Rev.:1997)

Wideband variable gain amplifier

Philips Electronics 

Philips Semiconductors

Wideband variable gain amplifier

Product specification

SA5219

50Ω

SOURCE

4:1 TURNS RATIO

LC TUNED

TRANSFORMER

+5V

5219

50Ω

VAGC

+1V

Figure 8. Narrowband Gain Optimization

50Ω

OUTPUT

This circuit will exhibit approximate-

ly an 8dB noise figure and 25dB gain.

SR00280

50Ω

SOURCE

+5V

50Ω

5219

50Ω

VAGC

+1V

Figure 9. Simple Amplifier Configuration

50Ω

OUTPUT

The noise figure of this configuration

will be approximately 15dB.

SR00281

50Ω

SOURCE

+5V

5219

50Ω

VAGC

+1V

Figure 10. Unterminated Configuration

50Ω

OUTPUT

With the 50Ω source left untermi-

nated, the noise figure is 9dB.

SR00282

+5V

50Ω

SOURCE

50Ω

OUTPUT

5219

VBG

VAGC

R1

R2

Gain = 19dB + 20log10 VAGC

50Ω

ƪ ƫ where VAGC =

R2

R1 ) R2

VBG

and is in units of Volts, for VAGC ≤ 1V

SR00283

Figure 11. User-Programmable Fixed Gain Block

1997 Nov 07

7

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