SA5219(1997) Просмотр технического описания (PDF) - Philips Electronics

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производитель

SA5219
(Rev.:1997)

Wideband variable gain amplifier

Philips Electronics 

Philips Semiconductors

Wideband variable gain amplifier

Product specification

SA5219

CRYSTAL

FILTER

RF INPUT

50Ω

SOURCE

5219

VAGC

+5V

5219

VAGC

.5V

R

9R

FULL CARRIER

AM (DSB)

50Ω

OUTPUT

50Ω

+5V

All harmonic distortion products will be

at least -50dBc over the audio spectrum.

Figure 12. AM Modulator

MODULATING

SIGNAL

SR00284

5219

5219

50Ω

OUTPUT

VAGC

50Ω

VAGC

The high input impedance to the NE5219 makes matching

to crystal filters relatively easy. The total delta gain of this

system will approach 80dB. IF frequencies well into the UHF

region can be configured with this type of architecture.

Figure 13. Receiver AGC IF Gain

RS

VS ±

RT

RT

VCC (+5V, unless otherwise noted)

5219

± VAGC

RL

RL

Figure 14. Test Set-up 1 (Used for all Graphs)

SR00286

GAIN CONTROL

SIGNAL

SR00285

1997 Nov 07

8

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