SL2017 Ver la hoja de datos (PDF) - Mitel Networks

Número de pieza

componentes Descripción

Fabricante

SL2017

Full Band Satellite Tuner

Mitel Networks 

SL2017

FUNCTIONAL DESCRIPTION

The SL2017 is a downconverter mixer with an output AGC

amplifier, which when used with appropriate external varactor

tuned oscillator performs the first IF tuning function for a full

band satellite receiver system. A block diagram is contained

in Fig. 2.

In application the RF input of the device is interfaced

through appropriate impedance matching to the first IF

signal, which is downlinked from the outdoor unit at typically

950-2150MHz. The RF input preamplifier of the device is

designed for low noise figure and for low distortion so

eliminating the requirement for RF AGC. The preamplifier

also provides gain to the mixer section and back isolation from

the local oscillator section.

The output of the preamplifier is fed to the mixer section

where the RF signal is mixed with the local oscillator

frequency, which is generated by an external oscillator.

Signals from the mixer are fed to the AGC IF amplifier,

which gives an overall conversion gain programmable from

-10 to +30dB. The output of this stage can be switched to one

of two outputs to facilitate IF processing.

6.2nH

0.7pF

TO DEVICE

Fig. 3 RF input matching network

DV1

IT379

TL1

2

4

SNIFFER

Varactor Line

5V C19

100nF

L1

10nH

C21

100pF

R1

2K7

C12

DV2 100pF

1

BFR182

TR2

3 IT379

R11

22

C52

0.5pF

R6 R2 NC R3

22K 5K6 C18 270

C17

0.5pF

1nF

C10

1nF

5V

3

C4

100pF

4

5V

C5

5

100pF

C20

47pF

6

C22

7

47pF

8

RF INPUT

Vcc RF

Vcc LO

LO

LO B

Vee LO

C23

2p2F

RF B

RF

C24

100pF

Fig. 4 Typical external VCO application circuit

+j1

+j0.5

+j2

+j0.2

+j5

0

0.2

0.5

1

2

5

X

–j0.2

–j5

S11:Z0 = 50 Ω

NORMALISED TO 50 Ω

–j0.5

X

X XX

–j2

–j1

FREQUENCY MARKERS AT 1.3GHz,

1.8GHz, 2.3GHz, 2..8GHz

Fig. 5 LO buffer input impedance

3

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