MP1S datasheet(3/17 Pages) MITEL

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SL2017

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.

FUNCTIONAL DESCRIPTION

Fig. 3

RF input matching network

Fig. 4 Typical external VCO application circuit

6.2nH

TO DEVICE

0.7pF

Fig. 5 LO buffer input impedance

0.5

0.2

+j0.2

+j0.5

+j1

+j2

+j5

–j5

–j2

–j1

–j0.5

–j0.2

FREQUENCY MARKERS AT 1.3GHz,

S11:Z0 = 50 Ω

NORMALISED TO 50

Ω

1.8GHz, 2.3GHz, 2..8GHz

C20

47pF

C22

47pF

1nF

100pF

C10

1nF

Varactor Line

2K7

5K6

270

C12

100pF

DV1

IT379

C17

0.5pF

C18

DV2

IT379

22K

TR2

BFR182

C21

100pF

C19

100nF

C52

0.5pF

10nH

TL1

SNIFFER

R11

RF B

C23

2p2F

C24

100pF

RF INPUT

Vcc RF

LO B

Vcc LO

Vee LO

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