SL2015 datasheet(3/17 Pages) MITEL

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SL2015

The SL2015 is a downconverter mixer oscillator with an

output AGC amplifier, when used with appropriate external

varactor tuned oscillator sustaining network 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 on-board oscillator. The

oscillator block uses an external tunable sustaining network

and is optimised for low phase noise. This section also

contains a buffer drive whose outputs can be used to

frequency lock the LO carrier to the required channel.

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 VCO application circuit

6.2nH

TO DEVICE

0.7pF

6mm STRIPLINE

Fig. 5 LO phase noise variation with frequency (typical)

2 x 1T379

10k

Ω

Vcnt

0.75p

TANK

TANKB

0.75p

6mm STRIPLINE

SL2015 phase noise

-78.00

-76.00

-74.00

-72.00

-70.00

-68.00

-66.00

-64.00

-62.00

1400

1600

1800

2000

2200

2400

2600

2800

LO frequencyMHz

LO frequency MHz

Lo frequency MHz

SL2015 phase noise

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