STW82102B datasheet(31/67 Pages) STMICROELECTRONICS

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STW82102B

General description

Doc ID 018516 Rev 2

31/67

8.1.12

Mixer and IF amplifier

LO mixer driver

The LO signal is fed through a driver in order to achieve the high power level needed to drive

the passive mixer for maximum performance of linearity and NF.

The LO Mixer Driver is coupled to the mixer with an integrated LO balun. The LO signal level

is adjusted by means of an Automatic Level Control loop (ALC) controlled by the bits

LO_A[1:0].

In low current mode the configuration LO_A[1:0]=’00’ (minimum LO amplitude) should be

selected and the power supply on pin 40 can be set to 3.3 V.

The LO balun resonating frequency can be adjusted by means of the bits CAP[2:0] in order

to match the selected LO frequency.

Mixer

A doubly balanced CMOS passive mixer is internally driven by the high level LO signal in

order to achieve high linearity and low noise performance.

The RF integrated balun permits the removal of external components and it is internally

matched to 50 ohms.

The gate bias of the CMOS devices in the mixer is programmable with 4 bits (MIX[3:0]) to

optimize the input matching and the gain of the signal chain.

Higher values of gate bias (higher decimal values of MIX[3:0]) are suggested to maximize

linearity and lower values to maximize the performance of Gain and NF.

Table 13.

Suggested CAP[2:0] values for LO Frequency range mixer

CAP[2:0]

LO frequency range

000

2100 MHz ÷ 2200 MHz

001

1970 MHz ÷ 2100 MHz

010

1870 MHz ÷ 1970 MHz

011

1770 MHz ÷ 1870 MHz

100

1700 MHz ÷ 1770 MHz

101

1620 MHz ÷ 1700 MHz

110

1550 MHz ÷ 1620 MHz

111

1500 MHz ÷ 1550 MHz

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