STW82103B datasheet(31/67 Pages) STMICROELECTRONICS

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STW82103B

General description

Doc ID 018517 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

2875 MHz ÷ 3000MHz

001

2750 MHz ÷ 2875 MHz

010

2640 MHz ÷ 2750 MHz

011

2530 MHz ÷ 2640 MHz

100

2435 MHz ÷ 2530 MHz

101

2350 MHz ÷ 2435 MHz

110

2280 MHz ÷ 2350 MHz

111

2200 MHz ÷ 2280 MHz

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