STW82103B datasheet(30/67 Pages) STMICROELECTRONICS

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General description

STW82103B

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Doc ID 018517 Rev 2

Table 11 and Table 12 give the current consumption and the phase noise at 1 MHz.

8.1.10

Output stage

The differential output signal of the synthesizer after the Divider by 2 for VCOA and directly

for VCOB is available on pins 16 and 17.

The output stage is selected by programming the PD[4:0] bits.

The output stage is an open-collector structure which is able to meet different requirements

over the desired output frequency range by proper connections on the PCB. See Figure 27:

Diversity mode operation with same LO frequencies.

8.1.11

External VCO buffer

Although the STW82103B includes two wideband and low-noise VCOs, external VCO use

capability is also provided.

The external VCO buffer can be used to manage a signal coming from an external VCO in

order to build a local oscillator signal by using the STW82103B internal synthesizer as a

PLL. This is only possible when External VCO standard mode or External VCO diversity

master mode operation are selected. See Figure 29: External VCO standard mode

operation and Figure 30: External VCO diversity mode operation with same LO.

If the STW82103B is operated in Diversity slave mode, the external VCO buffer manage the

signal coming from the synthesizer output stage of another STW82103B device See

Figure 27: Diversity mode operation with same LO frequencies and Figure 30: External

VCO diversity mode operation with same LO.

The selection of the external VCO buffer is done by setting the PD[4:0] bits.

The external VCO signal can range from 2200 MHz to 3000 MHz and its minimum power

level must be -10 dBm.

Table 11.

VCOA performance against amplitude setting (frequency = 4.6 GHz)

PLL_A[1:0]

Current

Consumption (mA)

PN @ 1 MHz

-124

-125

-127

-128

Table 12.

VCOB performance against amplitude setting (frequency = 2.8 GHz)

PLL_A[1:0]

Current

Consumption (mA)

PN @ 1 MHz

-129

-131

-133

-134

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