LUCW3011FCL-TR View Datasheet(PDF) - Agere -> LSI Corporation

Part Name

Description

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LUCW3011FCL-TR

1 GHz Quadrature Modulator

Agere -> LSI Corporation 

W3011

1 GHz Quadrature Modulator

Data Sheet

September 1999

Offset Mixer (continued)

W3011 Using Offset Mixer

If the W3011 offset mixer is required, two VCOs must be connected (see Figure 6). A low-frequency (VHF)

oscillator may be dc-coupled to either pin 13 (LOLN) or pin 14 (LOLP) if the VCO contains a dc-blocking

capacitor at its output. Otherwise, use a low-impedance series capacitor between the VCO output and the LOL

input. The other LOL pin must be dc-grounded (no external capacitor for the grounded pin). As shown in Figure

1, there is a 50 Ω termination resistor on chip, connected between pins 13 and 14.

In the same way, as shown in Figure 6, one of the pins 11 (LOHN) or 12 (LOHP) must be connected to dc

ground. The other pin is connected to a high-frequency (UHF) VCO, using either dc coupling (if the VCO contains

a dc-blocking capacitor at its output) or a low-impedance series-coupling capacitor. There is also a 50 Ω

termination resistor on chip connected between pins 11 and 12.

When the offset mixer is used, it is necessary to filter the offset mixer output signal with a parallel-tuned LC filter

between pins 9 and 10. The resonant frequency of this filter should be approximately the center of the transmit

RF band (for example, about 920 MHz for PDC 800). The filter should be adjusted for lowest EVM at RFOUT.

1

I

Q

APC φ

ENB

9

10

VCC

20

RFOUT

LOL VCO

14

13

12

11

LOH (UHF) VCO

Figure 6. W3011 Application Using Offset Mixer

8

Lucent Technologies Inc.

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