RF3000 データシートの表示（PDF） - RF Micro Devices

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RF3000

SPREAD-SPECTRUM BASEBAND MODEM

RF Micro Devices 

RF3000

General Description

RFMD 2.4 GHz WLAN

System Block Diagram

RX

TX

IF Amp

PA

Driver

+45°

÷2

-45°

Σ

TX

Fc = 2442

MHz

RF2948

RX VGC

ANT Select

RXVGC

DAC

Base Band Amp.

Active Selectable LPF

(fC = 1 MHz to 35 MHz)

0-30 dB Gain

RX Q DATA

Q-IN

ADC

VREF Data Converter

Reference

RX I DATA

I-IN

ADC

VREF_1

TX VGC

TXVGC

DAC

Filter

TX I DATA

I-OUT

DAC

TX Q DATA

Q-OUT

DAC

Filter

Selectable

LPF

RF3000

CCA

RX

VGC

802.11

Preamble/

Header

Control

Port

Mode Control

802.11

Preamble/

Header

Tx Length

Tx Signal

Service

CCA

LNA GS

RX DATA

RX RDY

DATA CLK

SPI

TX RDY

TX DATA

RX PE

TX PE

MCLK

Fc = 2442

MHz

IF

VCO

RF

VCO

IF

SAW

RX

Fc = 374 MHz

Gain

Select

LNA

Dual Gain Modes

Filter

Fc = 2442

Mhz

Antenna 1

Antenna 2

T/R

Switch

Diversity

Switch

RF

Figure 4. 2.4GHz IEEE802.11b Chipset Diagram

Figure 4 shows the complete 2.4GHz chipset, and where the RF3000 fits into the system. Figure 5 shows a simplified

block diagram of the RF3000. The RF3000 is a complete spread-spectrum transceiver, allowing PSK system operation.

The RF3000 performs all of the functions necessary to modulate a digital data source for transmission in a wireless envi-

ronment. The RF3000: handles preamble and header generation and extraction; automatic gain control; clear channel

assessment; antenna diversity; and, implements an equalizer to handle multi-path events at high data rates.

Rev A4 031216

11-327

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