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AN9614

更新时间： 2024-01-31 03:41:20

品牌	Logo	应用领域
英特矽尔 - INTERSIL		ISM频段
页数	文件大小	规格书
3页	51K
描述
Using the PRISM㈢ Chip Set for Low Data Rate Applications

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AN9614 数据手册

Using the PRISM® Chip Set for Low

Data Rate Applications

Application Note

January 1997

AN9614.1

Authors: Carl Andren and John Fakatselis

Introduction

Description

™

The PRISM chip set has been

A. External IF Filtering

optimized to address high data rate

applications with up to 4 MBPS data

rates. The PRISM can also be utilized

for low data rate applications. To

The band pass ﬁlters shown between the HFA3624 and the

HFA3724 labeled as BPF1a and BPF1b on Figure 1 are

centered at IF and ﬁlter the spread wideband waveform

before demodulation on the receive side and before the ﬁnal

upconversion on the transmit side.

implement low data rate applications (below 250 KBPS) the

designer needs to address design considerations in the

following areas:

One might think that the TX ﬁlter can be avoided but it is

required to meet the sidelobe suppression speciﬁcations

according to FCC requirements.

A. Selection of external ﬁltering supporting the PRISM com-

ponents.

For the high rate conﬁguration of the PRISM, a

recommended implementation is to use SAW BPFs centered

at 280MHz with a BW of about 17MHz. This is assuming an

11MHz chip rate (thus 22MHz spread null to null bandwidth).

A recommended device that meets these requirements is

the ToyoCom TQS-432.

B. Limitations on ﬁlter cut off frequencies of the HFA3724

internal Low Pass Filters.

C. Selection of appropriate carrier and clock oscillators to

achieve the desired performance, given the HSP3824 inter-

nal Acquisition and Tracking loop integration constraints.

The system designer should also evaluate the option where

the radio maintains its high data rate conﬁguration but

transmits the data using infrequent high data rate burst

packets.

If a low data rate conﬁguration is implemented then

substitute IF ﬁlters need to be identiﬁed that will ﬁlter to the

channel bandwidth of the spread waveform at the lower chip

rate. The designer can use any IF center frequency within

the HFA3724 range. The designer must be sure, though, that

the identiﬁed ﬁlter meets the transmission spectral mask

requirements for FCC for the 2.4MHz ISM band. SAW ﬁlters

Where the system requires that the radio operate at low

rates (<250 KBPS), the designer must address the areas

highlighted on the PRISM block diagram shown in Figure 1.

PRISM PCMCIA Reference Radio Block Diagram

TX/RX

FILTER CUTOFF

SELECT

ANTSEL

SELECT

HFA3724

Q MODEM

ADC

CCA

QUADRATURE

DEMOD

LNA

RF2304

I ADC

BPF1a

BPF1b

DE-

SPREAD

DE-

MOD

Q ADC

HFA3424

LNA

HFA3624

RF/IF

LIMITING IF /RSSI

TX/RCV

DATA

HSP3824

BASEBAND

PROCESSOR

I/Q LO

28SSOP

MOD/

ENCODE

CONTROL

TEST

I/O

SPREAD

CLK

HFA3925

QUADDRATURE

MODULATOR

RF POWER AMP

AND TX/RX

SWITCH

5TH ORDER

BUTTERWORTH

LOW PASS

VCO

OSC

22MHz

FILTERS

HFA3524

DUAL SYNTHESIZER

FIGURE 1. PRISM™ CHIP SET BLOCK DIAGRAM

PRISM and PRISM logo are trademarks of Intersil Corporation.

4-236

12 3

中文翻译

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