PBL40215 Просмотр технического описания (PDF) - Ericsson

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PBL40215

RF Transceiver circuit for the Digital Enhanced Cordless Telecommunications (DECT) system

Ericsson  

Image Reject Front End.

π/4

-π/4

÷2

IR RX

PBL 402 15

The image reject front end consists of an LNA (Low Noise Amplifier) with dual outputs, 2 mixers, quadrature LO generation, 2

low pass filters, a +π/4 and a -π/4 all-pass filters and a summing output stage.

The receiver input is a 1.9 GHz LNA with a characteristic balanced input impedance. The inputs are self biassing and require

external matching to the source, with DC blocking capacitors if the source passes DC.

The high side image rejection mixer, down converts from RF to an IF frequency of 110.6 MHz.

The IF outputs are self biasing and define a balanced output impedance of 300 Ω. The output should be matched to an

external adjacent channel filter.

The gain is switchable to cater for the insertion loss of different external filters.

Image Reject Front End Table.

Parameter

Input frequency range

Output frequency range

Gain 1

Gain 2

Input IP3

Input 1 dB compression

Output 1 dB compression

Output saturation

Lower image suppression

Noise figure

Input impedance

Output impedance

Input VSWR

Output VSWR

Condition

RX_G = 0

RX_G = 1

RX_G = 0

RX_G = 1

RX_G = 0

RX_G = 1

Tested at ƒIN -2•110.6 MHz

Symbol

ƒIN

ƒOUT

G1

G2

IP3

CPI1

CPO1

SSB

NF

ZIN

ZOUT

VSWRI

VSWRO

Min.

1800

100

18

23

-21

29

Typ.

1890

110.6

20

25

-17

-23

-24

-31

-7

-1.5

35

3.6

100

300

Max.

2000

120

22

27

4.1

1.5:1

1.5:1

Unit

MHz

MHz

dB

dB

dBm

dBm

dBm

dBm

dB

dB

Ω

Ω

-

-

19

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