Linear Technology DC1599A Manuale utente

LTC5583

DESCRIPTION

Demonstration circuit

1599A

is a Mean-Squared Power

Detector featuring the LTC

5583 IC. LTC5583 is a

dual-channel RMS power detector, capable of

measuring two AC signals. It provides 40dB of

channel to channel isolation with no frequency

separation at 2140MHz that is suited for measuring

VSWR.

The LTC5583 is a wide dynamic range Mean Squared

RF Power Detector, operational from 40MHz to 6GHz.

The input dynamic range with ±1dB nonlinearity is

60dB depending on frequency(from –58dBm to

+2dBm, single-ended 50 input). The detector output

voltage slope is normally 30mV/dB, and the typical

output variation over temperature is ±0.5dB at

880MHz.

The DC1599A Demo Circuit is ideal for frequency

operation below 3.0GHz. It has the single ended input

drive to LTC5583. The input A to output B (or input B

to output A) isolation is 33dB at 2.7GHz, and degrades

as input frequency increases. As a result, operating

above 3GHz may require differential input matching for

improved isolation. Temperature performance is

optimized for 2140MHz. Contact LTC applications for

more information.

LTC is a trademark of Linear Technology Corporation

Design files for this circuit board are available. Call the

LTC factory.

Typical Performance Summary (VCC = 3.3V, EN = HIGH, TA = 25°C, unless otherwise noted. Test circuit shown in Figure 1.)

PARAMETER CONDITION VALUE

Supply Voltage 3.1V to 3.5V

Supply Current Envelope detector off 80.5mA

Envelope detector on 90.1mA

Shutdown Current EN = Lo 0.1μA

EN Voltage Low, Chip Disabled

HIGH, Chip Enabled

0.3V max

2V min

EN Input Current V

= 0V

= 3.3V

0μA

100μA

Output Start Voltage No Input Signal Present 0.45V

Rise Time 0.5V to 2.2V, 10% to 90%, C

FLTR

FLTRB

= 8.2nF, FRF = 100 MHz 140nS

Fall Time 2.2V to 0.5V, 90% to 10%, C

FLTR

FLTRB

=8.2nF, FRF = 100 MHz 3.5uS

Input Frequency Range Operation over wider frequency range with reduced performance 40MHz to 6GHz

f =450MHz

Linear Dynamic Range ±1 dB linearity error 63 dB

RF Input Power Range CW, 50Ω, ±1dB Linearity Error -59 to 4 dBm

Slope 29.6mV/dB

Logarithmic Intercept -78.5dBm

DEMO CIRCUI

1599

QUICK START GUIDE

LTC558

DUAL 6GHz RMS POWER DETECTO

LTC5583

Deviation from CW Response 12 dB peak-to-average ratio (4 carrier WCDMA) 0.4

INA to VOB isolation P

INB

= -45dBm, VOB= VOB p

INB

±1 dB, Frequency Separation=0Hz 50dB

INB to VOA isolation P

INA

= -45dBm, VOA= VOA p

INA

±1 dB, Frequency Separation=0Hz 50dB

f =2140MHz

Linear Dynamic Range ±1 dB linearity error 60 dB

RF Input Power Range CW, 50Ω, ±1dB Linearity Error -58 to 2 dBm

Slope 29.6mV/dB

Logarithmic Intercept -77.4dBm

Deviation from CW Response 12 dB peak-to-average ratio (4 carrier WCDMA) 0.3

INA to VOB isolation P

INB

= -45dBm, VOB= VOB p

INB

±1 dB, Frequency Separation=0Hz 40dB

INB to VOA isolation P

INA

= -45dBm, VOA= VOA p

INA

±1 dB, Frequency Separation=0Hz 40dB

f =2700MHz

Linear Dynamic Range ±1 dB linearity error 59 dB

RF Input Power Range CW, 50Ω, ±1dB Linearity Error -56 to 3 dBm

Slope 30mV/dB

Logarithmic Intercept -74.9dBm

Deviation from CW Response 12 dB peak-to-average ratio (WiMAX OFDM) 0.6dB

INA to VOB isolation P

INB

= -45dBm, VOB= VOB p

INB

±1 dB, Frequency Separation=0Hz 33dB

INB to VOA isolation P

INA

= -45dBm, VOA= VOA p

INA

±1 dB, Frequency Separation=0Hz 33dB

Table 1.

Jumper Description

JUMPER FUNCTION RANGE/SETTING (DEFAULT)

JP1 Chip Enable. EN for High, DIS for Lo EN

JP2 VCCN. Power supply to the envelop detector for both channels. HI=on, LO=off LO

JP3 INV. Swap control for the polarity of VODF. HI=(VOB-VOA)+VOS, LO=(VOA-VOB)+VOS LO

QUICK START PROCEDURE

Demonstration circuit

1599

A is easy to set up to

evaluate the performance of the LTC5583. Refer to

Figure 1

for measurement equipment setup and follow

the procedure below:

Connect voltmeter’s negative (-) lead to demo

board GND test point(TP8 or TP9).

Connect voltmeter’s positive (+) lead to the demo

board VOA(TP2) and VOB(TP5) to measure

channel A and channel B output respectively.

Connect DC power supply’s negative (-) output to

demo board GND(TP8 or TP9).

Connect DC power supply’s positive (+) output

(3.1V to 3.5V) to demo board V

test point(TP7).

Do not exceed 3.8V, the absolute maximum

supply voltage.

Set VCCN jumper to LO, to turn off the envelope

detector if not needed.

Set the Swap jumper to LO for:

VODF= (VOA-VOB)+VOS.

Set swap to HI for:

VODF=(VOB-VOA)+VOS

Connect signal generator’s output to demo board

INPUT port (SMA connector J1 for channel A

input, or J2 for channel B input) via coaxial cable.

LTC5583

A 3dB attenuator may be inserted for broadband

input match, the detected power range is shifted

higher by 3dB.

Set the JP1 to EN to enable the IC. Now the detec-

tor is enabled (on) and is ready for measurement.

Apply RF input signal and measure OUTPUT DC

voltages at VOA and VOB.

Do not exceed +18dBm, the absolute maximum RF input

power.

NOTES:

1. The voltage on the EN test point must never exceed V

+ 0.3V.

2. For digitally modulated signals, an oscilloscope can be used to observe the AC components of the output.

3. Suggest to set VCCN LO when envelope detector is not used. This will result in lower power consumption.

4. Temperature compensation values for RT1 and RT2 may be different at different frequencies. See table 1 for

additional information.

Figure 1. Proper Test Equipment Setup

LTC5583

Table 2. Suggested RT1 and RT2 values for the

optimum temperature performance at various RF

input frequencies.

Frequency

(MHz)

RP1

(kΩ)

RP2

(kΩ)

RT1

(kΩ)

RT2

(kΩ)

450Open011.51.13

880Open011.51.13

900Open0110.953

1800Open012.11.5

2140Open09.761.1

2300Open010.51.43

2500Open010.51.43

2700Open08.871.21

LTC5583

R1 0

TP6 ENVB

1nF

C23

100nF

C28

10nF

C15

1nF

TP8

GND 1

C27

1uF

C19

1nF

C14

1nF

C13

1nF

C24

0.3pF

C16

1nF

R9 0

C10

1nF

JP1

DIS

VCC

C31 100pF

INA

C30 100pF

VCC

C29

0.3pF

LTC5583IUF

DECA

VCCA

VCCR

VCCB

DECB

INPB

INNB

RP2

FLTRB

ENVB

INV

VOB 13

RT2 14

VOS 15

VODF 16

RT1 17

VOA 18

VCCN 19

ENVA 20

FLTRA 21

RP1 22

INNA 23

INPA 24

C17

1nF

TP1 ENVA

TP7

VCC 1

100nF

C11

1nF

C12

1nF

C5 OPT

C6 1nF

R12 OPT

1. ALL CAPACITORS AND RESISTORS ARE 0402.

NOTE:UNLESS OTHERWISE SPECIFIED,

0603

R10

L1 0

R4 OPT

C22 1nF

OPT

R3 1

C9 20pF

C3 20pF

VCC

C21 1nF

C25 1nF

C26 20pF

C18 20pF

L2 0

TP9

GND

R13 OPT C32 OPT

JP2 VCCN

VCC

R7 OPT

INB

1nF

VCC

C20

1nF

JP3 INV

VCC

TP3

VODF

TP2

VOA

C1 1nF

R6 1.10k

3.1V - 3.5V

R5 9.76k

TP5

VOB

R11

TP4

VOS

C4 1nF

LTC5583

Bill of Materials:

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1599A

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