Linear 747 Manual de usuario

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 747

LOG-LINEAR RF/IF DETECTOR

LT5537

DESCRIPTION

Demonstration circuit 747 is a

log-linear RF/IF detector

featuring the LT

5537.

The LT5537 is a wide dynamic range RF/IF log detec-

tor, operational from below 10MHz to 1000MHz. The

lower limit of the operating frequency range can be

extended to near DC by the use of an external capaci-

tor. The input dynamic range at 200MHz with ±3dB

nonlinearity is 90dB (from –76dBm to 14dBm, single-

ended 50Ωinput). The detector output voltage slope

is normally 20mV/dB, and the typical temperature

coefficient is 0.01dB/°C at 200MHz.

Design files for this circuit board are available. Call

the LTC factory.

LTC is a trademark of Linear Technology Corporation

Table 1.

Typical Performance Summary (VCC = 3V, ENBL = 3V, TA= 25°C, unless otherwise noted. Test circuit shown in Figure 1.)

PARAMETER CONDITION VALUE

Supply Voltage 2.7V to 5.25V

Supply Current 13.5mA

Shutdown Current ENBL = Low 500µA

ENBL Voltage Low, Chip Disabled

High, Chip Enabled

0.3V max

1.0V min

ENBL Input Current V

ENBL

= 0V

ENBL

= 3V

0µA

100µA

RF/IF Input DC Common Mode Voltage (V

– 0.4) V

Small-Signal Impedance

Measured at 200MHz 1.73kΩ// 1.45pF

Output Start Voltage No Input Signal Present 0.4V

Response Time Input from –30dBm to 0dBm, C

LOAD

= 2.5pF 110ns

Baseband Modulation Bandwidth Output Load Capacitance = 2.5pF 6MHz

Input Frequency Range Operation at lower frequency is possible. See LT5537 datasheet. 10MHz to 1GHz

Maximum Input Power for

Monotonic Output

50ΩTermination

200MHz

600MHz

1GHz

14.0dBm

11.6dBm

9.4dBm

f = 10MHz

Linear Dynamic Range ±3dB Error

±1dB Error

88.8dB

72.5dB

Slope R1 = 33k (The output slope is adjustable using R1.) 19.6mV/dB

Intercept V

OUT

= 0V, extrapolated -97dBm

Sensitivity Sensitivity can be improved by as much as 10dB by using a narrow-

band input matching network. See LT5537 datasheet. -76.7dBm

Temperature Coefficient P

= -20dBm -0.007dB/°C

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 747

LOG-LINEAR RF/IF DETECTOR

f = 100MHz

Linear Dynamic Range ±3dB Error

±1dB Error

90.5dB

82.8dB

Slope R1 = 33k (The output slope is adjustable using R1.) 20.3mV/dB

Intercept V

OUT

= 0V, extrapolated -95dBm

Sensitivity Sensitivity can be improved by as much as 10dB by using a narrow-

band input matching network. See LT5537 datasheet. -77dBm

Temperature Coefficient P

= -20dBm -0.004dB/°C

f = 200MHz

Linear Dynamic Range ±3dB Error

±1dB Error

90.3dB

83.5dB

Slope R1 = 33k (The output slope is adjustable using R1.) 21.2mV/dB

Intercept V

OUT

= 0V, extrapolated -94dBm

Sensitivity Sensitivity can be improved by as much as 10dB by using a narrow-

band input matching network. See LT5537 datasheet. -76.4dBm

Temperature Coefficient P

= -20dBm 0.010dB/°C

f = 400MHz

Linear Dynamic Range ±3dB Error

±1dB Error

88.2dB

70.8dB

Slope R1 = 33k (The output slope is adjustable using R1.) 23.1mV/dB

Intercept V

OUT

= 0V, extrapolated -91dBm

Sensitivity Sensitivity can be improved by as much as 10dB by using a narrow-

band input matching network. See LT5537 datasheet. -75.3dBm

Temperature Coefficient P

= -20dBm 0.019dB/°C

f = 600MHz

Linear Dynamic Range ±3dB Error

±1dB Error

85.8dB

72.5dB

Slope R1 = 33k (The output slope is adjustable using R1.) 25.2mV/dB

Intercept V

OUT

= 0V, extrapolated -89dBm

Sensitivity Sensitivity can be improved by as much as 10dB by using a narrow-

band input matching network. See LT5537 datasheet. -74.1dBm

Temperature Coefficient P

= -20dBm 0.026dB/°C

f = 1GHz

Linear Dynamic Range ±3dB Error

±1dB Error

63.5dB

51.7dB

Slope R1 = 33k (The output slope is adjustable using R1.) 31.4mV/dB

Intercept V

OUT

= 0V, extrapolated -80dBm

Sensitivity Sensitivity can be improved by as much as 10dB by using a narrow-

band input matching network. See LT5537 datasheet. -69.2dBm

Temperature Coefficient P

= -20dBm 0.031dB/°C

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 747

LOG-LINEAR RF/IF DETECTOR

QUICK START PROCEDURE

Demonstration circuit 747 is easy to set up to evalu-

ate the performance of the LT5537. Refer to Figure 1

for proper measurement equipment setup and follow

the procedure below:

Connect voltmeter’s negative (-) lead to demo

board GND test point (E4 or E5).

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

board OUTPUT test point (E2).

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

demo board GND test point (E4 or E5).

Connect DC power supply’s positive (+) output

(2.7V to 5.25V) to demo board V

test point (E3).

NOTE:

Do not exceed 5.5V, the absolute maximum

supply voltage.

Connect signal generator’s output to demo board

INPUT port (SMA connector J1) via coaxial cable.

A 3dB attenuator may be inserted to improve input

match.

Using a jumper cable, connect demo board V

test

point (E3) to ENBL test point (E1). Now the detec-

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

NOTE:

Make sure that the power is not applied to

ENBL before it is applied to V

. The voltages on

the ENBL test point must never exceed V

+ 0.2V.

Apply RF input signal and measure OUTPUT DC

voltages.

NOTE:

Do not exceed +22dBm, the absolute maxi-

mum RF input power.

Figure 1.

Proper Measurement Equipment Setup

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 747

LOG-LINEAR RF/IF DETECTOR

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