LT5537 Ver la hoja de datos (PDF) - Linear Technology

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LT5537

Wide Dynamic Range RF/IF Log Detector

Linear Technology 

APPLICATIO S I FOR ATIO

AGILENT

E4436B

SIGNAL

GENERATOR

RF OUT

J1

J2 POWER J3

DIVIDER

–30dB

ATTENUATOR

–30dB

ATTENUATOR

J1

J2 POWER J3

DIVIDER

RF1 MINICIRCUIT

SPDT

ZYSW-2-50DR RF IN

RF2

TTL

50Ω

OUT

HP33120A

FUNCTION

GENERATOR

SYNC

INPUT

LT5537

DEMO

BOARD

OUTPUT

PM8943A

FET PROBE

10:1

CH3

CH4

–6dB

TRIG

ATTENUATOR

HP 83480A

DIGITAL COMMUNICATIONS

ANALYZER WITH

HP 54751A

ELECTRONIC PLUG-IN

5537 F14

Figure 8. Timing Test Setup

LT5537

Baseband Response

The unloaded bandwidth of the LT5537 output buffer is

10MHz. With 2.5pF loading, the output bandwidth is

approximately 6MHz. The baseband response of the LT5537

was characterized with a pulsed RF input using the setup

shown in Figure 8. The input to the LT5537 is a 200MHz

CW RF signal switched between –30dBm and –60dBm at

a rate of 600kHz. The output was connected to a FET probe

(Fluke PM8943A, 10:1 tip) which has a capacitive loading

of 2.5pF. The 10% to 90% rise and fall times are 109ns and

115ns, respectively. The input signal and output response

are shown in Figure 9.

Figure 9. Response Time (–30dBm to –60dBm)

5537fa

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