EL2082CS 데이터 시트보기 (PDF) - Elantec -> Intersil

부품명

상세내역

제조사

EL2082CS

Current-Mode Multiplier

Elantec -> Intersil 

EL2082C

Current-Mode Multiplier

Applications Information Contd

Using the VIN Pin

The VIN pin can be used instead of the IIN pin so

The VIN pin used

as signal input

 J Gm e IOUT e bVg

1

VIN

1v Rg a 95X

2082 – 17

This connection is useful when a high input impedance is required There are a few caveats when using

the VIN pin The first is that VIN has a 250 V ms slew rate limitation The second is that the inevitable

CSTRAY across Rg causes a gain zero and gain INCREASES above the 1 (2q CSTRAY Rg) frequency

and can peak as much as 20 dB with large CSTRAY A graph of gain vs frequency for several CSTRAYS

is included in the typical performance curves In general if wide bandwidth and frequency flatness is

desired the IIN pin should be used

The VIN pin does make an excellent ground reference pin for instance when low-frequency noise is to

be rejected The next schematic shows the EL2082 VIN pin rejecting possible 60 Hz hum induced on an

RF input cable

Using the VIN pin

as a ground reference

to reject hum and noise

2082 – 18

This example shows VIN rejecting low-frequency field-induced noise but not adding peaking since the

0 01 mF bypass capacitor shunts high-frequency signals to local ground

Reactive Couplings with the EL2082

The following sketch is an excerpt of a receiver IF amplifier showing methods of connecting the

EL2082 to reactive networks

Example Reactive

Couplings with EL2082’s

11

2082 – 19

Share Link: