9

LT1352/LT1353

Small-Signal Transient

Small-Signal Transient

Small-Signal Transient

1352/53 G33

1352/53 G32

1352/53 G31

Large-Signal Transient

Large-Signal Transient

Large-Signal Transient

1352/53 G36

1352/53 G35

1352/53 G34

Layout and Passive Components

The LT1352/LT1353 amplifiers are easy to use and toler-

ant of less than ideal layouts. For maximum performance

(for example, fast 0.01% settling) use a ground plane,

short lead lengths and RF-quality bypass capacitors (0.01

µF

to 0.1

µF). For high drive current applications use low ESR

bypass capacitors (1

µF to 10µF tantalum).

The parallel combination of the feedback resistor and

gain setting resistor on the inverting input can combine

with the input capacitance to form a pole which can cause

peaking or even oscillations. If feedback resistors greater

optimize dynamic performance. For applications where

the DC noise gain is one and a large feedback resistor is

example would be an I-to-V converter as shown in the

Typical Applications section.

Capacitive Loading

The LT1352/LT1353 are stable with any capacitive load.

As the capacitive load increases, both the bandwidth and

phase margin decrease so there will be peaking in the

frequency domain and in the transient response. Graphs

of Frequency Response vs Capacitive Load, Capacitive

Load Handling and the transient response photos clearly

show these effects.

Input Considerations

Each of the LT1352/LT1353 amplifier inputs is the base of

an NPN and PNP transistor whose base currents are of

opposite polarity and provide first order bias current

cancellation. Because of variation in the matching of NPN

and PNP beta, the polarity of the input current can be

positive or negative. The offset current does not depend on

NPN to PNP beta matching and is well controlled. The use

of balanced source resistance at each input is recom-