LT1256CS datasheet(12/24 Pages) LINER

12 / 24 page

LT1251/LT1256

APPLICATIONS INFORMATION

Figure 2 is the basic block diagram of the LT1251/LT1256

signal path with external resistors RG1, RF1, RG2 and RF2.

Both input stages are operating as noninverting amplifiers

with two input signals V1 and V2.

Each input stage has a unity-gain buffer from the nonin-

verting input to the inverting input. Therefore, the inverting

input is at the same voltage as the noninverting input. R1

and R2 represent the internal output resistances of these

buffers, approximately 27

Ω.

K is a constant determined by the control circuit and can

be any value between 0 and 1. The control circuit is

described in a later section.

By inspection of the diagram:

+ ()( )

−









Substituting and rearranging gives:

IKI

K I

sR C

+ ()(

)

−









=+ −

()













General Equation for the Noninverting Amplifier Case

sR C

+ ()( )

−

()

+ ()(

)









−

()









–

1251/56 BD

1 – K

RG2

RG1

ROL

RF1

RF2

–

Figure 2. Signal Path Block Diagram

Signal Path Description

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