DA-0520S41NA datasheet(4/4 Pages) AAC

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Detector Log Video Amplifiers (DLVA)

The content of this specification may change without notification7/01/09

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DLVA

Outline Drawings (Size: mm)

Terms and Definitions

Operational Bandwidth is the range of input

frequency

over which

the technical

speci-

fications of the amplifier are met.

Log Slope is the straight line slope of the

input/output

transfer

characteristics

of the

detected signal over the dynamic range. The

log slope is expressed in millivolts per dB of a

best-fit straight line as derived by a least-

squares

approximation

of all

data

points

Log Linearity is the maximum deviation in dB

of all measured points from the calculated

best-fit straight line. The dynamic range can

high

75dB,

depending

upon

DL1

DL3

Dynamic Range is the range of the input

signals in dB over which the output linearity

requirement is met.

Maximum

Input

Power

is the

maximum

power

that

the

logarithmic

amplifier

can

withstand without damage.

DC offset

is the residual

DC output

of a

logarithmic

amplifier

when

the

input

terminated with 50ohm.

Tangential Signal Sensitivity (TSS) defines

the input level that results in an output signal-

to-noise ratio of 6 dB. TSS, which is directly

related to noise figure and bandwidth, aids in

defining the lower limit of the input dynamic

range of a logarithmic amplifier. TSS is also a

convenient way of specifying a logarithmic

amplifier's

noise performance,

since

noise

Rise Time is defined as the time difference

between the 10% point and 90% point on the

rising leading edge of the output video pulse.

Recovery Time for a logarithmic amplifier is

defined in many ways by system engineers.

The most common is to use multiple pulses

and characterize the time between the 90%

point on the trailing edge of the first pulse and

the 10% point on the leading edge of the

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