TRAC020LHQ36 データシートの表示（PDF） - Zetex => Diodes

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TRAC020LHQ36

TOTALLY RE-CONFIGURABLE ANALOG CIRCUIT - TRAC®

Zetex => Diodes 

TRAC020LH

CELL FUNCTION DETAILS

ADD (code 011)

Can be represented as an operational

amplifier with three resistors of equal value R.

The virtual earth at the inverting input gives:-

Eo = -R(Ea/R + Eb/R) = - (Ea + Eb)

The output is the inverted sum of the input

voltages.

NEGATE (code 010)

The negate function is provided by an adder,

but with only one input, therefore Eo=-Eb

NON INVERTING PASS (code 100)

Used for topological reasons. It provides a

route through the cell with no modification. i.e.

a unity gain amplifier

LOG (code 110)

Can be represented as an operational

amplifier with a pair of back to back diodes in

the negative feedback loop and an input

resistor R. The virtual earth at the inverting

input gives:-

Eo = -kT/q log (Ea/RIo + 1)

where

k = Boltzmann’s constant

T = absolute temperature

q = electron charge

Io=saturation current

ANTI - LOG (code 101)

Similar to the log circuit except that the diodes

and resistors are reversed. The output voltage

is therfore given as :-

Eo = -RIo (exp qEa/KT - 1)

When the signal is processed through both log

and anti-log the magnitude of the saturation

current and absolute temperature cancel.

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