LM13700N datasheet(9/37 Pages) TI1

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LM13700

www.ti.com

SNOSBW2F – NOVEMBER 1999 – REVISED NOVEMBER 2015

7 Detailed Description

7.1 Overview

The LM13700 is a two channel current controlled differential input transconductance amplifier with additional

output buffers. The inputs include linearizing diodes to reduce distortion, and the output current is controlled by a

dedicated pin. The outputs can sustain a continuous short to ground.

7.2 Functional Block Diagram

Figure 16. One Operational Transconductance Amplifier

7.3 Feature Description

7.3.1 Circuit Description

The differential transistor pair Q4 and Q5 form a transconductance stage in that the ratio of their collector currents

is defined by the differential input voltage according to the transfer function:

(1)

where VIN is the differential input voltage, kT/q is approximately 26 mV at 25°C and I5 and I4 are the collector

currents of transistors Q5 and Q4 respectively. With the exception of Q12 and Q13, all transistors and diodes are

identical in size. Transistors Q1 and Q2 with Diode D1 form a current mirror which forces the sum of currents I4

and I5 to equal IABC:

I4 + I5 = IABC

(2)

where IABC is the amplifier bias current applied to the gain pin.

For small differential input voltages the ratio of I4 and I5 approaches unity and the Taylor series of the In function

is approximated as:

(3)

(4)

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Số phần tương tự - LM13700N

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