BA6110FS

Standard ICs

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!

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!Measurement circuit

Fig.2

27k

Ω

10

µF

1k

Ω

1

2

1

3

1k

Ω

600

Ω

V

1

2

3

1V

1

2

5

7

9

1

2

150k

Ω

3

BA6110FS

11

12

14

15

D.V

mA

47k

Ω

1

2

1

2

BPF

V.V THD DV

40dB AMP

Vmp

+

30 ~ 20kHz

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!Circuit discription

The BA6110FS is configured of an operational amplifier

which can control the forward propagation conductance

compensating diode used to eliminate distortion created

by the amplifier’s differential input, a bias setter, and an

output buffer.

In the operational amplifier, Pin 1 is the positive input and

Pin 3 is the negative input. Pin 7 is the control pin which

determines the differential current. Pin 11 is the output pin

which determines the open loop gain using the external

resistor and the control current.

This section describes the circuit operation of this

operational amplifier.

composed of the current mirror circuits. The current

mirror absorbs current from the differential input common

emitter which is equal to the control current flowing into

collectors and the other half passes through the current

mirrors (3) and (4). The output of current mirror (3) which

is the differential active load is inverted by current mirror

(5), and is balanced with the output of current mirror (4),

also an active load.

If the differential input changes, the current balance

changes. The output current is on Pin 11. An output

voltage can be generated using an external resistance.

For the open loop gain of this operational amplifier, if the

2

KT

q

To eliminate the distortion created by the differential input,

the input bias diode and its bias circuit consist of the

(2), and the Pin 5 bias pin current mirror that consists of

This circuit eliminates the distortion that occurs as a

result of using the differential input open loop.

In the buffer circuit, Pin 12 is the buffer input and Pin 14 is

the buffer output.

In the buffer circuit, the emitter follower consists of the

eliminated by the emitter follower which consists of the

determined by the ratio of the signal source resistance