TS615IPWT(2004) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TS615IPWT
(Rev.:2004)

Dual Wide-Band Operational Amplifier with High Output Current

STMicroelectronics 

TS615

Increasing the Line Level Using Active Impedance Matching

11 Increasing the Line Level Using Active Impedance Matching

With passive matching, the output signal amplitude of the driver must be twice the amplitude on the load.

To go beyond this limitation an active matching impedance can be used. With this technique, it is possible

to maintain good impedance matching with an amplitude on the load higher than half of the output driver

amplitude. This concept is shown in Figure 73 for a differential line.

Figure 73. TS615 as a differential line driver with active impedance matching

100n

Vcc+

1k

Vi

+ Vcc+

_

GND

R2

1/2 R1 R3

Vcc/2

1/2 R1 R5

Vi

10µ

100n

1k

GND

R4

+ Vcc+

100n

_

GND

Rs1

Vo°

Vo°

Rs2

1µ

10n

Vo

RL

1:n

Hybrid

& 100Ω

Transformer

Vo

Component calculation

Let us consider the equivalent circuit for a single-ended configuration, as shown in Figure 74.

Figure 74. Single-ended equivalent circuit

+

Vi

_

1/2R1

R2

R3

Rs1

Vo°

-1

Vo

1/2RL

32/36

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