OPA615 datasheet(14/26 Pages) TI

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−

Single Transistor

V+

(a) Common Collector Amplifier

(Emitter Follower)

100

Ω

OTA

(b) Common−C Amplifier for OTA

(Buffer)

≈

0.7V

≈

O =

G =

≈ 1

1 +

m x RE

Inverting Gain

Single Transistor

(a) Common−Base

Amplifier

OTA

(b) Common−B Amplifier for OTA

Noninverting Gain

several volts

≈

G =

−

≈ −

E + g

OS ≈ 0

V+

100

Ω

OPA615

SBOS299B – FEBRUARY 2004 – REVISED JULY 2005

Figure 37 shows the Common-C amplifier. It consti-

Figure 38 shows the Common-B amplifier. This con-

tutes an open-loop buffer with low offset voltage. Its

figuration produces an inverting gain, and the input is

gain is approximately 1 and will vary with the load.

low-impedance. When a high impedance input is

needed, it can be created by inserting a buffer

amplifier (such as the BUF602) in series.

Figure 37. a) Common Collector Amplifier Using a

Discrete Transistor; b) Common-C Amplifier

Using the OTA Portion of the OPA615

Figure 38. a) Common Base Amplifier Using a

Discrete Transistor; b) Common-B Amplifier

Using the OTA Portion of the OPA615

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