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OPA660AP Datasheet(PDF) 10 Page - Texas Instruments

Part # OPA660AP
Description  OPERATIONAL TRANSCONDUCTANCE AMPLIFIER AND BUFFER
PDF  20 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA660AP Datasheet(HTML) 10 Page - Texas Instruments

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10
®
OPA660
R
B
R
L
R
B
R
E
V–
V+
V
I
V
O
(a) Common-Emitter Amplifier
V
O
100
Ω
OTA
V
I
B
E
R
L
R
E
Non-Inverting Gain
(b) Common-E Amplifier
Inverting Gain
V
several volts
OS ≈
3
2
C
8
Transconductance varies over temperature.
Transconductance remains constant over temperature.
V
OS ≈ 0
V–
V+
V
I
V
O
(a) Common-Collector Amplifier
(Emitter Follower)
V
O
100
Ω
OTA
V
I
(b) Common-C Amplifier
(Buffer)
≈
OS
G
1
V
0.7V
≈
≈
OS
G
1
V
0
≈
B
3
C
8
R
E
R
E
R
O =
1
g
m
G =
≈ 1
1 +
1
g
m ¥ RE
1
E
2
using this more complex biasing circuitry. It does, however,
demonstrate the possibility of signal-controlled quiescent
current. This may suggest other possibilities such as AGC,
dynamic control of AC behavior, or VCO.
Figure 4 shows logic control of pin 1 used to disable the
OPA660. Zero/5V logic levels are converted to a 1mA/0mA
current connected to pin 1. The 1mA current flowing in RQ
increases the voltage at pin 1 to approximately 1V above the
–5V rail. This will reduce IQ to near zero, disabling the
OPA660.
BASIC APPLICATIONS CIRCUITS
Most applications circuits for the OTA section consist of a
few basic types which are best understood by analogy to a
transistor. Just as the transistor has three basic operating
modes—common emitter, common base, and common col-
lector—the OTA has three equivalent operating modes com-
mon-E, common-B, and common-C. See Figures 5, 6, and 7.
50k
Ω
100
Ω
14
–5V
I
C
250
Ω
R
Q
Internal
Current Source
Circuitry
≈
OPA660
2N2907
+5V
I = 0: OPA660 On
I
1mA: OPA660 Off
C
C
0/5V
Logic In
5V: OPA660 On
4.7k
Ω
FIGURE 7. Common-Base vs Common-B Amplifier.
FIGURE 6. Common-Collector vs Common-C Amplifier.
FIGURE 5. Common-Emitter vs Common-E Amplifier.
FIGURE 4. Logic-Controlled Disable Circuit.
Inverting Gain
V
I
V
O
(a) Common-Base
Amplifier
OTA
V
I
(b) Common-B Amplifier
OS
R
L
Non-Inverting Gain
V
several volts
R
E
V
O
R
L
R
E
≈
B
E
3
2
C
8
G = –
≈ –
R
L
R
E + g
m
1
R
L
R
E
V
OS ≈ 0
V+
100
Ω



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