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OP275 Folha de dados(PDF) 9 Page - Analog Devices

Nome de Peças OP275
Descrição Electrónicos  Dual Bipolar/JFET, Audio Operational Amplifier
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

OP275 Folha de dados(HTML) 9 Page - Analog Devices

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OP275
–8–
OP275
–9–
+15V
+
0.1F
2
3
8
1
4
VIN
VOUT
RL
2k
–15V
10F
0.1F
1/2
OP275
10F
+
+
Figure 12. Unity Gain Follower
0.1F
+15V
+
10F
2
3
8
1
4
VIN
VOUT
2k
–15V
10F
0.1F
10pF
4.99k
2.49k
4.99k
+
1/2
OP275
+
Figure 13. Unity Gain Inverter
In inverting and noninverting applications, the feedback resis-
tance forms a pole with the source resistance and capacitance
(RS and CS) and the OP275’s input capacitance (CIN), as shown
in Figure 14. With RS and RF in the kilohm range, this pole
can create excess phase shift and even oscillation. A small
capacitor, CFB, in parallel and RFB eliminates this problem.
By setting RS (CS + CIN) = RFBCFB, the effect of the feedback
pole is completely removed.
16V–20V
0.1F
V+
5V
RL
1k
D1
D2
+15V
2N4416
1k
D3
D4
OUTPUT
(TO SCOPE)
1F
10k
IC2
RF
2k
750
2N2222A
15k
–15V
1N4148
DUT
1/2 OP260AJ
16V–20V
0.1F
10k
+
+
SCHOTTKY DIODES D1–D4 ARE
HEWLETT-PACKARD HP5082-2835
IC1 IS 1/2 OP260AJ
IC2 IS PMI OP41EJ
V–
RG
222
+
Figure 11. OP275’s SettlingTimeTest Fixture
RFB
CIN
RS
CS
CFB
VOUT
+
Figure 14. Compensating the Feedback Pole
Attention to Source Impedances Minimizes Distortion
Since the OP275 is a very low distortion amplifier, careful atten-
tion should be given to source impedances seen by both inputs.
As with many FET-type amplifiers, the p-channel JFETs in the
OP275’s input stage exhibit a gate-to-source capacitance that var-
ies with the applied input voltage. In an inverting configuration,
the inverting input is held at a virtual ground and, as such, does
not vary with input voltage.Thus, since the gate-to-source voltage
is constant, there is no distortion due to input capacitance modu-
lation. In noninverting applications, however, the gate-to-source
voltage is not constant.The resulting capacitance modulation
can cause distortion above 1 kHz if the input impedance is
greater than 2 kand unbalanced.
OP275
VIN
VOUT
RF
RG
RS*
*
RS = RG//RF IF RG//RF > 2k
FOR MINIMUM DISTORTION
+
Figure 15. Balanced Input Impedance to Minimize
Distortion in Noninverting Amplifier Circuits
Figure 15 shows some guidelines for maximizing the distortion
performance of the OP275 in noninverting applications.The best
way to prevent unwanted distortion is to ensure that the parallel
combination of the feedback and gain setting resistors (RF and
RG) is less than 2 k. Keeping the values of these resistors small
has the added benefits of reducing the thermal noise of the circuit
REV. C
REV. C


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