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參數資料
| 型號： | 6204I |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Rail-to-Rail Input and Output, Ultralow 1.9n Root Hz Noise, Low Power Op Amps |
| 中文描述： | 軌到軌輸入和輸出，超低1.9n根赫茲噪聲，低功耗運算放大器 |
| 文件頁數： | 17/24頁 |
| 文件大小： | 587K |
| 代理商： | 6204I |
LT6202/LT6203/LT6204
17
620234fa
Low Noise, Low Power 1M
AC
Photodiode Transimpedance Amplifier
Figure 3 shows the LT6202 applied as a transimpedance
amplifier (TIA). The LT6202 forces the BF862 ultralow-
noise JFET source to 0V, with R3 ensuring that the JFET
has an I
DRAIN
of 1mA. The JFET acts as a source follower,
buffering the input of the LT6202 and making it suitable for
the high impedance feedback elements R1 and R2. The
BF862 has a minimum I
DSS
of 10mA and a pinchoff voltage
between –0.3V and –1.2V. The JFET gate and the LT6202
Figure 3. Low Noise, Low Power 1M
AC Photodiode Transimpedance Amplifier
Figure 4. Precision Low Noise, Low Power Transimpedance Amplifier
output therefore sit at a point slightly higher than one
pinchoff voltage below ground (typically about –0.6V).
When the photodiode is illuminated, the current must
come from the LT6202’s output through R1 and R2, as in
a normal TIA. Amplifier input noise density and gain-
bandwidth product were measured at 2.4nV/Hz and
100MHz, respectively. Note that because the JFET has a
high g
m
, approximately 1/80
, its attenuation looking into
R3 is only about 2%. Gain-bandwidth product was mea-
sured at 100MHz and the closed-loop bandwidth using a
3pF photodiode was approximately 1.4MHz.
Precision Low Noise, Low Power, 1M
Photodiode Transimpedance Amplifier
Figure 4 shows the LT6202 applied as a transimpedance
amplifier (TIA), very similar to that shown in Figure 3. In
this case, however, the JFET is not allowed to dictate the
DC-bias conditions. Rather than being grounded, the
LT6202’s noninverting input is driven by the LTC2050 to
the exact state necessary for zero JFET gate voltage. The
noise performance is nearly identical to that of the circuit
in Figure 3, with the additional benefit of excellent DC
performance. Input offset was measured at under 200
μ
V
and output noise was within 2mV
P-P
over a 20MHz
bandwidth.
–
+
V
BIAS–
PHILIPS
BF862
R1
499k
R2
499k
C1
1pF
V
S–
V
S+
V
OUT
V
S
=
±
5V
LT6202
R3
4.99k
LT6202/03/04 F03
–
LTC2050HV
+
V
BIAS–
PHILIPS
BF862
R1
499k
R2
499k
C1
1pF
V
S–
V
S+
V
OUT
V
S
=
±
5V
R3
4.99k
C2
0.1
μ
F
R4
10M
R5
10k
C3
1
μ
F
LT6202/03/04 F04
–
+
LT6202
TYPICAL APPLICATIO S
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