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參數(shù)資料
| 型號(hào)： | MAT02FHZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 小信號(hào)晶體管 |
| 英文描述： | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| 封裝： | METAL CAN-6 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 260K |
| 代理商： | MAT02FHZ |
OBSOLETE
MAT02
–10–
REV. E
Substituting in the voltage relationships and simplifying leads
to:
VO =
RO
R1
VY
V Z
V X
m
, where
(20)
m =
RB
+ KR
A
RB
+ 1– K
()R
A
The factor “K” is a potentiometer position and varies from zero
to 1.0, so “m” ranges from RB/(RA + RB) to (RB + RA)/RB.
Practical values are 125
for RB and 500 for RA; these
values will provide an adjustment range of 0.2 to 5.0. A value
of 100 k
is recommended for the R1 resistors assuming a full-
scale input range of 10 V. As with the one-quadrant
multiplier/divider circuit previously discussed, the VX, VY, and
VZ inputs must all be positive.
The op amps should have the lowest possible input offsets. The
OP07 is recommended for most applications, although such
programmable micropower op amps as the OP193/OP293 offer
advantages in low-power or single-supply circuits. The micro-
power op amps also have very low input bias-current drift, an
important advantage in log/antilog circuits. External offset
nulling may be needed, particularly for applications requiring a
wide dynamic range. Frequency compensating capacitors, on
the order of 50 pF, may be required for A2 and A3. Amplifier
A1 is likely to need a larger capacitor, typically 0.0047
F, to
assure stability.
Accuracy is limited at the higher input levels by bulk emitter
resistance, but this is much lower for the MAT02 than for other
transistor pairs. Accuracy at the lower signal levels primarily
depends on the op amp offsets. Accuracies of better than 1%
are readily achievable with this circuit configuration and can be
better than
±0.1% over a limited operating range.
FAST LOGARITHMIC AMPLIFIER
The circuit of Figure 7 is a modification of a standard logarith-
mic amplifier configuration. Running the MAT02 at 2.5 mA
per side (full-scale) allows a fast response with wide dynamic
range. The circuit has a 7 decade current range, a 5 decade
voltage range, and is capable of 2.5
s settling time to 1% with
a 1 V to 10 V step.
The output follows the equation:
VO =
R3
+ R
2
R2
kT
q
In
V REF
V IN
(21)
The output is inverted with respect to the input, and is nomi-
nally –1 V/decade using the component values indicated.
Figure 7. Fast Logarithmic Amplifier
LOW-NOISE
1000 AMPLIFIER
The MAT02 noise voltage is exceptionally low, only 1 nV/
√Hz
at 10 Hz when operated over a collector current range of 1 mA
to 4 mA. A single-ended
×1000 amplifier that takes advantage of
this low MAT02 noise level is shown in Figure 8. In addition to
low noise, the amplifier has very low drift and high CMRR. An
OP184 is used for the second stage to obtain good speed with
minimal power consumption. Small-signal bandwidth is 4.0
MHz, slew rate is 2.4 V/
s, and total supply current is approxi-
mately 2.25 mA.
Figure 8. Low-Noise, Single-Ended
× 1000 Amplifier
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAT02NBC | 制造商:Analog Devices 功能描述: |
| MAT03 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise, Matched Dual PNP Transistor |
| MAT03AH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MAT03AH/883C | 制造商:Rochester Electronics LLC 功能描述:HI-SPEED DUAL PNP TRANS-L - Bulk |
| MAT03ARC/883C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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