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參數(shù)資料
| 型號： | MAT03AH/883C |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 小信號晶體管 |
| 英文描述： | 20 mA, 36 V, 2 CHANNEL, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| 封裝： | METAL CAN-6 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大小： | 254K |
| 代理商： | MAT03AH/883C |
MAT03
–9–
REV. B
Q2 and Q3 are in series and operate at the same current levels so
the total output impedance is:
RO = hFE roQ3 @ (160)(1 M) = 160 M.
Figure 16. Cascode Current Source
CURRENT MATCHING
The objective of current source or mirror design is generation of
currents that are either matched or must maintain a constant ra-
tio. However, mismatch of base-emitter voltages cause output
current errors. Consider the example of Figure 17a. If the resis-
tors and transistors are equal and the collector voltages are the
same, the collector currents will match precisely. Investigating
the current-matching errors resulting from a nonzero VOS, we
define
I
C as the current error between the two transistors.
Graph 17b describes the relationship of current matching errors
versus offset voltage for a specified average current IC. Note that
since the relative error between the currents is exponentially pro-
portional to the offset voltage, tight matching is required to de-
sign high accuracy current sources. For example, if the offset
voltage is 5 mV at 100
A collector current, the current match-
ing error would be 20%. Additionally, temperature effects such
as offset drift (3
V/°C per mV of V
OS) will degrade performance
if Q1 and Q2 are not well matched.
DIGITALLY PROGRAMMABLE BIPOLAR CURRENT
PUMP
The circuit of Figure 18 is a digitally programmable current
pump. The current pump incorporates a DAC08, and a fast
Wilson current source using the MAT03. Examining Figure 18,
the DAC08 is set for 2 mA full-scale range so that bipolar cur-
rent operation of
±2 mA is achieved. The Wilson current mirror
maintains linearity within the LSB range of the 8-bit DAC08
(
±2 mA/256 = 15.6 A resolution) as seen in Figure 19. A
negative feedback path established by Q2 regulates the collector
current so that it matches the reference current programmed by
the DAC08.
Collector-emitter voltages across both Q1 and Q3 are matched
by D1, with Q3’s collector-emitter voltage remaining constant,
independent of the voltage across the current source output.
Since Q2 buffers Q3, both transistors in the MAT03, Q1 and Q3,
maintain the same collector current. D2 and D3 form a Baker
clamp which prevents Q2 from turning off, thereby improving
the switching speed of the current mirror. The feedback serves
to increase the output impedance and improves accuracy by re-
ducing the base-width modulation which occurs with varying
collector-emitter voltages. Accuracy and linearity performance
of the current pump is summarized in Figure 19.
Figure 17a. Current Matching Circuit
Figure 17b. Current Matching Accuracy %
vs. Offset Voltage
Figure 18. Digitally Programmable Bipolar Current Pump
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PDF描述 |
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| MAT-03AH | 20 mA, 36 V, 2 CHANNEL, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| MAT03AH/883 | 20 mA, 36 V, 2 CHANNEL, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| MAT-04NBC | 30 mA, 40 V, 4 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAT03ARC/883C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MAT03EH | 功能描述:IC TRANS DUAL MATCHED PNP TO78-6 RoHS:否 類別:分離式半導體產(chǎn)品 >> 晶體管(BJT) - 陣列 系列:- 標準包裝:10,000 系列:- 晶體管類型:2 NPN（雙） 電流 - 集電極 (Ic)（最大）:100mA 電壓 - 集電極發(fā)射極擊穿（最大）:45V Ib、Ic條件下的Vce飽和度（最大）:600mV @ 5mA，100mA 電流 - 集電極截止（最大）:- 在某 Ic、Vce 時的最小直流電流增益 (hFE):200 @ 2mA，5V 功率 - 最大:250mW 頻率 - 轉(zhuǎn)換:250MHz 安裝類型:表面貼裝 封裝/外殼:6-TSSOP，SC-88，SOT-363 供應商設備封裝:PG-SOT363-6 包裝:帶卷 (TR) 其它名稱:SP000747402 |
| MAT03EHZ | 功能描述:IC TRANS DUAL MATCHED PNP TO78-6 RoHS:是 類別:分離式半導體產(chǎn)品 >> 晶體管(BJT) - 陣列 系列:- 標準包裝:10,000 系列:- 晶體管類型:2 NPN（雙） 電流 - 集電極 (Ic)（最大）:100mA 電壓 - 集電極發(fā)射極擊穿（最大）:45V Ib、Ic條件下的Vce飽和度（最大）:600mV @ 5mA，100mA 電流 - 集電極截止（最大）:- 在某 Ic、Vce 時的最小直流電流增益 (hFE):200 @ 2mA，5V 功率 - 最大:250mW 頻率 - 轉(zhuǎn)換:250MHz 安裝類型:表面貼裝 封裝/外殼:6-TSSOP，SC-88，SOT-363 供應商設備封裝:PG-SOT363-6 包裝:帶卷 (TR) 其它名稱:SP000747402 |
| MAT03FH | 功能描述:IC TRANS DUAL MATCHED PNP TO78-6 RoHS:否 類別:分離式半導體產(chǎn)品 >> 晶體管(BJT) - 陣列 系列:- 標準包裝:10,000 系列:- 晶體管類型:2 NPN（雙） 電流 - 集電極 (Ic)（最大）:100mA 電壓 - 集電極發(fā)射極擊穿（最大）:45V Ib、Ic條件下的Vce飽和度（最大）:600mV @ 5mA，100mA 電流 - 集電極截止（最大）:- 在某 Ic、Vce 時的最小直流電流增益 (hFE):200 @ 2mA，5V 功率 - 最大:250mW 頻率 - 轉(zhuǎn)換:250MHz 安裝類型:表面貼裝 封裝/外殼:6-TSSOP，SC-88，SOT-363 供應商設備封裝:PG-SOT363-6 包裝:帶卷 (TR) 其它名稱:SP000747402 |
| MAT03FH | 制造商:Analog Devices 功能描述:SEMICONDUCTORSLINEAR |
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