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参数资料
| 型号： | MAT-03AH |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 小信号晶体管 |
| 英文描述： | 20 mA, 36 V, 2 CHANNEL, PNP, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| 文件页数： | 12/12页 |
| 文件大小： | 254K |
| 代理商： | MAT-03AH |
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
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| MAT-04NBCG | 30 mA, 40 V, 4 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR |
| MAT-04NACG | 30 mA, 40 V, 4 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR |
| MAT-04NAC | 30 mA, 40 V, 4 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAT03EH | 功能描述:IC TRANS DUAL MATCHED PNP TO78-6 RoHS:否 类别:分离式半导体产品 >> 晶体管(BJT) - 阵列 系列:- 标准包装:10,000 系列:- 晶体管类型:2 NPN（双） 电流 - 集电极 (Ic)（最大）:100mA 电压 - 集电极发射极击穿（最大）:45V Ib、Ic条件下的Vce饱和度（最大）:600mV @ 5mA，100mA 电流 - 集电极截止（最大）:- 在某 Ic、Vce 时的最小直流电流增益 (hFE):200 @ 2mA，5V 功率 - 最大:250mW 频率 - 转换:250MHz 安装类型:表面贴装 封装/外壳:6-TSSOP，SC-88，SOT-363 供应商设备封装:PG-SOT363-6 包装:带卷 (TR) 其它名称:SP000747402 |
| MAT03EHZ | 功能描述:IC TRANS DUAL MATCHED PNP TO78-6 RoHS:是 类别:分离式半导体产品 >> 晶体管(BJT) - 阵列 系列:- 标准包装:10,000 系列:- 晶体管类型:2 NPN（双） 电流 - 集电极 (Ic)（最大）:100mA 电压 - 集电极发射极击穿（最大）:45V Ib、Ic条件下的Vce饱和度（最大）:600mV @ 5mA，100mA 电流 - 集电极截止（最大）:- 在某 Ic、Vce 时的最小直流电流增益 (hFE):200 @ 2mA，5V 功率 - 最大:250mW 频率 - 转换:250MHz 安装类型:表面贴装 封装/外壳:6-TSSOP，SC-88，SOT-363 供应商设备封装:PG-SOT363-6 包装:带卷 (TR) 其它名称:SP000747402 |
| MAT03FH | 功能描述:IC TRANS DUAL MATCHED PNP TO78-6 RoHS:否 类别:分离式半导体产品 >> 晶体管(BJT) - 阵列 系列:- 标准包装:10,000 系列:- 晶体管类型:2 NPN（双） 电流 - 集电极 (Ic)（最大）:100mA 电压 - 集电极发射极击穿（最大）:45V Ib、Ic条件下的Vce饱和度（最大）:600mV @ 5mA，100mA 电流 - 集电极截止（最大）:- 在某 Ic、Vce 时的最小直流电流增益 (hFE):200 @ 2mA，5V 功率 - 最大:250mW 频率 - 转换:250MHz 安装类型:表面贴装 封装/外壳:6-TSSOP，SC-88，SOT-363 供应商设备封装:PG-SOT363-6 包装:带卷 (TR) 其它名称:SP000747402 |
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