发明名称 |
START-UP CIRCUIT AND METHOD FOR A SELF-BIASED ZERO-TEMPERATURE-COEFFICIENT CURRENT REFERENCE |
摘要 |
A current reference circuit is disclosed. A small startup current is defined as the base current into a bipolar transistor (45) with its collector-emitter path connected in series with a resistor between the power supply voltage and ground. This startup current is conducted via a diode-connected MOS transistor in a first leg of a current mirror. Temperature compensation is maintained by a reference leg in the current mirror that includes a bipolar transistor having an emitter area N times larger than that of a bipolar transistor in a second leg of the current mirror, to establish a temperature-compensated current in the reference leg. A compensation capacitor (32) connected between the collector and base of a bipolar transistor in the first leg suppresses oscillation, and can be modest in size due to the Miller effect.
|
申请公布号 |
WO2009039061(A3) |
申请公布日期 |
2009.05.14 |
申请号 |
WO2008US76388 |
申请日期 |
2008.09.15 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED;HELLUMS, JAMES, R. |
发明人 |
HELLUMS, JAMES, R. |
分类号 |
G05F3/26;G05F1/10 |
主分类号 |
G05F3/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|