| 摘要 |
<p>A bandgap reference circuit (100) for generating a reference voltage (Vref) includes a transistor (Q1), a bias current (Ibias) source for generating a bias current, a proportianal to absolute temperature (PTAT) current source (IPTAT) for generating a PTAT current, a first resistor (R1), and a second resistor (R2). The transistor (Q2) generates a base-emitter voltage that is divided at an output node through the first (R1) and second resistors (R2). The first resistor (R2) couples between the collector of the transistor (Q1) and the output node. The second resistor (R2) couples between the output node and ground (103). The bias current source (Ibias) supplies the bias current to the transistor (Q1) and the PTAT current source (IPTAT) supplies a PTAT current to output node 105. The reference voltage (Vref) may be obtained at output node as a result of combining a portion of the base-emitter voltage, which has a negative temperature coefficient, with a PTAT voltage that is obtained by sensing a portion of the PTAT current over the second resistor.</p> |
