| 摘要 |
<p>A reference circuit contains a PTAT (Proportional To Absolute Temperature) core. In the PTAT core there is a difference between the currents densities flowing through a first and second transistor. This difference results in a difference in junction voltage in the first and second transistor. The currents are adjusted by a local feedback loop in proportion to one another until the difference in junction voltage equals a voltage drop across a resistor. According to the invention the currents to both transistors are supplied by current sources, and the currents are adjusted by deviating a fraction of the supplied current from the transistors. This makes it possible to reference all control voltages for the transistors and the local feedback loop to the same supply connection, which increases the stability and power supply rejection of the circuit.</p> |
