| 摘要 |
<P>PROBLEM TO BE SOLVED: To generate a reference voltage which reduces power consumption, without using any large resistor. <P>SOLUTION: When a drain current of a P-channel transistor M3 is defined as I1 and a drain current of a P-channel transistor M4 is defined as I2, a relationship between a voltage VD1 which is generated in a junction D1 and a voltage VD2 which is generated in a junction D2 becomes VD1-VD2=(k×T/q)×In(10×I1/I2), thereby obtaining a voltage in proportion to an absolute temperature T. By loading negative feedback with N-channel transistor differential couples M6 and M7 and differential amplifiers which are active loads M1 and M2 of the P-channel transistors, a gate/back-gate voltage of a P-channel transistor M10 becomes equal with VD1-VD2. When currents of P-channel transistors M4 and M5 are set equal, gate/back-gate voltages of P-channel transistors M11-M20 become equal to that of the P-channel transistor M10, and Vout becomes a reference voltage of which the temperature coefficient is approximately zero. <P>COPYRIGHT: (C)2012,JPO&INPIT |
