| 摘要 |
A bias voltage generator circuit capable of keeping a constant electric current consumption (I<SUB>0</SUB>) and supplying bias voltages (V<SUB>1</SUB>, V<SUB>2</SUB>) respectively kept at constant values relative to its source voltage (V<SUB>DD</SUB>) and GND potential even when V<SUB>DD </SUB>fluctuates. The circuit includes: three p-channel transistors connected in a current mirror, each having a source connected to source voltage; and four n-channel transistors, each having a source connected to GND. Bias voltages V<SUB>1 </SUB>and V<SUB>2 </SUB>are in a relation such that they control each other. Concretely, the V<SUB>1 </SUB>potential starting to rise causes the V<SUB>2 </SUB>potential to start to decrease, and the V<SUB>1 </SUB>potential starting to decrease causes the V<SUB>2 </SUB>potential to start to rise. The circuit has the property of making the circuit current fixed regardless of V<SUB>DD</SUB>. Even when V<SUB>DD </SUB>fluctuates, I<SUB>0 </SUB>is constant and V<SUB>1 </SUB>and V<SUB>2 </SUB>each produce a fixed potential.
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