Adams & Wilks
Bias voltage generator circuit
A bias voltage generator circuit capable of keeping a constant electric current consumption (I0) and supplying bias voltages (V1, V2) respectively kept at constant values relative to its source voltage (VDD) and GND potential even when VDD 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 V1 and V2 are in a relation such that they control each other. Concretely, the V1 potential starting to rise causes the V2 potential to start to decrease, and the V1 potential starting to decrease causes the V2 potential to start to rise. The circuit has the property of making the circuit current fixed regardless of VDD. Even when VDD fluctuates, I0 is constant and V1 and V2 each produce a fixed potential.
Seiko NPC Corporation
G
G05F
inventional
Shinichi
Watanabe