Patent ID: 11967949
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A bias circuit comprising:
a current mirror circuit to include first conductivity type first and second transistors connected between a first power supply node that supplies a first voltage and first and second nodes;
a current generation circuit to include a second conductivity type transistor connected between a second power supply node that supplies a second voltage and the first and second nodes; and
a starting control circuit to detect, during the starting of the bias circuit, a transition from a first state continuing from before starting to a second state accompanied by the starting, wherein
control electrodes of the first and second transistors connected to each other are electrically connected to one node that is one of the first and second nodes at least in the second state,
the bias circuit further comprises a starting circuit to switch a connection destination of the control electrodes between the first state and the second state during the starting of the bias circuit,
the starting circuit includes
a first switch connected between a first voltage node that supplies an off-voltage to turn off the first and second transistors and the control electrodes,
a second switch connected between a third node and the control electrodes, and
a third switch connected between a second voltage node that supplies an on-voltage to turn on the first and second transistors and the third node,
the second switch is turned off in the first state and turned on in the second state, and
the first switch and the third switch are turned on in the first state and turned off in the second state.