Semiconductor device including voltage conversion circuit having temperature dependency
AssigneeRenesas Technology Corp.
InventorTakashi Kono
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Abstract
A semiconductor device according to the present invention has a configuration that a resistance section is connected to only one of a current-mirror section forming a voltage conversion circuit and an output section. With this configuration, it is possible to determine the temperature dependency of an output voltage according to S factors of transistors forming one of the current-mirror section and the output section and a resistance value of the resistance section, and to suppress manufacturing irregularities caused by irregularities of the transistors between the two sections and those among a plurality of resistance materials.
Claims20
A semiconductor device comprising a voltage conversion circuit for converting a voltage value of an input voltage according to temperature change and outputting an output voltage, wherein
- said voltage conversion circuit includes:
- an input section having a first transistor connected between a first voltage line and a first node, and carrying an input current by applying said input voltage to said first transistor;
- a current-mirror section having a second transistor connected between said first node and a second voltage line supplying a different voltage from a voltage supplied by said first voltage line, and a third transistor connected between a second node, to which an output current according to said input current is carried, and said second voltage line, and forming a current-mirror by said second and third transistors;
- an output section having a fourth transistor connected between said second node and said first voltage line, and outputting said output voltage according to said output current from said second node;
- and
- a resistance section connected only one of between said second voltage line and said second transistor and between said first voltage line and said fourth transistor, and provided only as a resistance element in said voltage conversion circuit.
A semiconductor device comprising a plurality of voltage conversion circuits each outputting an output voltage according to an input voltage, wherein
- each of said voltage conversion circuits includes:
- an input section connected to a first voltage line, receiving said input voltage, and carrying an input current;
- a current-mirror section connected to a second voltage line supplying a different voltage from a voltage supplied by said first voltage line, and supplying an output current according to said input current;
- an output section connected to said first voltage line, and outputting said output voltage according to said output current;
- and
- a resistance section connected one of between said current-mirror section and said second voltage line and between said output section and said first voltage line,
- said plurality of voltage conversion circuits are cascaded to each other to form a plurality of voltage conversion circuit stages, and
- circuits elements forming said voltage conversion circuits are equal in connection relationship among the stages and said output voltage of each voltage conversion circuit stage rise or fall according to temperature rise.
Dependencies are inferred from the claim text.