Temperature dependent circuit, and current generating circuit, inverter and oscillation circuit using the same
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTsukasa Ooishi
Life of this patent
Estimating the term…
Abstract
Constant current is generated by a constant current generating circuit. This constant current is divided by a current dividing circuit, and current having temperature dependency is generated by a temperature dependent circuit based on the constant current. This current and the divided current are added in an adding circuit, and driving current is supplied to a ring oscillator. In the ring oscillator, one gate input of each of the odd number of stages of inverters is connected to an output of an inverter in the previous stage, and the other gate input thereof is connected to an output of an inverter in the second previous stage.
Claims26
A circuit for generating a current having temperature dependency, comprising:
- current dividing means for using constant current as it is or extracting current by dividing constant current into 1/n where n>1;
- temperature dependent current producing means for producing current having temperature dependency from said constant current;
- and
- adding means for adding current from said current dividing means and current having temperature dependency from said temperature dependent current producing means.
An inverter, comprising:
- inverter means having two gate inputs, wherein a first clock signal is applied to one gate input and a second clock signal is applied to another gate input;
- a first transistor of a first conductivity type connected between a first power supply line and a first power supply terminal of said inverter means for supplying current by a gate potential applied to an input electrode thereof;
- and
- a second transistor of a second conductivity type connected between a second power supply line and a second power supply terminal of said inverter means for supplying current by a gate potential applied to an input electrode thereof.
An oscillation circuit, comprising:
- a plurality of inverter means having two gate inputs, wherein a first clock signal is applied to one gate input and a second clock signal is applied to another gate input;
- a plurality of first transistors of a first conductivity type respectively connected between a first power supply line and respective first power supply terminals of said inverter means for supplying current by a gate potential applied to an input electrode thereof;
- and
- a plurality of second transistors of a second conductivity type respectively connected between a second power supply line and respective second power supply terminals of said inverter means for supplying current by a gate potential applied to an input electrode thereof.
A temperature dependent circuit, comprising:
- a current mirror circuit in which respective input electrodes of one transistor and another transistor are connected in common, current is supplied to a first electrode and said input electrode of said one transistor, and current is supplied to a first electrode of said another transistor;
- and
- resistive elements with different temperature characteristics respectively connected between a first power supply potential line and respective second electrodes of said one transistor and said another transistor of said current mirror circuit.
A current generating circuit, comprising:
- a current source for supplying constant current;
- a current mirror circuit including a first transistor having its first electrode receiving the constant current from said current source and a second transistor having its input electrode connected to an input electrode of said first transistor and having a first electrode from which current is extracted, and
- a resistive element connected between a second electrode of said second transistor and a reference potential.
A current generating circuit, comprising;
- a current source for supplying constant current;
- a diode-connected first transistor for receiving the constant current from said current source;
- a resistive element connected between an input electrode of said first transistor and a reference potential;
- and
- a second transistor having its input electrode connected to said input electrode of said first transistor for extracting current according to current flowing in said resistive element.
A current generating circuit, wherein
- a plurality of current generating circuits each including a current source for supplying constant current, a first transistor for receiving said constant current, a second transistor for outputting current, and a resistive element connected between said second transistor and a reference potential are cascade-connected to each other.
A current generating circuit, comprising:
- a first current mirror circuit constituted by transistors of a first conductivity type;
- a second current mirror circuit constituted by transistors of a second conductivity type and connected in series to said first current mirror circuit;
- and
- a plurality of diode-connected transistors of the first conductivity type connected in parallel to said first and said second current mirror circuits which are connected in series to each other.
Dependencies are inferred from the claim text.