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.
Claims11
A circuit for generating a current having temperature dependency, comprising:
- current providing means for providing current based on generated constant current converted in accordance with a preset fixed ratio;
- temperature dependent current producing means for producing current having temperature dependency from said constant current;
- and
- adding means for adding current from said current providing means and current having temperature dependency from said temperature dependent current producing means.
A temperature dependent circuit for generating output current that varies in accordance with variation of temperature, 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, for generating the output current that increases with increase in temperature;
- wherein said output current is produced at an output of said another transistor, said resistive elements comprise a first resistive element associated with said one transistor, and a second resistive element associated with said another transistor, and temperature dependency of said second resistive element is greater than temperature dependency of said first resistive element.
A temperature dependent circuit for generating output current that varies in accordance with variation of temperature 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;
- 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, for generating the output current that varies in accordance with variation of temperature;
- reference potential generating means for generating a reference potential;
- and
- internal potential generating means responsive to an output of said current mirror circuit for generating an internal potential;
- wherein
- said resistive elements include a first transistor connected in series to said one transistor of said current mirror circuit and having an input electrode to which the reference potential is applied from said reference potential generating means, and a second transistor connected in series to said another transistor of said current mirror circuit and responsive to the internal potential from said internal potential generating means.
Dependencies are inferred from the claim text.