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US 6,617,881 B2Granted
Semiconductor integrated circuit
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsHideki Uchiki, Harufusa Kondoh
Life of this patent
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Abstract
A driver circuit generates two control signals that change from low to high as an input signal changes from high to low, and change from high to low as the input signal changes from low to high. The driver circuit also generates another two control signals that change from high to low as the input signal changes from high to low, and change from low to high as the input signal changes from low to high. The driver circuit applies these four control signals to gate terminals of four MOS transistors. Timings of logical level changes of these four control signals are controlled so as to generate a period in which the four MOS transistors are simultaneously turned on or off.
Claims7
A semiconductor integrated circuit comprising:
- a first MOS transistor of a first conductivity type having a drain terminal connected to a first node;
- a second MOS transistor of a second conductivity type different from the first conductivity type, having a drain terminal connected to said first node;
- a third MOS transistor of the first conductivity type having a drain terminal connected to a second node and a source terminal connected to a source terminal of said first MOS transistor;
- a fourth MOS transistor of the second conductivity type having a drain terminal connected to said second node and a source terminal connected to a source terminal of said second MOS transistor;
- and
- a driver circuit which generates first to fourth control signals whose logical levels change in response to a common input signal, and applies the signals to respective gate terminals of said first to fourth MOS transistors, wherein
- the first control signal starts to change from a low level to a high level at a first time in response to a first level change of the input signal from a high level to a low level, and starts to change from the high level to the low level at a second time in response to a second level change of the input signal from the low level to the high level;
- the second control signal starts to change from a low level to a high level at a third time, that is later than the first time, in response to the first level change of the input signal, and starts to change from the high level to the low level at a fourth time, that is earlier than the second time, in response to the second level change of the input signal;
- the third control signal starts to change from a high level to a low level at a fifth time in response to the first level change of the input signal, and starts to change from the low level to the high level at a sixth time in response to the second level change of the input signal;
- the fourth control signal starts to change from a high level to a low level at a seventh time, that is earlier than the fifth time, in response to the first level change of the input signal, and starts to change from the low level to the high level at an eighth time, that is later than the sixth time, in response to the second level change of the input signal;
- and
- at least a portion of a period between the first and second times and at least a portion of a period between the fifth and sixth times overlap one another, and at least a portion of a period between the third and fourth times and at least a portion a period between the seventh and eighth times overlap one another.
9 more elements
A semiconductor integrated circuit comprising:
- a first MOS transistor of a first conductivity type having a drain terminal connected to a first node;
- a second MOS transistor of a second conductivity type different from said first conductivity type, having a drain terminal connected to said first node;
- a third MOS transistor of the first conductivity type having a drain terminal connected to a second node and a source terminal connected to a source terminal of said first MOS transistor;
- a fourth MOS transistor of the second conductivity type having a drain terminal connected to said second node and a source terminal connected to a source terminal of said second MOS transistor;
- and
- a driver circuit, which generates
- first and second control signals each of which changes from a low level to a high level in response to a first level change of an input signal from a high level to a low level, and changes from the high level to the low level in response to a second level change of the input signal from the low level to the high level, and
- third and fourth control signals each of which changes from a high level to a low level in response to the first level change of the input signal, and changes from the low level to the high level in response to the second level change of the input signal, and
- said driver circuit applies the first to fourth control signals to respective gate terminals of said first to fourth MOS transistors, wherein
- said driver circuit includes
- at least one first logic circuit consisting of a first delay circuit that is connected to a node whose voltage at its input changes in response to a voltage change of the input signal and delays the voltage change at the input to be output;
- and a NAND logic gate whose first input is connected to the input of said first delay circuit, and whose second input is connected to the output of said first delay circuit, and which outputs a NAND logic;
- and
- at least one second logic circuit consisting of a second delay circuit that is connected to a node whose voltage at its input changes in response to a voltage change of the input signal and delays the voltage change at the input to be output;
- and a NOR logic gate whose first input is connected to the input of said second delay circuit, and whose second input is connected to the output of said second delay circuit, and which outputs a NOR logic, wherein
- said driver circuit generates the first to fourth control signals based on the NAND logic output from at least one first logic circuit and the NOR logic output from at least one second logic circuit.
13 more elements
Dependencies are inferred from the claim text.