Level shift circuit and semiconductor integrated circuit
View Patent ↗A level conversion circuit is composed of a level shift circuit for supplying a level-converted signal in the same phase as the input signal and a signal in the reverse phase thereto and a follow-up circuit responsive to the earlier of the output signals of the level shift circuit for generating an output signal, wherein the follow-up circuit consists of an inverter circuit in which two p-channel type MOS transistors and two n-channel type MOS transistors are connected in series between a first voltage terminal and a second voltage terminal, of which one pair is used as input transistors and the remaining pair of transistors are subjected to feedback based on the output signal of the level shift circuit to be quickly responsive to the next variation.
1. A semiconductor integrated circuit comprising:
a level shift stage including:
a first input terminal to receive a first signal having a first amplitude;
a second input terminal to receive a second signal in a phase reverse to the first signal and having the first amplitude;
a first output terminal to supply a third signal having a second amplitude greater than the first amplitude and being in a phase reverse to the first signal;
a second output terminal to supply a fourth signal having the second amplitude and being in a phase reverse to the second signal;
a delay stage to receive the fourth signal and a fifth signal having the second amplitude and being in a phase reverse to the third signal and to output a delay signal of the fourth and fifth signals; and
an output stage including:
a first MOSFET of a first conductivity type to receive the fourth signal;
a second MOSFET of a second conductivity type to receive the fifth signal;
a third MOSFET of the first conductivity type to receive the delay signal, a drain of the third MOSFET being coupled to a source of the first MOSFET;
a fourth MOSFET of the second conductivity type to receive the delay signal, a drain of the fourth MOSFET being coupled to a source of the second MOSFET.
2. The semiconductor integrated circuit according to claim 1 , further comprising:
an output terminal being coupled to a drain of the first MOSFET and a drain of the second MOSFET.
3. The semiconductor integrated circuit according to claim 1 , further comprising:
a first inverter coupled to the second terminal, to receive the first signal and to output the second signal; and
a second inverter coupled to the first output terminal and the delay stage, to receive the third signal from the first output terminal and to output the fifth signal to the delay stage.
4. The semiconductor integrated circuit according to claim 1 , further comprising:
a fifth MOSFET of a first conductivity type, a source of the fifth MOSFET coupled to a source of the third MOSFET, a drain of the fifth MOSFET coupled to the drain of the third MOSFET; and
a sixth MOSFET of a second conductivity type, a source of the sixth MOSFET coupled to a source of the fourth MOSFET, a drain of the sixth MOSFET coupled to the drain of the fourth MOSFET;
wherein a gate width of the third MOSFET is wider than a gate width of the fifth MOSFET, and
wherein a gate width of the fourth MOSFET is wider than a gate width of the sixth MOSFET.