High speed complementary field effect transistor logic circuits
DCFirst Claim
1. A field effect transistor (FET) logic circuit comprising:
- a driving stage including at least one FET of a first conductivity type, having at least one control electrode for receiving logic input signals, the at least one driving stage FET being connected between a common output and a first potential level;
a load FET of second conductivity type, connected between a second potential level and said common output; and
a complementary FET inverter comprising an FET of said first conductivity type and an FET of said second conductivity type, serially connected between said first and second potential levels, the output of said complementary inverter being connected to the control electrode of said load FET, the product of the carrier mobility and the ratio of channel width to length of the inverter FET of said first conductivity type being substantially greater than the product of the carrier mobility and the ratio of channel width to length of the inverter FET of said second conductivity type.
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Abstract
A high speed, high density, low power dissipation all parallel FET logic circuit includes a driving stage having a plurality of parallel FETs of a first conductivity type for receiving logic input signals and a load FET of second conductivity type connected to the common output of the driving stage. A complementary FET inverter including serially connected FETs of first and second conductivity type is connected to the common output and the load FET. According to the invention the voltage transfer function of the complementary inverter is skewed so that the product of the carrier mobility and the ratio of channel width to length of the inverter FET of the first conductivity type is made substantially greater than the product of the carrier mobility and the ratio of channel width to length of the inverter FET of the second conductivity type. By skewing the voltage transfer function of the complementary inverter the voltage lift-off interval is dramatically decreased, thereby improving the speed. AND and OR circuits and combined AND-OR circuits may be provided, having true and complement outputs. A multigate serial load transistor may further reduce power consumption.
29 Citations
20 Claims
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1. A field effect transistor (FET) logic circuit comprising:
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a driving stage including at least one FET of a first conductivity type, having at least one control electrode for receiving logic input signals, the at least one driving stage FET being connected between a common output and a first potential level; a load FET of second conductivity type, connected between a second potential level and said common output; and a complementary FET inverter comprising an FET of said first conductivity type and an FET of said second conductivity type, serially connected between said first and second potential levels, the output of said complementary inverter being connected to the control electrode of said load FET, the product of the carrier mobility and the ratio of channel width to length of the inverter FET of said first conductivity type being substantially greater than the product of the carrier mobility and the ratio of channel width to length of the inverter FET of said second conductivity type. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16, 17, 18, 19, 20)
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12. A field effect transistor (FET) logic circuit comprising:
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a driving stage including at least one FET of a first conductivity type, having at least one control electrode for receiving logic input signals, the at least one driving stage FET being connected between a common output and a first potential level; a load FET of second conductivity type, connected between a second potential level and said common output; a complementary FET inverter comprising an FET of said first conductivity type and an FET of said second conductivity type, serially connected between said first and second potential levels, the output of said complementary inverter being connected to the control electrode of said load FET, the product of the carrier mobility and the ratio of channel width to length of the inverter FET of said first conductivity type being substantially greater than the product of the carrier mobility and the ratio of channel width to length of the inverter FET of said second conductivity type; a second load FET of said conductivity type, connected between said second potential and said common output; and a second complementary FET inverter comprising an FET of said first conductivity type and an FET of said second conductivity type, serially connected between said first and second potential levels, the output of said second complementary FET inverter being connected to the control electrode of said second load FET. - View Dependent Claims (13, 14, 15)
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Specification