Semiconductor integrated circuit device with low power consumption in a standby mode using an on-chip substrate bias generator
First Claim
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1. A semiconductor integrated circuit device comprising:
- a semiconductor logic circuit operable both in active and standby modes; and
on-chip substrate bias generating means, including an input terminal responsive to a mode control signal having first and second signal levels respectively corresponding to said active and standby modes, for providing a first on-chip substrate bias voltage to said semiconductor logic circuit in said active mode in response to said first signal level and a second on-chip substrate bias voltage of a different value in said standby mode in response to said second signal level, thereby reducing the power consumption of both said logic circuit and said substrate bias generating means during said standby mode.
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Abstract
A mode switching transistor which is controlled by a chip enable signal is connected between a power supply terminal and a MOS inverter including transistors. The transistor functions as a weak depletion or depletion type MOS transistor to provide sufficient current with a first back gate bias given in an active mode and functions as a perfect enhancement type transistor to completely cut off current with a second back gate bias given in a standby mode.
82 Citations
14 Claims
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1. A semiconductor integrated circuit device comprising:
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a semiconductor logic circuit operable both in active and standby modes; and on-chip substrate bias generating means, including an input terminal responsive to a mode control signal having first and second signal levels respectively corresponding to said active and standby modes, for providing a first on-chip substrate bias voltage to said semiconductor logic circuit in said active mode in response to said first signal level and a second on-chip substrate bias voltage of a different value in said standby mode in response to said second signal level, thereby reducing the power consumption of both said logic circuit and said substrate bias generating means during said standby mode. - View Dependent Claims (4, 5, 9)
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2. A semiconductor integrated circuit device comprising:
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a semiconductor logic circuit operable both in active and standby modes; and on-chip substrate bias generating means for providing a first on-chip substrate bias voltage to said semiconductor logic circuit in said active mode and a second on-chip bias voltage of a different value in said standby mode, wherein said on-chip substrate bias generating means includes a first generator for generating said first on-chip substrate bias voltage at the time of said active mode and a second generator for generating said second on-chip substrate bias voltage at the time of said standby mode. - View Dependent Claims (8, 10)
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3. A semiconductor integrated circuit device comprising:
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a semiconductor logic circuit operable both in active and standby modes, wherein said semiconductor logic circuit is a MOS inverter including a mode switching transistor having a gate for receiving a chip enable signal and a drain-source current path connected between a power supply terminal and a node, a load element connected between said node and an output terminal, and a transistor having a gate receiving an input signal and a drain-source current path connected between said output terminal and ground; and on-chip substrate bias generating means for providing a first on-chip substrate bias voltage to said semiconductor logic circuit in said active mode and a second on-chip substrate bias voltage of a different value in said standby mode. - View Dependent Claims (6, 7, 11, 12, 13)
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14. A semiconductor integrated circuit device comprising an integrated circuit including first and second MOS inverters each including a load resistor provided between a first voltage supply terminal and an output terminal and a drive element having its drain-source current path connected between a second voltage supply terminal and said output terminal, the output terminal of said first MOS inverter being connected to the gate electrode of the drive element in said second MOS inverter, the output terminal of said second MOS inverter being connected to the gate electrode of the drive element in said first MOS inverter, a transfer element being connected to the output terminal of each of said first and second MOS inverters for transferring an output signal therefrom, and bias voltage generating means for generating a first on-chip substrate bias voltage with respect to the semiconductor substrate of said integrated circuit in a first mode and a second on-chip substrate bias voltage in a second mode, whereby the current level in each of said load resistors is substantially unaffected by the on-chip substrate bias changing between said first voltage and said second voltage.
Specification