Transistors providing desired threshold voltage and reduced short channel effects with forward body bias
First Claim
1. A semiconductor circuit, comprising:
- a first group of field effect transistors having a body and parameters including a net channel doping level DL1; and
a conductor to provide a first voltage to the body to forward body bias the first group of transistors, the first group of transistors having a forward body bias threshold voltage (VtFBB) when forward body biased, wherein DL1 is at least 25% higher than a net channel doping level in the first group of transistors that would result in a zero body bias threshold voltage equal to VtFBB, with the parameters other than the net channel doping level being unchanged.
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Accused Products
Abstract
In one embodiment, a semiconductor circuit includes a first group of field effect transistors having a body and parameters including a net channel doping level DL1. The circuit also includes a conductor to provide a first voltage to the body to forward body bias the first group of transistors, the first group of transistors having a forward body bias threshold voltage (VtFBB) when forward body biased, wherein DL1 is at least 25% higher than a net channel doping level in the first group of transistors that would result in a zero body bias threshold voltage equal to VtFBB, with the parameters other than the net channel doping level being unchanged. In another embodiment, the semiconductor circuit includes a first circuit including a first group of field effect transistors having a body. The circuit also includes a first voltage source to provide a first voltage to the body such that the field effect transistors have a forward body bias, the first voltage being at a level leading to the circuit experiencing a reduced rate of soft error failures as compared to when the circuit is not forward biased.
79 Citations
31 Claims
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1. A semiconductor circuit, comprising:
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a first group of field effect transistors having a body and parameters including a net channel doping level DL1; and
a conductor to provide a first voltage to the body to forward body bias the first group of transistors, the first group of transistors having a forward body bias threshold voltage (VtFBB) when forward body biased, wherein DL1 is at least 25% higher than a net channel doping level in the first group of transistors that would result in a zero body bias threshold voltage equal to VtFBB, with the parameters other than the net channel doping level being unchanged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A semiconductor circuit, comprising:
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a first group of field effect transistors having a first body and parameters including a net channel doping level DL1;
a second group of field effect transistors having a second body and parameters including the net channel doping level DL1;
a first conductor to provide a first voltage to the first body to forward body bias the first group of field effect transistors, the first group of field effect transistors having a forward body bias threshold voltage (VtFBB) when forward body biased, wherein DL1 is higher than a net channel doping level in the first group of field effect transistors that would result in a zero body bias threshold voltage equal to VtFBB, with the parameters other than the net channel doping level being unchanged; and
a second conductor to provide a second voltage to the second body to non-forward body bias the second group of field effect transistors. - View Dependent Claims (17, 18, 19, 20)
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21. A method for manufacturing semiconductor circuits in a die, comprising:
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fabricating a first group of field effect transistors to have a selected forward body bias threshold voltage; and
fabricating a second group of field effect transistors to have a selected zero body bias threshold voltage, the first and second group of field effect transistors including parameters including a net channel doping level, the net channel doping level being at least 25% higher than that which would provide a zero body bias threshold voltage equal to the forward body bias threshold voltage without a forward body bias with other the parameters being unchanged. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for manufacturing semiconductor circuits in a die, comprising:
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selecting a target leakage current upper limit and a target switching speed lower limit;
fabricating a conductor to provide a forward body bias voltage; and
fabricating first and second groups of field effect transistors to have parameters including threshold voltages to have leakage be lower than the target leakage current upper limit, the first group of field effect transistors receiving the forward body bias voltage, the forward body bias voltage being such that the switching speed of the first group of field effect transistors is above the target switching speed lower limit, and wherein the first and second group of field effect transistors have parameters including a channel doping level that is higher than that which would provide leakage equal to the target leakage current upper limit at zero body bias with the other parameters being unchanged, wherein the net doping level is at least 25% higher than that which would provide leakage equal to the target leakage current upper limit at zero body bias with the other parameters being unchanged. - View Dependent Claims (31)
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Specification