High speed common mode logic circuit
First Claim
1. A logic circuit, comprising:
- a bias circuit having a first pair of MOS transistors and a third MOS transistor, wherein one of said first pair of transistors has an aspect ratio greater than an aspect ratio of the other of the first pair of transistors causes said third MOS transistor to operate in a triode region; and
a logic portion having a plurality of pairs of input MOS transistors, and a plurality of load MOS transistors, a respective one of which is coupled to each pair of input MOS transistors, wherein said bias circuit causes each of the load MOS transistors to operate in the triode region.
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Accused Products
Abstract
A common mode logic (CML) circuit having an improved bias circuit and an active MOS load operating exclusively in the triode region to provide improved performance characteristics including a high speed of operation. The bias circuit of the CML circuit comprises a pair of MOS transistors, one of which has an aspect ratio (WP /LP) and the other of which has an aspect ratio (WP /LP)/n, wherein 1<n<4. This configuration causes a third MOS transistor in the bias circuit to operate exclusively in the triode region. The CML circuit also includes a logic portion, which may be a logic gate or flip-flop, having a plurality of pairs of input MOS transistors for receiving differential input signals. In accordance with the invention, the logic portion has load MOS transistors which operate exclusively in the triode region.
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Citations
11 Claims
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1. A logic circuit, comprising:
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a bias circuit having a first pair of MOS transistors and a third MOS transistor, wherein one of said first pair of transistors has an aspect ratio greater than an aspect ratio of the other of the first pair of transistors causes said third MOS transistor to operate in a triode region; and a logic portion having a plurality of pairs of input MOS transistors, and a plurality of load MOS transistors, a respective one of which is coupled to each pair of input MOS transistors, wherein said bias circuit causes each of the load MOS transistors to operate in the triode region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification