Activ shunt-peaked logic gates
First Claim
Patent Images
1. A circuit comprising:
- at least one logic gate comprising at least two differential inputs lines and at least two differential output lines;
at least two resistive elements coupled to a biasing voltage; and
at least two transistors, each one of said transistors is coupled in series to one of said resistive elements so as to provide an inductance between said differential output lines and said resistive elements.
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Abstract
A logic circuit employs a shunt peaked technique to enhance the switching speed of the circuit without an increase in power dissipation. A differential logic gate implements a digital circuit function. The shunt peaked logic circuit includes two resistive and two inductive elements. For each differential output line, a resistive element is coupled in series to an inductive element so as to couple the circuit power supply voltage to a differential output line. Under this configuration, the bandwidth of the logic circuit is increased without an increase in power consumption. The logic circuit may be implemented using CML or ECL logic.
12 Citations
29 Claims
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1. A circuit comprising:
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at least one logic gate comprising at least two differential inputs lines and at least two differential output lines;
at least two resistive elements coupled to a biasing voltage; and
at least two transistors, each one of said transistors is coupled in series to one of said resistive elements so as to provide an inductance between said differential output lines and said resistive elements. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for high-speed switching of a logic gate, said method comprising the steps of:
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providing at least one logic gate comprising at least two inputs lines and at least two differential output lines;
coupling a first resistive element to a biasing voltage;
coupling said first resistive element in series to a first transistor such that said first transistor provides an inductance between a first differential output line of said logic gate and said first resistive element;
coupling a second resistive element to a biasing voltage; and
coupling said second resistive element in series to a second transistor such that said second transistor provides an inductance between a second differential output line of said logic gate and said second resistive element. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A circuit comprising:
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at least one logic gate comprising an input line and an output line;
a resistive element coupled to a biasing voltage; and
a transistor, coupled in series to said resistive element, so as to provide an inductance between said output line and said resistive element. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A circuit comprising:
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at least one multi-stage logic gate comprising at least two differential inputs lines and at least two differential output lines, said multi-stage logic gate comprising more than a single logic stage;
at least two resistive elements; and
at least two inductive elements, each one of said inductive elements is coupled in series to one of said resistive elements and is coupled to one of said outputs such that said inductive elements couple said differential output lines to a power supply input. - View Dependent Claims (23, 24)
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25. A circuit comprising:
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at least one multi-stage logic gate comprising an input line and an output line, said multi-stage logic gate comprising more than a single logic stage;
a resistive element; and
at least one inductive element, coupled to said resistive element and coupled to said output such that said inductive element couples said output line to a power supply input. - View Dependent Claims (26, 27)
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28. A circuit comprising:
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at least one logic gate comprising at least two differential inputs lines and at least two differential output lines;
at least two resistive elements, each of said resistive element is coupled to a biasing voltage; and
at least two MOS transistors, each one of said transistors is coupled to one of said resistive elements and is coupled to one of said differential output lines such that said transistors couple said differential output lines to a power supply input, wherein a gate of each of said MOS transistors is coupled to one of said resistive elements, a drain of each of said MOS transistors is coupled to a power supply voltage, and a source of each of said MOS transistors is coupled to said differential output lines.
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29. A circuit comprising:
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at least one logic gate comprising at least two differential inputs lines and at least two differential output lines;
at least two resistive elements, each of said resistive element is coupled to a biasing voltage; and
at least two bipolar transistors, each one of said transistors is coupled to one of said resistive elements and is coupled to one of said differential output lines such that said transistors couples said differential output lines to a power supply input, wherein a base of each of said bipolar transistors is coupled to one of said resistive elements, a collector of each of said bipolar transistors is coupled to a power supply voltage, and an emitter of each of said bipolar transistors is coupled to said differential output lines.
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Specification