Two-Phase Dynamic Logic Circuits for Gallium Arsenide Complementary HIGFET Fabrication
Fouts, Douglas Jai
Shehata, Khaled Ali
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A two-phase dynamic logic circuit for complementary GaAs HIGFET fabrication processes has a precharge transistor connected between a precharge voltage source and an output node of the logic circuit. The precharge transistor is controlled by a clock signal such that the output node precharges when the clock signal is low and is isolated from the precharge voltage source when the clock signal is high. An evaluate transistor connected to the output node and an NFET logicock has a first terminal connected to the evaluate transistor such that the evaluate transistor is between the NFET logicock and the output node. A second terminal of the logicock is connected to a voltage source and a data input terminal that is arranged to receive data input signals. The NFET logicock includes on or more transistor(s) is arranged to generate a logic value. The evaluate transistor is controlled by the clock signal such that when the clock signal is low, the output node is isolated form the NFET logicock, and when the clock signal is high, the logic value generated by the logicock is allowed to determine the voltage on the output node of the logic circuit. A pass-gate is arranged to receive an input signal and conditionally pass the input signal to the gate(s) of the transistor(s) in the NFET logicock under the control of the clock signal such that the input is allowed to influence the gate voltage of the evaluation transistor when the clock signal is low, but is not allowed to influence the gate voltage of the transistor(s) in the logicock when the clock signal is high.
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