Field effect current mode logic gate
First Claim
1. A field effect current mode logic gate comprised of:
- a field effect current source means for supplying a constant current;
a field effect differential amplifier means having first and second branches coupled between said current source means and a power source means for passing respective portions of said constant current;
said first branch including a plurality of parallel coupled enhancement field effect transistors having a positive threshold voltage and having respective gates for receiving respective input logic signals; and
said second branch including a depletion field effect transistor having a negative threshold voltage and a grounded gate, whereby the magnitudes of said current portions in said first and second branches are representative of the magnitude of said input logic signals relative to said positive threshold voltage plus the absolute value of said negative threshold voltage.
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Accused Products
Abstract
Disclosed is a field effect current mode logic gate comprised of a current source for supplying a constant current, and a differential amplifier having first and second branches for passing respective portions of the constant current. The first branch includes a plurality of parallel-coupled or serially-coupled enhancement field effect transistors having a positive threshold voltage and having respective gates for receiving respective input logic signals; and the second branch includes a depletion field effect transistor having a negative threshold voltage, and a grounded gate. The magnitudes of the current portions in the first and second branches are representative of the magnitude of the input logic signals relative to the positive threshold voltage plus the absolute value of the negative threshold voltage.
56 Citations
11 Claims
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1. A field effect current mode logic gate comprised of:
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a field effect current source means for supplying a constant current; a field effect differential amplifier means having first and second branches coupled between said current source means and a power source means for passing respective portions of said constant current; said first branch including a plurality of parallel coupled enhancement field effect transistors having a positive threshold voltage and having respective gates for receiving respective input logic signals; and said second branch including a depletion field effect transistor having a negative threshold voltage and a grounded gate, whereby the magnitudes of said current portions in said first and second branches are representative of the magnitude of said input logic signals relative to said positive threshold voltage plus the absolute value of said negative threshold voltage. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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2. A field effect current mode logic gate comprised of:
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a field effect current source means for supplying a constant current; a field effect differential amplifier means having first and second branches coupled between said current source means and a power source means for passing respective portions of said constant current; said first branch including a plurality of serially coupled enhancement field effect transistors having a positive threshold voltage and having respective gates for receiving respective input logic signals; and said second branch including a depletion field effect transistor having a negative threshold voltage and a grounded gate, whereby the magnitudes of said current portions in said first and second branches are representative of the magnitude of said input logic signals relative to said positive threshold voltage plus the absolute value of said negative threshold voltage.
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Specification