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US 4,053,795 AGranted
Low level field effect transistor amplifier
AssigneeTexas Instruments Incorporated
InventorMichael J. Cochran
Life of this patent
Estimating the term…
Abstract
A pair of input field effect transistors are arranged as a differential pair having an electrode of each connected in common and connected in turn to a circuit common by means of a third field effect transistor. A pair of output field effect transistors are coupled to the input field effect transistors and have an electrode of each connected in common and coupled to the gate of the third field effect transistor, thereby providing an amplifier which relatively insensitive to change in the threshold voltage of the field effect transistors.
Claims16
A low-level field effect transistor amplifier comprising:
- a. A pair of input field effect transistors arranged as a differential pair, each input field effect transistor having first and second electrodes and a gate;
- b. field effect transistor means for connecting the first electrodes of said input field effect transistors to a circuit common, said field effect transistor means having at least one gate;
- c. a pair of output field effect transistors, each output field effect transistor having first and second electrodes and a gate;
- d. a first field effect transistor having first and second electrodes and a gate, the gate of which is connected to the second electrode of one of said input field effect transistors and the first electrode of which is coupled to the gate of one of said output field effect transistors;
- e. a second field effect transistor having first and second electrodes and a gate, the gate of which is coupled to the second electrode of the other of said input field effect transistors and the first electrode of which is coupled to the gate of the other of said output field effect transistors;
- f. first circuit means for resistively coupling the first electrodes of said output field effect transistors to said circuit common;
- and
- g. second circuit means for connecting the first electrodes of said output field effect transistors to said at least one gate of said field effect transistor means.
5 more elements
Dependencies are inferred from the claim text.