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US 7,119,618 B2Granted
Method of forming a wide bandwidth differential amplifier and structure therefor
AssigneeSemiconductor Components Industries, LLC
InventorIra E. Baskett
Life of this patent
Estimating the term…
Abstract
In one embodiment, a differential amplifier uses a diode coupled transistor and a series resistor to set a Voh output level and uses another transistor in parallel with the diode coupled transistor and resistor to set a Vol output level.
Claims14
A differential amplifier having high and low states comprising:
- a first transistor having a first current carrying electrode, a second current carrying electrode, and a control electrode;
- a second transistor coupled to the first transistor to form a differential pair, the second transistor having a first current carrying electrode, a second current carrying electrode, and a control electrode;
- a first diode coupled transistor and a first resistor coupled between the first current carrying electrode of the first transistor and a power source;
- a first output of the differential amplifier coupled between the first diode coupled transistor and the first resistor;
- a third transistor coupled between the first current carrying electrode of the first transistor and the power source;
- and
- a fourth transistor coupled to the control electrode of the third transistor and configured to provide a bias voltage that sets the low state output voltage of the differential amplifier.
4 more elements
A method of forming a differential amplifier having high and low states comprising:
- coupling a first transistor and a second transistor as a differential pair of the differential amplifier;
- coupling a first diode coupled transistor to the first transistor to establish a high state level of an output of the differential amplifier;
- coupling a first output of the differential amplifier between the first diode coupled transistor and a first resistor;
- and
- coupling a second diode coupled transistor in parallel with the first diode coupled transistor to establish a low state level of the output of the differential amplifier.
2 more elements
A method of forming a differential amplifier having high and low states comprising:
- coupling a first transistor and a second transistor as a differential pair of the differential amplifier;
- coupling a first diode coupled transistor to the first transistor to establish a high state level of an output of the differential amplifier;
- coupling a first output of the differential amplifier coupled between the first diode coupled transistor and a first resistor;
- and
- coupling a third transistor to the first transistor to establish a low state level of the output of the differential amplifier wherein the third transistor and the first diode coupled transistor are coupled in parallel and a first current carrying electrode of the first transistor is coupled to a current carrying electrode of both the third transistor and the first diode coupled transistor.
2 more elements
Dependencies are inferred from the claim text.