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US 4,904,952 AGranted
Differential amplifier incorporating negative resistance
AssigneeKabushiki Kaisha Toshiba
InventorHiroshi Tanimoto
Life of this patent
Estimating the term…
Abstract
A differential amplifier capable of achieving a large amplification, a wide frequency range, a high common mode rejection ratio, and a wide dynamic range simultaneously includes a device to produce negative resistance connected to output terminals. The differential amplifier also includes level shift circuits to generate additional voltages.
Claims27
A differential amplifier, comprising:
- first input terminals;
- first output terminals;
- first load resistor means connected to the first output terminals for generating output voltages;
- first negative resistance means for producing negative such that a resistance value in a numerator of a fraction expressing the gain of the differential amplifier is maximized, the first negative resistance means including first level shaft circuit means for producing additional voltages, the first negative resistance means being connected to the first output terminals;
- a first pair of transistors having emitters connected to each other, collectors connected to the first output terminals, and bases coupled to the first input terminals;
- and
- first current source means connected to the emitters of the first pair of transistors for providing emitter currents to the first pair of transistors.
4 more elements
A differential amplifier, comprising:
- first input terminals;
- first output terminals;
- first load resistor means connected to the first output terminals for generating output voltages;
- first negative resistance means for producing negative resistance such that a resistance value in a numerator of a fraction expressing the gain of the differential amplifier is maximized, the first negative resistance means including first level shift circuit means for producing additional voltages, the first negative resistance means being connected to the first output terminals;
- a first pair of transistors having source terminals connected to each other, drain terminals connected to the first output terminals, and gate terminals coupled to the first input terminals;
- and
- first current source means connected to the source terminals of the first pair of transistors for providing currents to the first pair of transistors.
4 more elements
Dependencies are inferred from the claim text.