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US 2018/0278221 A1Published application
Differential amplifier circuit
AssigneeAblic Inc.
InventorsToshiyuki TSUZAKI, Masakazu SUGIURA
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Abstract
To perform a rail-to-rail input operation, provided is a differential amplifier circuit including a first differential input pair and a second differential input pair which has a threshold value different from that of the first differential input pair. Both the differential input pairs do not operate at the same time. A transistor is connected between the first differential input pair and a current source to achieve a configuration in which the first differential input pair and the second differential input pair do not operate at the same time.
Claims3
A differential amplifier circuit, comprising:
- an inverting input terminal;
- a non-inverting input terminal;
- an output terminal;
- a first differential input pair configured to receive input from the inverting input terminal and the non-inverting input terminal;
- a second differential input pair configured to receive input from the inverting input terminal and the non-inverting input terminal, the second differential input pair including transistors that have a threshold value different from a threshold value of transistors included in the first differential input pair;
- a current source configured to supply current to the second differential input pair;
- and
- a switch provided between the first differential input pair and the current source, and is configured to be turned on and off in accordance with a voltage across the inverting input terminal and the non-inverting input terminal.
5 more elements
Dependencies are inferred from the claim text.