Amplifier circuit
AssigneeNEC Corporation
InventorKoichi Hoshino
Life of this patent
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Abstract
An amplifier circuit can operate stably without increasing a consumed current even when a direct current amplification of a transistor is fluctuated due to tolerance in manufacturing process. The amplifier circuit has a first transistor having an emitter grounded. A second transistor has an emitter connected to a collector of said first transistor and a collector connected to a power source via a load and a first bias resistor circuit network. A third transistor constructs a current mirror circuit together with said first transistor and receives a bias current via a second bias resistor circuit network. The second bias resistor circuit network has a power source side terminal connected to a junction point between said load and said first bias resistor circuit network.
Claims5
An amplifier circuit comprising:
- a first transistor having an emitter grounded;
- a second transistor having an emitter connected to a collector of said first transistor and having a collector connected to a power source via a load and a first bias resistor circuit network;
- a third transistor constructing a current mirror circuit together with said first transistor and receiving supply of a bias current via a second bias resistor circuit network;
- and
- said second bias resistor circuit network having a power source side terminal connected to a junction point between said load and said first bias resistor circuit network.
Dependencies are inferred from the claim text.