Amplifying circuit
AssigneeFujitsu Limited
InventorsSatoshi Ide, Norio Ueno
Life of this patent
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Abstract
In an amplifying circuit composed of a basic amplifier and a bias circuit thereof, a drive transistor drives a load transistor, and a reference current source biases a drive-side and a load-side supporting bias transistors with a constant current for generating a bias voltage of the load transistor. Also, a load resistor or a drive-side common-gate transistor is inserted between the drive transistor and the load transistor. Also, a load-side common-gate transistor is inserted between the load transistor and a power supply. In addition, the bulks and sources of the load transistor and the load-side supporting bias transistor are short-circuited.
Claims15
An amplifying circuit comprising:
- an amplifier including a drive transistor and a load transistor driven by the drive transistor, and
- a bias circuit composed of a series circuit of a drive-side supporting bias transistor having a gate-drain short-circuited, a load-side supporting bias transistor having a gate-drain short-circuited for outputting a bias voltage of the load transistor from a drain, and a reference current source for biasing the drive-side and the load-side supporting bias transistors with a constant current.
Dependencies are inferred from the claim text.