Amplifier with self-bias boosting using an enhanced wilson current mirror biasing scheme
AssigneeKoninklijke Philips Electronics N.V.
InventorSifen Luo
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Abstract
A power amplifier circuit comprises an amplifying transistor and a dc bias circuit, which comprises an enhanced Wilson current mirror as a self-bias boosting circuit for biasing the amplifying transistor through a bias resistor. The current source and the bias resistor are configured to make the charging rate faster than the discharging rate. Furthermore, the current source of the enhanced Wilson current mirror dictates the quiescent current of the amplifying transistor. Preferably, the quiescent current may be set as in direct proportion to the current source by scaling the emitter area ratios between transistor pairs.
Claims20
A power amplifier circuit, comprising an amplifying transistor and a dc bias circuit, wherein said dc bias circuit comprises a self-bias boosting circuit including an enhanced Wilson current mirror circuit, a portion of which charges said amplifier circuit, and a portion of which discharges said amplifier circuit, said charging and discharging rates being different.
A power amplifier circuit for amplifying an input power, said amplifier comprising an amplifying transistor and a dc bias circuit, wherein said dc bias circuit comprises a self-bias boosting circuit capable of charging and discharging said amplifying transistor with a charging rate faster than a discharging rate whereby an average voltage between a control terminal and a common terminal of said amplifying transistor increases as said input power increases.
A power amplifier circuit for amplifying an input signal, said amplifier comprising an amplifying transistor and a dc bias circuit including a self-bias boosting circuit, wherein said self-bias boosting circuit comprises a charging circuit for charging said amplifying transistor at a charging rate and a discharging circuit for discharging said amplifying transistor at a discharging rate, wherein said self-bias boosting circuit is configured such that said charging rate is faster than said discharging rate.
Dependencies are inferred from the claim text.