Amplifier; and transmitter and communication device incorporating the same

Patent 7199652 Issued on April 3, 2007. Estimated Expiration Date:

November 16, 2024. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Amplifier circuit with bipolar transistors
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Inventor: Dick

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Inventors

Assignee

Matsushita Electric Industrial Co., Ltd.

Application

No. 10988499 filed on 11/16/2004

US Classes:

327/560, Nonlinear amplifying circuit330/294, Having frequency-responsive means or phase-shift means in feedback path330/302, Including frequency-responsive means in the signal transmission path42/16, Rearward455/108, Amplitude modulation330/282, Having feedback means acting as variable impedance330/65, INVOLVING STRUCTURE OTHER THAN THAT OF TRANSFORMERS PER SE455/341, Amplifier330/311Having different configurations

Examiners

Primary: Ton, My-Trang Nu

Attorney, Agent or Firm

Wenderoth, Lind & Ponack, L.L.P.

International Classes

G06G 7/12
H03F 1/34

Abstract

The present invention provides an amplifier for amplifying a high-frequency signal and outputting an amplified signal. The amplifier includes: an amplification element which is a bipolar transistor or a field-effect transistor; and an inductor connected between a base and a collector or between a gate and a drain of the amplification element. The inductance of the inductor is chosen so that, within a predetermined frequency range, a parallel resonance occurs with a parasitic capacitor of the amplification element and an intrinsic capacitor of the amplification element, the intrinsic capacitor being a base-collector capacitance or a gate-drain capacitance.