High frequency amplifier

Details High frequency amplifier High frequency amplifier

2011-03-15

2011-03-15

Choe, Henry K (Department: 2817)

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

C330S295000

Reexamination Certificate

active

07907009

ABSTRACT:
Provided is a high frequency amplifier including two amplifying elements of different element sizes connected in parallel and switching the amplifying elements in accordance with a level of output power. In particular, the high frequency amplifier includes an output matching circuit for matching to characteristic impedance (50 ohms) both when the output power is high and low, and increasing impedance when the turned-off amplifying element is viewed from a connection node on an output side of the two amplifying elements. Consequently, characteristics such as high output power and high efficiency can be achieved and it is possible to prevent an amplified high frequency signal from passing around to a matching circuit on a turned-off amplifying element side.

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Kim, Ji Hoon et al., “A Power Efficient W-CDMA Smart Power Amplifier With Emitter Area Adjusted For Output Power Levels”, International Microwave Symposium, IEEE MTT-S Digest, pp. 1165-1168, (2004).
European Patent Appln. No. 06 833 794.8, European Extended Search Report, dated Dec. 13, 2010, pp. 1-4.

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