Power amplifier

• US 20030045252A1
• Filed: 08/26/2002
• Published: 03/06/2003
• Est. Priority Date: 09/05/2001
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Nam, Sueng-il
• Application Number:
  US10/227,715
• Publication Number:
  US 20030045252A1
• Time in Patent Office: Days
• US Class Current: 455/127.1
• CPC Class Codes: H03F 1/56 Modifications of input or output impedances, not otherwise provided for
• CPC Class Codes: H03F 2200/222 A circuit being added at the input of an amplifier to adapt the input impedance of the amplifier
• CPC Class Codes: H03F 2200/387 A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier
• CPC Class Codes: H03F 2200/451 the amplifier being a radio frequency amplifier
• CPC Class Codes: H03F 3/189 High-frequency amplifiers, e.g. radio frequency amplifiers
• CPC Class Codes: H04B 1/0458 Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages matching circuits in general H03H

Abstract

A radio frequency power amplifier (16) for use in at least 2 frequency bands, comprises a power amplifier (32) having a passive adjustable input matching network (30), a passive variable output power matching network (34, 36) and a source (48) of tuning voltages for adjusting the input and output networks so that the power amplifier functions as a narrowband amplifier in a predetermined one of the at least 2 frequency bands. The source of tuning voltages may comprise a look-up table.

Claims

1. A radio frequency power amplifier for use in at least 2 frequency bands, comprising a power amplifier having a passive adjustable input matching network, a passive variable output power matching network and means for adjusting the input and output networks so that the power amplifier functions as a narrowband amplifier in a predetermined one of the at least 2 frequency bands.

2. A power amplifier as claimed in claim 1, characterised in that the output power matching network comprises a variable real part matching network and a variable imaginary part matching network.

3. A power amplifier as claimed in claim 2, characterised in that the imaginary part matching network comprises a variable shunt capacitance.

4. A power amplifier as claimed in claim 3, characterised in that the variable shunt capacitance comprises a high-Q capacitance.

5. A power amplifier as claimed in claim 2, characterised in that the real part matching network comprises a variable resistance.

6. A power amplifier as claimed in claim 2, characterised in that the adjustable input matching network comprises a variable resonator type matching network.

7. A power amplifier as claimed in claim 6, characterised by means for supplying tuning voltages for varying at least one characteristic of the variable real part matching network, of the variable imaginary part matching network and of the variable resonator type matching network.

8. A power amplifier as claimed in claim 7, characterised in that the means for supplying tuning voltages comprises a look-up table storing tuning voltages applicable to each of the at least 2 frequency bands.

9. A module comprising a power amplifier as claimed in anyone of claims 1 to 8.

10. A transmitter including a radio frequency power amplifier for use in at least 2 frequency bands, the power amplifier having a passive adjustable input matching network, a passive variable output power matching network and means for adjusting the input and output networks so that the power amplifier functions as a narrowband amplifier in a predetermined one of the at least 2 frequency bands.