Mobile radio apparatus and radio unit

• US 7,155,251 B2
• Filed: 02/26/2003
• Issued: 12/26/2006
• Est. Priority Date: 02/26/2002
• Status: Expired due to Fees

• Current Assignee: Fujitsu Mobile Communications Limited (Fujitsu Limited)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Aisaka, Hideki, Saruwatari, Eiji
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US10/372,863
• Publication Number:
  US 20030162513A1
• Time in Patent Office: 1,399 Days
• Field of Search: 455/550.1, 455/552.1, 455/127.1, 455/127.2, 455/127.3, 455/127.5, 455/103, 455/127.4, 330/285, 330/295, 330/296
• US Class Current: 455/552.1
• CPC Class Codes: H03F 1/0261 with control of the polarisation voltage or current, e.g. gliding Class A
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04B 1/1615 Switching on; Switching off, e.g. remotely battery saving circuits associated with selective call operation H04W52/00; details of power consumption reduction in a PLL, H03L7/0802, H03L7/14, H03L2207/08, H03L2207/18; muting amplifiers by gain control see H03G3/34
• CPC Class Codes: H04W 52/0274 by switching on or off the equipment or parts thereof
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A plurality of amplifiers corresponding to a plurality of types of transmitting signals are provided to amplify the transmitting signals to a power level at which they can be transmitted by radio. The amplifiers are driven by both power and a bias. The bias is supplied to one of the amplifiers that amplifies a to-be-transmitted transmitting signal.

Claims

1. A mobile radio apparatus which transmits a first radio transmitting signal or a second radio transmitting signal, the mobile radio apparatus comprising:

a first amplifier driven by a power signal and a bias signal separate from the power signal, the first amplifier configured to amplify the first radio transmitting signals to a power level for transmission;

a second amplifier driven by the power signal and the bias-signal, the second amplifier configured to amplify the second radio transmitting signal to a power level for transmission;

a switching circuit configured to turn ON/OFF the power supplied to the first and second amplifiers;

a bias supply unit configured to supply the bias to selectively one of the first and second amplifiers; and

a control unit configured to control the bias supply unit to supply the bias to the first amplifier and to control the switching circuit to turn ON the power supplied to the first and second amplifiers, when the first radio transmitting signal is to be transmitted, and to control the bias supply unit to supply the bias to the second amplifier and to control the switching circuit to turn ON the power supplied to the first and second amplifiers, when the second radio transmitting signal is to be transmitted.

2. The mobile radio apparatus according to claim 1, wherein the first and second radio transmitting signals are associated with a frequency band.

3. The mobile radio apparatus according to claim 1, further comprising an antenna unit configured to transmit each of the amplified first and second radio transmitting signals.

4. A radio unit in a mobile radio apparatus, the radio unit comprising:

a first amplifier driven by a power signal and a first bias signal separate from the power signal, the first amplifier configured to amplify the first radio transmitting signal to a power level for transmission;

a second amplifier driven by the power signal and a second bias signal separate from the power signal, the second amplifier configured to amplify the second radio transmitting signal to a power level for transmission;

a switching circuit configured to turn ON/OFF the power supplied to the first and second amplifiers;

a bias supply unit configured to supply the bias to selectively one of the first and second amplifiers; and

a control unit configured to control the bias supply unit to supply the bias to the first amplifier and to control the switching circuit to turn ON the power supplied to the first and second amplifiers, when the first radio transmitting signal is to be transmitted, and to control the bias supply unit to supply the bias to the second amplifier and to control the switching circuit to turn ON the power supplied to the first and second amplifiers, when the second radio transmitting signal is to be transmitted.

5. The radio unit according to claim 4, wherein the first and second radio transmitting signals are associated with a frequency band.

6. The radio unit according to claim 4, wherein each of the amplified first and second radio transmitting signals is transmitted by an antenna unit.