Current consumption reduction with low power amplifier

• US 7,738,539 B2
• Filed: 12/01/2006
• Issued: 06/15/2010
• Est. Priority Date: 12/01/2006
• Status: Expired due to Fees

• Current Assignee: Sony Ericsson Mobile Communications USA Incorporated (Sony Group Corp.)
• Original Assignee: Sony Ericsson Mobile Communications USA Incorporated (Sony Group Corp.)
• Inventors: Johnson, Phillip Marc, Camp, William O. Jr., Tudosoiu, Bogdan
• Primary Examiner(s): Bayard; Emmanuel
• Application Number:
  US11/565,925
• Publication Number:
  US 20080130786A1
• Time in Patent Office: 1,292 Days
• Field of Search: 375219-220, 375/267, 375/297, 375/299
• US Class Current: 375/219
• CPC Class Codes: H03F 1/0205 in transistor amplifiers
• CPC Class Codes: H03F 1/0277 Selecting one or more amplifiers from a plurality of amplifiers
• CPC Class Codes: H03F 2200/417 A switch coupled in the output circuit of an amplifier being controlled by a circuit
• CPC Class Codes: H03F 2200/451 the amplifier being a radio frequency amplifier
• CPC Class Codes: H03F 2200/465 Power sensing
• CPC Class Codes: H03F 2203/21157 A filter circuit being added at the output of a power amplifier stage
• CPC Class Codes: H03F 3/189 High-frequency amplifiers, e.g. radio frequency amplifiers
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H03F 3/24 of transmitter output stages

Abstract

A transceiver circuit and a method in a wireless communication network are provided, where a signal power level for a signal received at the transceiver circuit is measured and compared to a predefined threshold power level. At least two groups of power amplifiers may be used, where one group is optimized for high efficiency above the predefined threshold power level, and one group is optimized for high efficiency below the predefined threshold power level. The amplifiers may be used to amplify the received signal depending on the signal power level in relation to the predefined power threshold level. The signal may then be filtered by duplex filters and forwarded to a diversity antenna or a main antenna where it is transmitted over an air interface.

Claims

1. A transceiver for a wireless communication network, the transceiver comprising

a transceiver module to determine a signal power for each of a plurality of signals to be transmitted, where the transceiver module determines that:

a first signal, of the plurality of signals, is associated with a signal power above a particular power threshold, and

a second signal, of the plurality of signals, is associated with a signal power below the power threshold;

a directing unit to direct;

the first signal to one or more first amplifiers, where said one or more first amplifiers have high efficiency at signal powers above the power threshold, and

the second signal to one or more second amplifiers, where said one or more second amplifiers have high efficiency at signal powers below the power threshold;

an isolation arrangement module, connected to the one or more first amplifiers, to prevent signal reflections of the first signal when amplified by the one or more first amplifiers; and

an antenna module that includes a first diversity antenna and a first main antenna, the antenna module to transmit, as output signals, amplified signals received from at least one of the one or more first amplifiers or the one or more second amplifiers,

where the first diversity antenna, and not the first main antenna, receives the first signal, when amplified by the one or more first amplifiers, and

where the first main antenna, and not the first diversity antenna, receives the second signal, when amplified by the one or more second amplifiers.

2. The transceiver according to claim 1, where at least one of the first diversity antenna or the first main antenna is further to:

receive input signals from other devices in the wireless communication network.

3. The transceiver according to claim 2, where the transceiver further comprises:

a filter to separate the amplified signals, when transmitted via the antenna module, from the input signals.

4. The transceiver according to claim 1, further comprising another antenna module that includes:

a second diversity antenna, and

a second main antenna,

the other antenna module to receive signals from other devices in the wireless communication network.

5. The transceiver according to claim 1, further comprising:

a switch to select one of the first diversity antenna or the first main antenna to transmit the output signals.

6. The transceiver according to claim 5, where the switch is further to:

connect, to ground, a non-selected one of the first diversity antenna or the first main antenna.

7. The transceiver according to claim 6, where the switch is one of:

a singe pole single throw switch,

a double pole double throw switch,

a single pole double throw switch,

a single pole change over switch, or

other type of switch to change between the first diversity antenna and the first main antenna.

8. The transceiver according to claim 7, where the amplified signals from at least one of the one or more first amplifiers or the one or more second amplifiers include one of:

wideband carrier division multiple access (WCDMA) signals, or

combined global system for mobile communications/enhanced data rates for global evolution (GSM/EDGE) signals and WCDMA signals.

9. The transceiver according to claim 5, where the switch is one of:

a singe pole single throw switch,

a double pole double throw switch,

a single pole double throw switch,

a single pole change over switch, or

another type of switch to change between the first diversity antenna and the first main antenna.

10. The transceiver according to claim 1, where the amplified signals from the one or more first amplifiers and the one or more second amplifiers are one of:

WCDMA signals, or

combined GSM/EDGE signals and WCDMA signals.

11. A method implemented by a transceiver in a wireless communication network, the method comprising:

receiving a signal;

determining a power at which the signal is to be sent;

comparing the power at which the signal is to be sent to a particular power threshold;

directing the signal, when the power is above the particular power threshold, to a first amplifier with high efficiency at signal powers above the particular power threshold

directing the signal, when the power is below the particular power threshold, to a second amplifier with high efficiency at signal powers below the particular power threshold;

amplifying the signal at the one of the first amplifier or the second amplifier to which the signal is directed;

sending the amplified signal to one of a first diversity antenna or a first main antenna, where the first diversity antenna receives the amplified signal when amplified by the first amplifier, and where the first main antenna receives the amplified signal when amplified by the second amplifier; and

transmitting the amplified signal over a radio interface via the first diversity antenna or the first main antenna to which the amplified signal is sent.

12. The method of claim 11, further comprising:

receiving a received signal from another device in the wireless communication network; and

filtering the transmitted amplified signal from the received signal.

13. The method of claim 12, where the received signal is received via at least one of second diversity antenna and a second main antenna.

14. The method of claim 11, where sending the amplified signal includes switching between one of the first diversity antenna or the first main antenna to transmit the output signals.

15. The method of claim 14, where sending the amplified signal includes connecting, to ground, the other one of the first diversity antenna or the first main antenna.

16. The method of claim 11, where the amplified signal includes one of:

wideband carrier division multiple access (WCDMA) signals, or

combined global system for mobile communications/enhanced data rates for global evolution (GSM/EDGE) signals and WCDMA signals.