# US 10,484,024 B2 · Transmission unit

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- Number: US 10,484,024 B2
- Document ID: US10484024B2
- Status: Granted
- Kind: B2
- Application number: 16/211,940
- Filed: 2018-12-06
- Published: 2019-06-13
- Granted: 2019-11-19
- Earliest claimed: 2017-12-07
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Kiichiro Takenaka
- Web page: https://patentgrep.com/patent/US10484024B2

## CPC

- H04B 1/04: Circuits
- H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)}
- H04W 52/0251: {using monitoring of local events, e.g. events related to user activity}
- H04W 52/0261: {managing power supply demand, e.g. depending on battery level}
- H04W 52/362: {Aspects of the step size}
- H04B 2001/045: {with means for improving efficiency}
- Y02D 30/70: in wireless communication networks
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A transmission unit includes: a power amplification module that amplifies the power of an input signal and outputs an amplified signal; and a power supply module that supplies a power supply voltage to the power amplification module on the basis of a first control signal corresponding to the band width of the input signal. On the basis of the first control signal, the power supply module varies the power supply voltage in accordance with the amplitude level of the input signal in the case where the band width of the input signal is a first band width and varies the power supply voltage in accordance with the average output power of the power amplification module in the case where the band width of the input signal is a second band width that is larger than the first band width.

## Claims

### Claim 1

A transmission unit comprising:
a power amplification circuit configured to amplify a power of an input signal and to output an amplified signal; and
a power supply circuit configured to supply a power supply voltage to the power amplification circuit based on a first control signal that corresponds to a band width of the input signal,
wherein the power supply circuit is configured to:
vary the power supply voltage in accordance with an amplitude level of the input signal when the band width of the input signal is a first band width, and
vary the power supply voltage in accordance with an average output power of the power amplification circuit when the band width of the input signal is a second band width,
wherein the second band width is larger than the first band width.

### Claim 2 (depends on 1)

The transmission unit according to claim 1, wherein the power amplification circuit comprises:
a divider configured to divide the input signal into a first signal and a second signal,
a carrier amplifier configured to amplify the first signal and to output a third signal,
a peak amplifier configured to amplify the second signal and to output a fourth signal,
a combiner configured to combine the third signal and the fourth signal, and to output the amplified signal, and
a bias circuit configured to supply a bias current or a bias voltage to the carrier amplifier and to the peak amplifier based on a second control signal corresponding to the band width of the input signal, and
wherein when the band width of the input signal is the second band width, the bias circuit is configured to adjust, based on the second control signal, the bias current or the bias voltage such that the carrier amplifier performs a class-A operation or a class-AB operation and the peak amplifier performs a class-C operation.

### Claim 3 (depends on 2)

The transmission unit according to claim 2, wherein the power supply circuit comprises:
a switching amplifier configured to step up or step down a prescribed voltage,
a linear amplifier configured to output the power supply voltage in accordance with the amplitude level of the input signal,
a second capacitor that has a first end connected to an output of the switching amplifier and a second end connected to an output of the linear amplifier, and
a switch circuit configured to connect the second end of the second capacitor to ground when the band width of the input signal is the second band width.

### Claim 4 (depends on 2)

The transmission unit according to claim 2, wherein when the band width of the input signal is the first band width, the bias circuit is configured to adjust, based on the second control signal, the bias current or the bias voltage such that the peak amplifier is in an off state.

### Claim 5 (depends on 4)

The transmission unit according to claim 4, wherein the combiner comprises:
a combining circuit that electrically connects an output of the carrier amplifier and an output of the peak amplifier at a node such that the third signal and the fourth signal are combined at the node,
an inductor that is serially connected between the output of the carrier amplifier and the node, and
a first capacitor that is serially connected between the output of the peak amplifier and the node, and
wherein the inductor delays a phase of the third signal by around 45° and advances a phase of the fourth signal by around 45°.

### Claim 6 (depends on 4)

The transmission unit according to claim 4, wherein the power supply circuit comprises:
a switching amplifier configured to step up or step down a prescribed voltage,
a linear amplifier configured to output the power supply voltage in accordance with the amplitude level of the input signal,
a second capacitor that has a first end connected to an output of the switching amplifier and a second end connected to an output of the linear amplifier, and
a switch circuit configured to connect the second end of the second capacitor to ground when the band width of the input signal is the second band width.

### Claim 7 (depends on 2)

The transmission unit according to claim 2, wherein the combiner comprises:
a combining circuit that electrically connects an output of the carrier amplifier and an output of the peak amplifier at a node such that the the third signal and the fourth signal are combined at the node, and
a ¼ wavelength line that is serially connected between the output of the carrier amplifier and the node.

### Claim 8 (depends on 7)

The transmission unit according to claim 7, wherein the power supply circuit comprises:
a switching amplifier configured to step up or step down a prescribed voltage,
a linear amplifier configured to output the power supply voltage in accordance with the amplitude level of the input signal,
a second capacitor that has a first end connected to an output of the switching amplifier and a second end connected to an output of the linear amplifier, and
a switch circuit configured to connect the second end of the second capacitor to ground when the band width of the input signal is the second band width.

### Claim 9 (depends on 2)

The transmission unit according to claim 2, wherein the combiner comprises:
a combining circuit that electrically connects an output of the carrier amplifier and an output of the peak amplifier at a node such that the third signal and the fourth signal are combined at the node,
an inductor that is serially connected between the output of the carrier amplifier and the node, and
a first capacitor that is serially connected between the output of the peak amplifier and the node, and
wherein the inductor delays a phase of the third signal by around 45° and advances a phase of the fourth signal by around 45°.

### Claim 10 (depends on 9)

The transmission unit according to claim 9, wherein the power supply circuit comprises:
a switching amplifier configured to step up or step down a prescribed voltage,
a linear amplifier configured to output the power supply voltage in accordance with the amplitude level of the input signal,
a second capacitor that has a first end connected to an output of the switching amplifier and a second end connected to an output of the linear amplifier, and
a switch circuit configured to connect the second end of the second capacitor to ground when the band width of the input signal is the second band width.

### Claim 11 (depends on 2)

The transmission unit according to claim 2, wherein when the band width of the input signal is the first band width, the bias circuit is configured to adjust, based on the second control signal, the bias current or the bias voltage such that the carrier amplifier and the peak amplifier operate at the same operation points.

### Claim 12 (depends on 11)

The transmission unit according to claim 11, wherein the combiner comprises:
a combining circuit that electrically connects an output of the carrier amplifier and an output of the peak amplifier at a node such that the the third signal and the fourth signal are combined at the node, and
a ¼ wavelength line that is serially connected between the output of the carrier amplifier and the node.

### Claim 13 (depends on 11)

The transmission unit according to claim 11, wherein the combiner comprises:
a combining circuit that electrically connects an output of the carrier amplifier and an output of the peak amplifier at a node such that the the third signal and the fourth signal are combined at the node, and
a ¼ wavelength line that is serially connected between the output of the carrier amplifier and the node.

### Claim 14 (depends on 11)

The transmission unit according to claim 11, wherein the combiner comprises:
a combining circuit that electrically connects an output of the carrier amplifier and an output of the peak amplifier at a node such that the third signal and the fourth signal are combined at the node,
an inductor that is serially connected between the output of the carrier amplifier and the node, and
a first capacitor that is serially connected between the output of the peak amplifier and the node, and
wherein the inductor delays a phase of the third signal by around 45° and advances a phase of the fourth signal by around 45°.

### Claim 15 (depends on 11)

The transmission unit according to claim 11, wherein the power supply circuit comprises:
a switching amplifier configured to step up or step down a prescribed voltage,
a linear amplifier configured to output the power supply voltage in accordance with the amplitude level of the input signal,
a second capacitor that has a first end connected to an output of the switching amplifier and a second end connected to an output of the linear amplifier, and
a switch circuit configured to connect the second end of the second capacitor to ground when the band width of the input signal is the second band width.

### Claim 16 (depends on 1)

The transmission unit according to claim 1, wherein the power supply circuit comprises:
a switching amplifier configured to step up or step down a prescribed voltage,
a linear amplifier configured to output the power supply voltage in accordance with the amplitude level of the input signal,
a second capacitor that has a first end connected to an output of the switching amplifier and a second end connected to an output of the linear amplifier, and
a switch circuit configured to connect the second end of the second capacitor to ground when the band width of the input signal is the second band width.

### Claim 17 (depends on 1)

The transmission unit according to claim 1, wherein based on the first control signal, the power supply circuit is configured to:
continuously vary the power supply voltage in conjunction with variations in the amplitude level of the input signal when the band width of the input signal is the first band width, and
discretely vary the power supply voltage in conjunction with variations in the amplitude level of the input signal when the band width of the input signal is a third band width,
wherein the third band width is larger than the first band width and smaller than the second band width.

### Claim 18 (depends on 17)

The transmission unit according to claim 17, wherein the power amplification circuit comprises:
a divider configured to divide the input signal into a first signal and a second signal,
a carrier amplifier configured to amplify the first signal and to output a third signal,
a peak amplifier configured to amplify the second signal and to output a fourth signal,
a combiner configured to combine the third signal and the fourth signal and to output the amplified signal, and
a bias circuit configured to supply a bias current or a bias voltage to the carrier amplifier and the peak amplifier based on a second control signal corresponding to the band width of the input signal, and
wherein when the band width of the input signal is the second band width or the third band width, the bias circuit is configured to adjust, based on the second control signal, the bias current or the bias voltage such that the carrier amplifier performs a class-A operation or a class-AB operation and the peak amplifier performs a class-C operation.

### Claim 19 (depends on 1)

The transmission unit according to claim 1, wherein when the band width of the input signal is the first band width, the power supply circuit is configured to, based on the first control signal, discretely vary the power supply voltage in conjunction with variations in the amplitude level of the input signal.

### Claim 20 (depends on 19)

The transmission unit according to claim 19, wherein the power amplification circuit comprises:
a divider configured to divide the input signal into a first signal and a second signal,
a carrier amplifier configured to amplify the first signal and to output a third signal,
a peak amplifier configured to amplify the second signal and to output a fourth signal,
a combiner configured to combine the third signal and the fourth signal and to output the amplified signal, and
a bias circuit configured to supply a bias current or a bias voltage to the carrier amplifier and the peak amplifier based on a second control signal corresponding to the band width of the input signal, and
wherein when the band width of the input signal is the first band width or the second band width, the bias circuit is configured to adjust, based on the second control signal, the bias current or the bias voltage such that the carrier amplifier performs a class-A operation or a class-AB operation and the peak amplifier performs a class-C operation.