Switching amplifier and transmitter using same

Patent metadata

Field	Value
Publication number	US-9520847-B2
Application number	US-201314398299-A
Country	US
Kind code	B2
Filing date	Apr 5, 2013
Priority date	May 25, 2012
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

The present invention is applied to a switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together, and a high-side driver and a low-side driver that drive the first high-side gate and the first low-side gate, respectively. In the switching amplifier of the present invention, the high-side driver includes an input switching amplifier that uses the output terminal of the first high-side gate as a power source.

First claim

What is claimed is:

1. A switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together and a high-side driver and low-side driver that drive said first high-side gate and said first low-side gate, respectively, wherein:
said high-side driver includes an input switching amplifier that uses an output terminal of said first high-side gate as a power source; and
said high-side driver further includes a relay amplifier having an input terminal connected to an output terminal of said input switching amplifier and an output terminal connected to an input terminal of said first high-side gate.

2. The switching amplifier as set forth in claim 1 , wherein said relay amplifier is an inverter series in which a plurality of inverters are cascade-connected.

3. The switching amplifier as set forth in claim 1 , wherein said high-side driver further comprises:
a diode having its anode terminal connected to the ground terminal of said relay amplifier and its cathode terminal connected to the output terminal of said input switching amplifier; and
a capacitor having one terminal connected to the ground terminal of said relay amplifier and the other terminal connected to the output terminal of said first high-side gate.

4. The switching amplifier as set forth in claim 1 , wherein a power-source terminal and ground terminal of said relay amplifier are each connected to a respective output terminal of the two output terminals of a DC-DC converter.

5. The switching amplifier as set forth in claim 4 , wherein said high-side driver further includes a diode having its anode terminal connected to a ground terminal of said relay amplifier and its cathode terminal connected to an output terminal of said input switching amplifier.

6. The switching amplifier as set forth in claim 1 , wherein said input switching amplifier includes a resistor and an internal amplifier element, and said resistor is connected between the output terminal of said first high-side gate and the output terminal of said internal amplifier element.

7. The switching amplifier as set forth in claim 1 , comprising a plurality of sets of said first high-side gate and said high-side driver.

8. A transmitter that uses the switching amplifier as set forth in claim 1 .

9. A switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together and a high-side driver and low-side driver that drive said first high-side gate and said first low-side gate, respectively, wherein:
said high-side driver includes an input switching amplifier that uses an output terminal of said first high-side gate as a power source;
wherein said input switching amplifier includes a resistor and an internal amplifier element, and said resistor is connected between the output terminal of said first high-side gate and the output terminal of said internal amplifier element; and
said input switching amplifier further includes an inductor, and said inductor is connected in a series with said resistor.

10. A switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together and a high-side driver and low-side driver that drive said first high-side gate and said first low-side gate, respectively, wherein:
said high-side driver includes an input switching amplifier that uses an output terminal of said first high-side gate as a power source; and
said first high-side gate, said first low-side gate, said high-side driver, and said low-side driver form a first buffer circuit; the switching amplifier further comprising:
a second high-side gate having an input terminal connected to an output terminal of said first buffer circuit; and
a second low-side gate;
wherein said second high-side gate and said second low-side gate have output terminals that are connected together.

11. The switching amplifier as set forth in claim 10 , comprising a plurality of sets of said second high-side gate and said first buffer circuit.

12. A switching amplifier that includes a first high-side gate and a first low-side gate having output terminals connected together and a high-side driver and low-side driver that drive said first high-side gate and said first low-side gate, respectively, wherein:
said high-side driver includes an input switching amplifier that uses an output terminal of said first high-side gate as a power source; the switching amplifier further comprising:
two sets, each set being made up by said first high-side gate, said first low-side gate, said high-side driver, and said low-side driver, one set forming a first buffer circuit and the other set forming a second buffer circuit;
a second high-side gate having an input terminal connected to an output terminal of said first buffer circuit; and
a second low-side gate having an input terminal connected to an output terminal of said second buffer circuit;
wherein said second high-side gate and said second low-side gate have output terminals that are connected together.

Assignees

• Nec Corp

Inventors

• Hori Shinichi

Classifications

• H03K17/687

  the devices being field-effect transistors · CPC title

• H03F2200/336

  A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit · CPC title

• H03F1/0244

  Stepped control · CPC title

• H03F2200/171

  A filter circuit coupled to the output of an amplifier · CPC title

• H03F3/193

  with field-effect devices (H03F3/195 takes precedence) · CPC title