Amplifier devices with input line termination circuits

• US 10,270,397 B2
• Filed: 09/08/2017
• Issued: 04/23/2019
• Est. Priority Date: 10/24/2016
• Status: Active Grant

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Inventors: Blednov, Igor
• Primary Examiner(s): Choe, Henry
• Application Number:
  US15/698,916
• Publication Number:
  US 20180115284A1
• Time in Patent Office: 592 Days
• Field of Search: 330295, 330124 R
• CPC Class Codes: H03F 1/0205 in transistor amplifiers
• CPC Class Codes: H03F 1/0288 using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
• CPC Class Codes: H03F 1/32 Modifications of amplifiers to reduce non-linear distortion by negative feedback H03F1/34
• 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 2200/451 the amplifier being a radio frequency amplifier
• CPC Class Codes: H03F 3/19 with semiconductor devices only
• CPC Class Codes: H03F 3/245 with semiconductor devices only
• CPC Class Codes: H03F 3/605 Distributed amplifiers
• CPC Class Codes: H03F 3/62 Two-way amplifiers

Abstract

The embodiments described herein provide wideband highly asymmetrical power efficient amplifier device that include a compact input power distribution network with input termination circuit. The input termination circuit is configured to provide control of the power distribution at the amplifier input. In one embodiment, the input termination circuit is configured to generate and reflect a frequency dependent portion of an input signal back toward the amplifier device inputs. This input reflection controls the input power distribution and shape of time domain input signal in a way that can affect amplifier device efficiency and linearity.

Claims

1. An amplifier device comprising:

a first amplifier, the first amplifier including a first amplifier input and a first amplifier output;

a second amplifier, the second amplifier including a second amplifier input and a second amplifier output;

a first input phase shifter of specific characteristic impedance coupled between the first amplifier input and the second amplifier input;

a first output phase shifter of specific characteristic impedance coupled between the first amplifier output and the second amplifier output; and

an input termination circuit coupled to the second amplifier input, the input termination circuit configured to reflect a frequency dependent portion of an input signal back toward the first amplifier input, wherein the input termination circuit comprises a non-linear impedance component implemented with one or more components selected from a transistor configured to operate in a non-linear VI region, one or more diodes, a varactor, a varistor, a Hall sensor, and a metal oxide semiconductor capacitor.

2. The amplifier device of claim 1, wherein the non-linear impedance component is variable dependent upon at least one of a voltage or current applied to the non-linear impedance component.

6. The amplifier device of claim 1, wherein the first input phase shifter is selected from a transmission line and a lumped element circuit configured to provide a transmission line equivalence.

3. An amplifier device comprising:

a first amplifier, the first amplifier including a first amplifier input and a first amplifier output;

a second amplifier, the second amplifier including a second amplifier input and a second amplifier output;

a first input phase shifter of specific characteristic impedance coupled between the first amplifier input and the second amplifier input;

a first output phase shifter of specific characteristic impedance coupled between the first amplifier output and the second amplifier output; and

an input termination circuit coupled to the second amplifier input, the input termination circuit configured to reflect a frequency dependent portion of an input signal back toward the first amplifier input, wherein the input termination circuit comprises a controllable impedance component coupled to the second amplifier input, where the controllable impedance component is adapted to be variable responsive to a characteristic selected from an input voltage applied to the amplifier device, an input current applied to the amplifier device, and a frequency of an input signal applied to the amplifier device.

4. The amplifier device of claim 3, wherein the controllable impedance component is implemented with a controllable voltage limiter coupled to the second amplifier input.

5. The amplifier device of claim 3, wherein the input termination circuit is controllable via a microcontroller.

7. An amplifier device comprising:

a first amplifier, the first amplifier including a first amplifier input and a first amplifier output;

a second amplifier, the second amplifier including a second amplifier input and a second amplifier output;

a first input phase shifter of specific characteristic impedance coupled between the first amplifier input and the second amplifier input;

a first output phase shifter of specific characteristic impedance coupled between the first amplifier output and the second amplifier output;

an input termination circuit coupled to the second amplifier input, the input termination circuit configured to reflect a frequency dependent portion of an input signal back toward the first amplifier input;

a carrier amplifier, the carrier amplifier including a carrier amplifier input and a carrier amplifier output;

a second input phase shifter of specific characteristic impedance coupled between the carrier amplifier input and the first amplifier input; and

a second output phase shifter of specific characteristic impedance coupled between the carrier amplifier output and the first amplifier output.

8. The amplifier device of claim 7, further comprising:

an asymmetrical input splitter, the asymmetrical input splitter having an input, a first output, and a second output, the input coupled to an RF signal source, the first output coupled to the carrier amplifier input, and the second output coupled to the second input phase shifter.

9. The amplifier device of claim 8, further comprising at least one of a resistive element, inductance and capacitance coupled between the first output and the second output.

10. The amplifier device of claim 8, wherein the asymmetrical input splitter comprises a Wilkinson power splitter.