# US 2014/0152389 A1 · Actively Tuned Circuit Having Parallel Carrier and Peaking Paths

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- Number: US 2014/0152389 A1
- Document ID: US20140152389A1
- Status: Published application
- Kind: A1
- Application number: 13/504,978
- Filed: 2011-07-25
- Published: 2014-06-05
- Earliest claimed: 2011-07-25
- Assignees: Andrew Corporation
- Inventors: Simon H. Hamparian
- Web page: https://patentgrep.com/patent/US20140152389A1

## CPC

- H03F 3/68: Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics {(power amplifiers using a combination of several semiconductor amplifiers H03F3/211; combinations of amplifiers using coupling networks with distributed constants H03F3/602)}
- 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}
- H03F 1/32: Modifications of amplifiers to reduce non-linear distortion (by negative feedback H03F1/34)
- H03F 1/565: {using inductive elements}
- H03F 3/211: {using a combination of several amplifiers (H03F3/60 takes precedence)}
- H03F 3/602: {Combinations of several amplifiers}
- H03F 2200/198: A hybrid coupler being used as coupling circuit between stages of an amplifier circuit
- H03F: AMPLIFIERS

## Abstract

A (e.g., Doherty) circuit with carrier and peaking amplifier paths, has an independently controlled, variable phase shifter in each of those signal processing paths that is controlled to compensate for distortion resulting from operating at frequencies that are relatively far from the optimal (e.g., center) frequency of the circuit's operating bandwidth.

## Claims

### Claim 1

A circuit (e.g., 400) comprising:
a power splitter (e.g., 410) configured to split an input signal (e.g., 405) into first and second signals;
a carrier amplifier path (e.g., 420) configured to receive the first signal from the power splitter, the carrier amplifier path comprising a first variable phase shifter (e.g., 421) in series with a carrier amplifier (e.g., 423), wherein:
the first variable phase shifter applies a first phase shift to the first signal; and
the carrier amplifier amplifies the first signal;
a peaking amplifier path configured to receive the second signal from the power splitter, the peaking amplifier path comprising a second variable phase shifter (e.g., 431) in series with a peaking amplifier (e.g., 434), wherein:
the second variable phase shifter applies a second phase shift to the second signal; and
the peaking amplifier amplifies the second signal;
a power combiner (e.g., 440) configured to combine signals generated by the carrier and peaking amplifier paths to provide an output signal; and
control circuitry (e.g., 460) configured to control the first and second phase shifts applied by the first and second phase shifters to the first and second signals, respectively.

### Claim 2 (depends on 1)

The invention of claim 1, wherein the circuit is a Doherty circuit.

### Claim 3 (depends on 1)

The invention of claim 1, wherein the control circuitry independently controls the first and second phase shifters.

### Claim 4 (depends on 1)

The invention of claim 1, wherein the control circuitry is configured to control the first and second phase shifters based on a feedback signal tapped from the output signal.

### Claim 5 (depends on 1)

The invention of claim 1, wherein:
the circuit is a Doherty circuit;
the control circuitry independently controls the first and second phase shifters; and the control circuitry is configured to control the first and second phase shifters based on a feedback signal tapped from the output signal.