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Design Example: Vintage Mixing Console01:17

Design Example: Vintage Mixing Console

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A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
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Design Example01:23

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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Design Example: Capacitance Multiplier Circuit01:20

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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Impedance Combination01:21

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Design of Ultra-Wideband Doherty Power Amplifier Using a Modified Combiner Integrated with Complex Combining

Jian Chen1, Zhihui Liu1, Tao Dong1

  • 1Space Star Technology Co., Ltd., Beijing 100086, China.

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|April 28, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel ultra-wideband Doherty power amplifier (DPA) design using a modified combiner and complex impedance. The new method offers greater design flexibility for future wireless systems.

Keywords:
Doherty power amplifiercomplex combinermodified combinerultra-wideband

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Area of Science:

  • Electrical Engineering
  • Microwave Engineering
  • Wireless Communication

Background:

  • Future wireless communication systems require extended bandwidth capabilities.
  • Doherty power amplifiers (DPAs) are crucial components in these systems but often face bandwidth limitations.

Purpose of the Study:

  • To develop an ultra-wideband Doherty power amplifier (DPA).
  • To enhance design flexibility for power amplifier (PA) designers targeting wideband applications.

Main Methods:

  • Utilized a modified combiner integrated with complex combining impedance.
  • Conducted a comprehensive analysis of the proposed design methodology.
  • Designed, fabricated, and measured a DPA prototype operating from 1.2 to 2.8 GHz.

Main Results:

  • Achieved a relative bandwidth of 80% (1.2-2.8 GHz).
  • Delivered a saturation output power of 43.2-44.7 dBm with a gain of 5.2-8.6 dB.
  • Obtained a saturation drain efficiency (DE) of 44.3-70.4% and a 6 dB back-off DE of 38.7-57.6%.

Conclusions:

  • The proposed design methodology enables greater freedom for PA designers in creating ultra-wideband DPAs.
  • The fabricated DPA demonstrates effective performance over an ultra-wide frequency range.
  • This approach is compatible with the demands of next-generation wireless communication systems.