Class e power amplifiers for qrp2 qro

Class-E Power Amplifiers for QRP to QRO ,[object Object],[object Object],[object Object]

QRP is all about efficiency… ,[object Object],… transmitting the least amount of power necessary for a QSO… … so why waste power with an inefficient PA?

QRO operators can't ignore efficiency either… 50 kW RF @ 50% efficiency = $240/day 50 kW RF @ 90% efficiency = $133/day SAVINGS = 1 full-time staff salary.

Why is PA efficiency important? ,[object Object],[object Object],[object Object]

Why is PA efficiency important? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is Class-E? ,[object Object],[object Object],[object Object]

Class-E Waveforms * * US3919656

Definition of Class-E Waveforms ,[object Object],[object Object],[object Object]

Where can Class-E transmitters be found? SGC Mini-Lini , 500W ‘linear’ 4SQRP NS-40 , 5W, 40M CW Transmitter Broadcast Electronics 1 – 5 KW AM BC Transmitter

WA1QIX 400W 75M Class E Amp www.classeradio.com

What devices are good for Class-E QRP transmitters? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How is a Class-E PA designed? ,[object Object],[object Object],[object Object]

Designing a Class-E PA A simple prototype circuit will suffice for most QRP applications.

Class-E Design Procedure ,[object Object],[object Object],[object Object],[object Object]

Class-E Design Procedure ,[object Object],[object Object]

Class-E Design Procedure ,[object Object],[object Object],[object Object]

Circuit Simulation and Optimization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Analytic Tools – SWCAD III* * www.linear.com

SWCAD III Time-Domain Analysis

Efficiency and Thermal Management ,[object Object],[object Object],[object Object]

Thermal Impedance ,[object Object],[object Object],[object Object],[object Object],[object Object]

How is the Class-E PA driven? ,[object Object],[object Object],[object Object]

Practical MOSFET Drive Circuitry ,[object Object],[object Object],[object Object],[object Object]

Practical Drive Circuit ,[object Object]

How do the Class-B and –E PAs compare? ,[object Object],[object Object],[object Object]

What happens to Class-B and Class-E power output at 2:1 VSWR?

Transistor Dissipation vs. VSWR

Peak Drain V vs. VSWR, Class-E

Class-E Harmonic Performance ,[object Object],A second harmonic notch is usually required to provide sufficient attenuation!

Class-E LINEAR Amplifier ,[object Object],[object Object],[object Object]

Strategies for Low Cost Design: ,[object Object],[object Object],[object Object],[object Object]

‘ Linear’ Amplification by Envelope Elimination and Restoration ,[object Object]

Component Choices ,[object Object],2N3055, 70% efficient ,[object Object]

Heat Sink Detail ,[object Object],[object Object]

Conclusions - ,[object Object],[object Object],[object Object],[object Object]

But… ,[object Object],[object Object],[object Object],[object Object]

Class-E Power Amplifiers for QRP ,[object Object]

Class e power amplifiers for qrp2 qro

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