In the past, power amplifier blocks for UHF broadcast were straightforward to design. In most cases the requirement was a class AB broadband amplifier covering 470-860 MHz. A pallet approach (two transistors in balanced mode) was the most common implementation. Key parameters for this pallet are power (> 200 Wavg DVB-T), efficiency and linearity. Nowadays almost all new UHF transmitters make use of Doherty amplifiers. In recent years, new Doherty architectures have been developed which offer more efficiency and more bandwidth.
In this paper a brief discussion will be given to explain these new Doherty architectures and to help customers finding the best solution for their transmitter. Ampleon’s transistor family BLF8xx can support these Doherty architectures. Solutions with GaN technology will not be discussed.
Stay updated with the RF & Microwave Industry.
By signing up for our newsletter you agree to our Terms of Service and acknowledge receipt of our Privacy Policy.
By creating an account with us you agree to our Terms of Service and acknowledge receipt of our Privacy Policy.
Content submitted here will be sent to our editorial team who will review and consider it for publication on the website. you will be emailed if this content is published on everything RF.
Please click on the button in the email to get access to this section.