Multi-Protocol, Multiband PA Development

Raj Rayit, SARAS Technology Ltd

Leeds

• Registered in England & Wales

• Based in Leeds, with easy access

to Motorways, Railway & Airport

• Design & Manufacture in the UK:

No ITAR Issues

• Accreditation to ISO 9001:2008

• Highly experienced Engineering

and Management team.

Company Background

Windmill House opened by

Lord Green in June 2013

• 3000+ sq ft modern facility with options for

further 3000 sq ft.

• Current headcount is 15

• In house Services • Design and Development

• PCB design and layout

• Board Assembly and Integration

• Test and Alignment

• Outsourced Services • CNC Machining (local and offshore)

• PCB Manufacture

• PCB Assembly (SMT)

SARAS Facility

• .. a 1W UHF PA for Radio MIC’s

• SPA001

• Still in Production

Our first ‘POWER’ amplifier

• Products and Markets

• Customers

• Acquire Knowledge and Expertise

• How to finance the development?

HPA challenges …

Multi Protocol PA Requirements

• Up to 80W (GSM) and 35W (UMTS, LTE) output capability

• Single unit with up to 3 bands

• Capable of handling GSM, UMTS and LTE

• Meets 3GPP linearity specifications etc

• Good efficiency

• Different variants with same footprint

• Only one band used at a time!

Design Goals

• Handle PAR up to ~9dB

• Use Doherty architecture to achieve good

efficiency

• Implement Linearisation at the outset

• Use commonality to minimise hardware

Block Schematic

RFIN

RF IN DIG ATT

CONTROL

CONTROL

SPDT

RFOUT

RFFB

DIG ATT

DIG ATT

RFIN RFOUT

RFFB

SPDT

SPDT

RFOUT

RFOUT

RFOUT

Hardware

Performance

Protocol Output Power

ACLR (dBc) Efficiency

GSM 80W N/A ~40%

UMTS/LTE 35W >47dBc ~30%

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SARAS Product Range

• Amplifier Products

• High Power and Linear PA’s

• Custom Designs including Broadband and Pulsed

• Cellular PA: GSM, UMTS, LTE, Multi-Mode

• Filter Products

• Filters

• Multiplexers: Diplexers, Triplexers…..

• Switched Filter Banks

• Passive Products

• Equaliser (Linear & Parabolic)

• Splitters and Combiners

• Integrated Products

• Custom Designed Assemblies

Filter Products

• VHF, UHF to 3GHz

• Surface Mount or Connectorised

Lumped Element and Ceramic Filters

Filter Products

• High Q, Low Loss

• High Power

• Rugged

• High Stopband Attenuation

Machined Combline Filters

Filter Products

• Low Loss (<1dB)

• High Rejection (60dB)

• 2 to 40 GHz

• Repeatable (Printed Technology)

• High Reliability

Suspended Substrate Filters

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Integrated Products • Switch Filter Banks

• Power Monitor Assembly

• COFDM Distribution System

• Frequency Multipliers