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TR8100

916.50 MHz Hybrid Transceiver

Murata Manufacturing 

ASH Transceiver Theory of Operation

Introduction

RFM’s amplifier-sequenced hybrid (ASH) transceiver technology is

specifically designed for short-range wireless data communication

applications. ASH transceivers provide robust operation, very

small size, low power consumption and low implementation cost.

All critical RF functions are contained in the hybrid, simplifying and

speed-ing design-in. ASH transceivers can be readily configured to

support a wide range of data rates and protocol requirements.

These transceivers feature excellent suppression of transmitter

harmonics and virtually no RF emissions when receiving, making

them easy to certify to short-range (unlicensed) radio regulations.

Amplifier-Sequenced Receiver Operation

The ASH transceiver’s unique feature set is made possible by its

system architecture. The heart of the transceiver is the amplifier-

sequenced receiver section, which provides more than 100 dB of

stable RF and detector gain without any special shielding or

decoupling requirements.

Figure 1 shows the basic block diagram and timing cycle for an

amplifier sequenced receiver. Note that the bias to RF amplifiers

RFA1 and RFA2 are independently controlled by a pulse

generator, and that the two amplifiers are coupled by a surface

acoustic wave (SAW) delay line, which has a typical delay of

0.5 µs.

An incoming RF signal is first filtered by a narrow-band SAW filter,

and is then applied to RFA1. The pulse generator turns RFA1 ON

for 0.814 µs. The amplified signal from RFA1 emerges from the

SAW delay line at the input to RFA2. RFA1 is now switched OFF

and RFA2 is switched ON for 0.814 µs, amplifying the RF signal

further. The ON time for RFA1 and RFA2 is set by a 614 kHz

internal pulse generator. As shown in the timing diagram, RFA1

and RFA2 are never on at the same time, assuring excellent

receiver stability. Note that the narrow-band SAW filter eliminates

sampling sideband responses outside of the receiver passband,

and the SAW filter and delay line act together to provide very high

receiver ultimate rejection.

ASH Transceiver Block Diagram

Figure 2 is the general block diagram of the ASH transceiver.

Please refer to Figure 2 for the following discussions.

Antenna Port

The only external RF components needed for the transceiver are

the antenna and its matching components. Antennas presenting

an impedance in the range of 35 to 72 ohms resistive can be

satisfactorily matched to the RFIO pin with a series matching coil

and a shunt matching/ESD protection coil. Other antenna

impedances can be matched using two or three components. For

some impedances, two inductors and a capacitor will be required.

A DC path from RFIO to ground is required for ESD protection.

ASH Receiver Block Diagram & Timing Cycle

Antenna

SAW Filter

RFA1

P1

SAW

Delay Line

Pulse

Generator

RFA2

P2

Detector &

Low-Pass

Filter

Data

Out

RF Input

tPW1

P1

RFA1 Out

tPRI

tPRC

Delay Line

Out

tPW2

P2

RF Data Pulse

Figure 1

©2010-2015 by Murata Electronics N.A., Inc.

TR8100 (R) 4/24/15

Page 4 of 15

www.murata.com

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