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| 型號(hào)： | SL6609A |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 1/5頁 |
| 文件大?。?/td> | 37K |
| 代理商： | SL6609A |
AN197 -1.9 Janaury 1995
AN197
Performance Measurements on the SL6609A/SL6610
Application Note
INTRODUCTION
The objectives of this application note are to:
G
Aid understanding of the receiver measurements as
listed in the datasheets for SL6609A and SL6610.
G
Assist users of the SL6609A/SL6610 demonstration
boards when replicating the receiver measurements.
The characterisation analysis performed by Mitel was
on a large scale and in order to reduce the time required for
analysis a bit error rate (BER) meter under IEEE control was
used. This differs from the descriptions below which suggest
the use of a POCSAG encoder and decoder. A BER of 1 in 30
has been found to be equilvalent to a successful call reception
rate of 80% with a POCSAG encoder and decoder.
A test set-up as shown in Fig.1 is recommended. A
POCSAG Encoder generates address data that matches the
address of the decoder and is at the chosen baud rate (i.e. 512,
1200 or 2400). The data is FM modulated onto an RF Carrier
and applied to the demonstration board via the combiner. The
detected data output from Pin 14 is passed to the decoder to
acknowledge successful call detection by the SL6609A/
SL6610. Signal Generators B and C provide the interfering
signals required in some measurements.
For all measurements the local oscillator frequency
must be the same as the nominal RF carrier frequency used.
SENSITIVITY
Definition
The Sensitivity is the minimum power that is sufficient
to produce successful call reception at the defined rate of 80%.
It is a measure of the lowest signal strength the SL6609A/
SL6610 is capable of working with.
Measurement
Signal Generator A is programmed to provide an RF
signal equal to the nominal frequency of the demonstration
board (usually around 153MHz, 282MHz or 470MHz).
Address data from the POCSAG Encoder is DC FM
modulated onto the RF signal from Signal Generator A (i.e.
external modulation) with a 4.5kHz
F for 512 baud or 4kHz
F for 1200 baud.
The level of the RF Carrier from Signal Generator A is
repeatedly reduced while monitoring the ability of the
SL6609A/SL6610 to successfully detect the address data on
the RF Carrier.
Note: Signal Generators B and C are not used for this
measurement.
The Sensitivity as recorded is the minimum RF Carrier
level at the input to the Low Noise Amplifier of the
demonstration board which permits the 80% rate of successful
data detection to be maintained. The value is used as the
Reference Sensitivity Threshold for subsequent
measurements.
ADJACENT CHANNEL REJECTION
Definition
The Adjacent Channel Rejection measurement
establishes the capability of the SL6609A/SL6610 to operate
at the 80% rate of successful call detection when there is an
unwanted modulated interfering signal which differs from the
wanted signal by a single channel spacing (i.e. 25kHz).
Measurement
The RF Carrier from Signal Generator A remains at the
nominal frequency of the demonstration board but has the
level adjusted to the Reference Sensitivity Threshold plus
3dB. This is known as the wanted signal.
Signal Generator B provides the interfering signal and
is set to a frequency one channel spacing (i.e. 25kHz) below
the RF Carrier and has sinusoidal FM modulation of 400Hz at
3kHz
F generated internally.
The level of the interfering signal is adjusted to reach
the maximum at which the 80% rate of successful call
detection can be maintained.
Note: Signal Generator C is not used for this measurement.
The recorded Adjacent Channel Rejection is the
difference in dBs between the wanted and interfering signal
levels i.e. the difference between the Reference Sensitivity
Threshold plus 3dB and the interfering signal level at the RF
signal input to the Low Noise Amplifier.
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