RF63 datasheet(29/91 Pages) ETC2

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ADVANCED COMMUNICATIONS & SENSING

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RF63

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RSSI

(dB)

„‟Peak -6dB‟‟ Threshold

„‟Floor‟‟ threshold defined by

MCParam_OOK_floor_thresh

Noise floor of

receiver

Time

Zoom

Decay in dB as defined in

RXPAram_OOK_thresh_step

Fixed 6dB difference

Period as defined in

RXParam_OOK_thresh_dec_period

Figure 22: OOK Demodulator Description

In peak threshold mode the comparison threshold level is the peak value of the RSSI, reduced by 6dB. In the

absence of an input signal or during the reception of a logical

“0”, the acquired peak value is decremented by one

RXPAram_OOK_thresh_step every RXParam_OOK_thresh_dec_period.

When the RSSI output is null for a long time (for instance after a long string of

“0” received, or if no transmitter is

present), the peak threshold level will continue falling until it reaches the

“Floor Threshold” that is programmed

through the register MCParam_OOK_floor_thresh.

The default settings of the OOK demodulator lead to the performance stated in the electrical specification.

However, in applications in which sudden signal drops are awaited during a reception, the three parameters shall

be optimized accordingly.

3.4.10.1. Optimizing the Floor Threshold

MCParam_OOK_floor_thres determines the sensitivity of the OOK receiver, as it sets the comparison threshold for

weak input signals (i.e. those close to the noise floor). Significant sensitivity improvements can be generated if

configured correctly.

Note that the noise floor of the receiver at the demodulator input depends on:

•

The noise figure of the receiver.

•

The gain of the receive chain from antenna to base band.

•

The matching - including SAW filter.

•

The bandwidth of the channel filters.

It is therefore important to note that the setting of MCParam_OOK_floor_thresh will be application dependant. The

following procedure is recommended to optimize MCParam_OOK_floor_thresh.

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