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SX1231
WIRELESS & SENSING PRODUCTS
DATASHEET
3.5. Receiver Description
The SX1231 features a digital receiver with the analog to digital conversion process being performed directly following the
LNA-Mixers block. The zero-IF receiver is able to handle (G)FSK and (G)MSK modulation. ASK and OOK modulation is,
however, demodulated by a low-IF architecture. All the filtering, demodulation, gain control, synchronization and packet
handling is performed digitally, which allows a very wide range of bit rates and frequency deviations to be selected. The
receiver is also capable of automatic gain calibration in order to improve precision on RSSI measurements.
3.5.1. Block Diagram
Rx Calibration
Reference
LNA
Single to
Differential
Σ/Δ
Mixers Modulators
Channel
Filter
DC
Cancellation
Complex
Filter
CORDIC
Phase
FSK
RFIO
Output
Demodulator
From
PA1
Module
Output
RSSI
OOK
Demodulator
Bypassed
Local
Oscillator
AFC
in FSK
AGC
Figure 7. Receiver Block Diagram
The following sections give a brief description of each of the receiver blocks.
3.5.2. LNA - Single to Differential Buffer
The LNA uses a common-gate topology, which allows for a flat characteristic over the whole frequency range. It is
designed to have an input impedance of 50 Ohms or 200 Ohms (as selected with bit LnaZin in RegLna) , and the parasitic
capacitance at the LNA input port is cancelled with the external RF choke. A single to differential buffer is implemented to
improve the second order linearity of the receiver.
The LNA gain, including the single-to-differential buffer, is programmable over a 48 dB dynamic range, and control is either
manual or automatic with the embedded AGC function.
Note
In the specific case where the LNA gain is manually set by the user, the receiver will not be able to properly handle
FSK signals with a modulation index smaller than 2 at an input power greater than the 1dB compression point,
tabulated in section 3.5.3.
Table 11 LNA Gain Settings
Rev. 7 - June 2013
LnaGainSelect
000
001
010
011
100
101
110
111
LNA Gain
Any of the below, set by the AGC loop
Max gain
Max gain - 6 dB
Max gain - 12 dB
Max gain - 24 dB
Max gain - 36 dB
Max gain - 48 dB
Reserved
Page 25
Gain Setting
-
G1
G2
G3
G4
G5
G6
-
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