RXM-418-LR_【PDF 14/40 页】RECEIVER 418MHZ LR SERIES

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Theory of Operation

The LR receiver is designed to

recover data sent by an AM or

Carrier-Present Carrier-Absent

Data

(CPCA) transmitter, also referred to

as CW or On-Off Keying (OOK). This

type of modulation represents a logic Carrier

low ‘0’ by the absence of a carrier

and a logic high ‘1’ by the presence

Figure 13: CPCA (AM) Modulation

of a carrier. This modulation method affords numerous benefits. The two

most important are: 1) cost-effectiveness due to design simplicity and 2)

higher allowable output power and thus greater range in countries (such as

the U.S.) that average output power measurements over time. Please refer

to Linx Application Note AN-00130 for a further discussion of modulation

techniques.

The LR receiver utilizes an advanced single-conversion superheterodyne

architecture. Transmitted signals enter the module through a 50 Ω RF port

intended for single-ended connection to an external antenna. RF signals

entering the antenna are filtered and then amplified by an NMOS cascode

Low Noise Amplifier (LNA). The filtered, amplified signal is then down-

converted to a 10.7MHz Intermediate Frequency (IF) by mixing it with a

low-side Local Oscillator (LO). The LO frequency is generated by a Voltage

Controlled Oscillator (VCO) locked by a Phase-Locked Loop (PLL) frequen-

cy synthesizer that utilizes a precision crystal reference. The mixer stage

incorporates a pair of double-balanced mixers and a unique image rejection

circuit. This circuit, along with the high IF frequency and ceramic IF filters,

reduces susceptibility to interference. The IF frequency is further amplified,

filtered, and demodulated to recover the baseband signal originally trans-

mitted. The baseband signal is squared by a data slicer and output to the

DATA pin. The architecture and quality of the components utilized in the LR

module enable it to outperform many far more expensive receiver products.

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