Operating Instructions

SENSE MCE IBC Operating Instruction

Rev. D, 2020-12-15 Release Page 37 of 46

5.5 ISM Sub-1GHz Band

For the ISM Sub 1-GHz band signal generation and transmission, a low-power, high-

performance RF Transceiver from Texas Instruments (CC1200) is used. The transmitted and

the received signals are amplified with an RF Front End also from Texas Instruments, which

can be operated at 850 – 950 MHz (CC1190).

To get an increased ISM maximum output power of 23 dBm, a transmitted power level of -1.5

dBm is amplified with an analog front end in the output amplifier stage. With a gain of 24.5 dB

(High Gain Mode) and a noise figure of 2.9 dB the maximum power level is achieved in

consideration of the board losses (approximately 1.1 dB). This is the gain going out of the

Power Amplifier without calculating the peak gain of the printed antenna of peak gain of 0 dBi

(average gain of the printed antenna -6 dBi).

Table 9 shows the transmit power levels, receiver sensitivity and current consumption for each

used frequency at 915 MHz.

Table 9: RF specifications and current consumption

Parameter

Min

Typ.

Max

Unit

Conditions

Transmit Power

dBm

Receiver

Sensitivity

-115

dBm

100-kbps 2-GFSK, DEV=175 kHz,

CHF=514.423 kHz

Current

Consumption

220

Output power of 23 dBm

Current

Consumption

160

Output power of 16 dBm

GFSK is short for the frequency modulation Gaussian Frequency Shift Keying, DEV is short for deviation, CHF is short for

Channel Filter Bandwidth