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| 型号： | DR-TRC103-915-EV |
| 厂商： | RFM |
| 文件页数： | 8/65页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 915MHZ RFM RFIC |
| 标准包装： | 1 |
| 类型： | 收发器，SRR |
| 频率： | 902MHz ~ 928MHz |
| 适用于相关产品： | TRC103-915 |
| 已供物品： | 2 个板，天线，电池 |
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OOK modulation is performed by switching on and off the power amplifier and its regulator. The rise and fall times
of the OOK signal can be configured in register MCFG0C_PA_ramp[4..3] , which controls the charge and dis-
charge time of the regulator. Figure 4 shows the time constants set by MCFG0C_PA_ramp[4..3]. Table 2 gives
typical values of the rise and fall times as defined in Figure 4 when the capacitance connected to the output of the
regulator is 0.047 μF.
O O K M o d u la tio n
W a v e fo rm s
D A T A
P o w e r A m p
R e g u la to r
9 5 %
R is e /F a ll
T im e s
R F E n v e lo p e
6 0 d B
R is e /F a ll
T im e s
Figure 4
2.3 Receiver
The TRC103 is set to receive mode when MCFG00_Chip_Mode[7..5] is set to 011. The receiver is based on a
double-conversion architecture. The front-end is composed of an LNA and a mixer whose gains are constant. The
mixer down-converts the RF signal to an intermediate frequency which is equal to 1/8 of the LO frequency, which
in turn is equal to 8/9 of the RF frequency. Behind this first mixer there is a variable gain IF amplifier that can be
programmed from maximum gain to 13.5 dB less in 4.5 dB steps with the MCFG01_IF_Gain[1..0] register.
After the variable gain IF amplifier, the signal is down-converted into two I and Q base-band signals by two quad-
rature mixers which are fed by reference signals at 1/8 the LO frequency. These I and Q signals are then filtered
and amplified before demodulation. The first filter is a second-order passive R-C filter whose bandwidth can be
programmed to 16 values with the register RXCFG10_LP_filt[7..4] . The second filter can be configured as either
a third-order Butterworth active filter which acts as a low-pass filter for the zero-IF FSK configuration, or as a pol-
yphase band-pass filter for the low-IF OOK configuration. To select Butterworth low-pass filter operation, bit
RXCFG12_PolyFilt_En[7] is set to 0. The bandwidth of the Butterworth filter can be programmed to 16 values
with the register RXCFG10_BW_Filt[3..0] . The low-IF configuration must be used for OOK modulation. This con-
figuration is enabled when the bit RXCFG12_PolyFilt_En[7] is set to 1. The center frequency of the polyphase
filter can be programmed to 16 values with the register RXCFG11_PolyFilt[7..4] . The bandwidth of the filter can
be programmed with the register RXCFG10_BW_Filt[3..0] . In OOK mode, the value of the low-IF is equal to the
deviation frequency defined in register MCFG02_Freq_dev . In addition to channel filtering, the function of the
polyphase filter is to reject the image. Figure 5 below shows the two configurations of the second IF filter. In the
Butterworth configuration, F CBW is the 3 dB cutoff frequency. In the polyphase band-pass configuration F OPP is the
center frequency given by RXCFG11_PolyFilt[7..4] , and F CPP is the upper 3 dB bandwidth of the filter whose off-
set, referenced to F OPP , is given by RXCFG10_BW_Filt[3..0].
www.RFM.com E-mail: info@rfm.com
? 2009-2010 by RF Monolithics, Inc.
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Page 8 of 65
TRC103 - 11/29/12
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