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Consumer-band BPSK 7.2 kbps PLM PICtail? Plus Daughter Board User’s Guide
2.1.1
Transmit Path
The daughter board utilizes four PWM channels to generate an approximated sine
wave. The PWM channels are shifted in phase such that a sum of their instantaneous
amplitude resembles a stepped sine wave. By filtering this stepped sine wave using a
band-pass filter, a relatively clean sine wave is obtained, as shown in Figure 2-2 . The
amount of filtering required is dependent on the number of PWM channels. Using
higher number of PWM channels will require less filtering.
FIGURE 2-2:
PWM-BASED ANALOG SIGNAL GENERATION
PWM1
PWM2
PWM3
PWM4
Band-pass
Filter
Output
After the approximated sine wave is obtained, it is amplified by the MCP6283 Op amp.
The Chip Select pin of this Op amp is used to implement flow-control. By asserting the
HiZ pin, the transmit amplifier is enabled, thus enabling the transmission path. This HiZ
pin can be configured on RG0/ RG1/RF0/RF1 using the jumper, JP2.
The output of this transmit amplifier is fed to the line driver circuit implemented using
transistors in a push-pull configuration. The line driver output is then coupled into the
power line through the HV adapter cable.
2.1.2
Receive Path
The modulated signal on the power line is received by the HV adapter cable and is
passed through an LC band-pass filter to filter out the noise and interference. This fil-
tered signal is then fed to the tuned amplifier, which is implemented using a transistor
amplifier in a common-emitter configuration. This amplified signal is then filtered using
a high-gain 2-stage active band-pass filter designed around the MCP6282 Op amp.
The output of this filter is then fed to the Analog-to-Digital Converter (ADC) input of the
dsPIC33F DSC device on the Explorer 16 Development Board. The ADC input pins,
AN8/AN9/AN16/AN17, can be selected by appropriately setting the jumper, JP3.
DS70656A-page 16
? 2011 Microchip Technology Inc.
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