A Current-Mode Filter for Analog Front End of Power Line Communication
In this paper a 6th 1 MHz~30 MHz bandpass filter for power line communication (PLC) modem receiver is designed by using current mode synthesis method which is good to design the low-voltage and low-power filter. The designed bandpass filter is composed of cascade connection between 3rd Butterworth highpass filter and 3rd Chebychev lowpass filter. As a core circuit in the current-mode filter, a current-mode integrator is designed with new architecture which can improve gain and unity gain frequency of the integrator. The gain and the unity gain frequency of the designed integrator is each 32.2 dB and 247 MHz. And the cutoff frequency of the designed 6th bandpass filter can be controlled to 50 MHz from 200 kHz according to controlling voltage and the power consumption is 2.85 mW with 1.8 V, Vdd. The designed bandpass filter was verified using a 0.18μm CMOS parameter.
KeywordsCurrent-mode integrator Current-mode filter Low-power filter Analog front end Power line communication
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