Low Power FSK Receiver for 315/433/868/915MHz ISM Band
Date Issued
2010
Date
2010
Author(s)
Tsou, Chen
Abstract
This thesis presents a receiver implemented in 0.35 um CMOS technology
suitable for low data rate, low power, low cost wireless sensor networks. The receiver
operates in the license-free ISM frequency bands at 315, 433, 868, or 915MHz and
supports FSK modulation data formats. The proposed receiver adopts low-IF
architecture in order to achieve low power consumption and high performance with
small chip area. In addition, the receiver uses a balun LNA to realize a fully
differential structure to suppress supply noise and substrate noise.
The building blocks of receiver include a low-noise amplifier, mixer, polyphase
filter, and DLL-based demodulator. Low power circuit design techniques are employed:
parallel combination at LNA input stage to relax matching requirement, current reuse,
and current bleeding. Also, a DLL-based demodulator without harmonic distortion
further reduces power consumption in the baseband block. The RF front-end circuit
provide 13dB voltage gain and wide band input matching from 315~915MHz with
15mW power consumption, while the baseband circuits dissipate 6mW. In sum,
receiver circuit achieves a sensitivity of -65dBm ~ -63dBm at 0.1 % BER with 50 kbps
data rate. The receiver total chip area is 2.5 mm2 and consumes 20.9mW.
Subjects
receiver
FSK
low-noise amplifier
mixer
DLL-based demodulator
Type
thesis
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