A Low Power BAW Resonator Based 2.4-GHz Receiver With Bandwidth Tunable Channel Selection Filter at RF

• Published in: IEEE journal of solid-state circuits Vol. 48; no. 6; pp. 1343 - 1356
• Main Authors: Heragu, A., Ruffieux, D., Enz, C.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.06.2013; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acoustic wave devices, piezoelectric and piezoresistive devices; Analog decimator; Applied sciences; Bandwidth; BAW resonator; biomedical telemetry; Channels; Circuit properties; decimation; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Filtering; Filtration; FIR; Frequency filters; Hardware; IIR; Impedance; Input-output equipment; MEMS; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Mixers; Oscillators; Radio frequencies; Radio frequency; Receivers; Resonant frequency; Resonators; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; super-high IF; switched capacitor circuits; Tuning; wireless body area networks (WBAN); Phase noise; Acoustic wave device; Performance evaluation; BAW resonator; switched capacitor circuits; Acoustic wave; Bulk acoustic wave devices; Frequency synthesizer; decimation; User interface; Complementary MOS technology; Electric power consumption; Microwave receiver; MEMS; Sampling; wireless body area networks (WBAN); Acoustic wave resonator; Analog decimator; Low noise circuit; High Q factor; Q factor; Bulk wave; Reuse; Base band; FIR; biomedical telemetry; IIR; Tunable filter; Discrete time; super-high IF; Low-power electronics
• ISSN: 0018-9200; 1558-173X
• DOI: 10.1109/JSSC.2013.2253411

A low power sub-sampling multi-channel 2.4-GHz receiver front-end is presented. Bulk Acoustic Wave (BAW) resonators which intrinsically exhibit high quality factor (Q) are exploited in the frequency synthesis to provide low phase noise signal with low power consumption. A low power solution to perform channel selection and filtering directly at RF by employing current reuse and using a BAW resonator is proposed. The filter is capable of tuning the bandwidth and thus making the front-end to be suitable for multi-band/multi-standard applications. The overall performance of the front-end is improved by additional discrete time filtering which also down-converts the wanted channel to baseband in quadrature. The proposed front-end is designed and integrated in a 0.18-μm CMOS process. Measurements reveal that the front-end is capable of providing very narrow band filtering down to 300 kHz. The rejection at 10-MHz offset is 62 dB with conversion gain of 44.2 dB.