A microwave radio for Doppler radar sensing of vital signs is described. This radio was developed using custom DCS1800/PCS1900 base station RFICs. It transmits a single tone signal, demodulates the reflected signal, and outputs a baseband signal. If the object that reflects the signal has periodic motion, the magnitude of the baseband output signal is directly proportional to the periodic displacement of the object. When the signal is reflected off a person's chest, this radio with appropriate baseband filters can detect heart and respiration rates from a distance as large as one meter from the target.

A microwave radio for Doppler radar sensing of vital signs

A fully integrated direct conversion Doppler radar that detects heart and respiration movement at a distance of 50 cm is described. The 1.6 GHz transceiver is implemented in both CMOS and BiCMOS technologies, with each chip occupying 14 mm/sup 2/ using a 0.25 μm silicon processes. The effects on system sensitivity of phase noise at small offset frequencies with range correlation are assessed.

0.25 /spl mu/m CMOS and BiCMOS single-chip direct-conversion Doppler radars for remote sensing of vital signs

A snapshot of the state of health and social care.

of Vital Signs

Design and chip fabrication results for complementary RF circuit topologies that utilize the complementary RF characteristics of both NMOS and PMOS field-effect-transistor devices combined in parallel way are reported, which can inherently provide single-ended differential signal-processing capability, requiring neither baluns, nor differential signal generating/combining circuits. The proposed complementary CMOS parallel push-pull (CCPP) amplifier gives an order of magnitude improvement in IP/sub 2/ than an NMOS common-source amplifier and single-balanced CCPP resistive mixer, which functions effectively as a double-balanced one, provides more than an order of magnitude better linearity in IP/sub 2/, and similar order of magnitude better local oscillator (LO)-IF and LO-RF isolations than NMOS counterparts.

CMOS RF amplifier and mixer circuits utilizing complementary Characteristics of parallel combined NMOS and PMOS devices

A quadrature direct conversion microwave Doppler radar has been fully integrated in 0.25 /spl mu/m CMOS. This ISM band radar chip has been used to detect heart and respiration movement 50 cm from the subject. While oscillator phase noise is a performance-limiting factor in CW radar systems, the range correlation effect enables measurement of small phase modulations in spite of the notoriously high phase noise of the on-chip CMOS oscillator. This is the first reported quantitative experimental verification of the range correlation effect.

Range correlation effect on ISM band I/Q CMOS radar for non-contact vital signs sensing

This paper describes two CMOS resistive ring mixer MMICs for GSM 900 and DCS 1800 base station applications. These mixers have the lowest measured conversion loss (5.5 dB, 5.8 dB) and highest associated input IP3 (19.4 dBm, 19.5 dBm) published to date for passive CMOS mixer MMICs in these frequency bands.

C. Zelley

Papers

A CMOS resistive ring mixer MMICs for GSM 900 and DCS 1800 base station applications