Patent ID: 7672714

Claim:
A miniature wireless apparatus for collecting physiological signals comprising: a first circuit board having an upper surface and a bottom surface; a second circuit board having an upper surface and a bottom surface; a third circuit board having an upper surface and a bottom surface, said second circuit board being positioned between said first circuit board and said third circuit board; an electrode pair disposed on said bottom of said third circuit board, said electrode pair comprising a positive electrode, said electrode pair suitable for connection to a person so as to collect a pair of the physiological signals; an amplifier module disposed on said upper surface of said second circuit board, said amplifier module suitable for amplifying the pair of physiological signals, said amplifier module having analog circuits therein; a microcontroller disposed on said upper surface of said first circuit board, said microcontroller suitable for performing an analog-to-digital conversion and a data compression for the amplified physiological signals generated by said amplifier module; a wireless module disposed on said upper surface of said first circuit board, said wireless module suitable for modulating the digital physiological signals generated by microcontroller and for transmitting the modulated digital physiological signals to a receiver; a battery disposed between said bottom surface of said second circuit board and said upper surface of said third circuit board, said battery having a positive pole and a negative pole; and an isolated ground plane formed on said bottom surface of said first circuit board, said isolated ground plane suitable for increasing a signal-to-noise ratio of said analog circuits of said amplifier module.