Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Patent
1996-12-19
1999-09-07
Pham, Chi H.
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
375320, 375322, 332102, 332105, H04L 2710
Patent
active
059498269
ABSTRACT:
A data transmission and reception system according to this invention comprises a transmitter for transmitting data by modulating transmit data and a receiver for receiving and demodulating a signal from the receiver, wherein the receiver includes a parallel resonator for receiving a PSK signal; a full rectification circuit for detecting output from the parallel resonator; a low pass filter for shaping the waveform of output from the full rectification circuit; and a comparator for converting output from the low pass filter into a binary-coded signal so that demodulated signals can be obtained from the output of the comparator. Therefore, PSK signals can be demodulated without a PLL or a tank circuit, the overall system consumes a smaller amount of power and is thin and reliable, the transmitter has an amplifier that can operate efficiently, particularly with a limited power supply as in IC cards or a single power supply used for portable terminals, and the receiver is reliable even with a simple circuit using a communication method that locally suppresses the amplitude at phase change points to remove an oscillation circuit in order to reduce the size and thickness of the device.
REFERENCES:
patent: 3764926 (1973-10-01), Rypinski, Jr.
patent: 4654880 (1987-03-01), Sontag
patent: 4893118 (1990-01-01), Lewiner et al.
patent: 5293400 (1994-03-01), Monrod et al.
patent: 5519729 (1996-05-01), Jurisch et al.
Arai Masayuki
Iiyama Keiichi
Takamiya Itsuo
Yamazaki Akihisa
Yokozeki Seiki
Bayard Emmanuel
Matsushita Electric - Industrial Co., Ltd.
Pham Chi H.
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