Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1984-03-28
1986-04-08
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307200B, 307446, 307359, 307270, 361 93, 361101, H03K 1708
Patent
active
045815518
ABSTRACT:
An I/O circuit is provided having a terminal for either receiving an input signal or providing an output signal. In one form, the circuit may be utilized in a system with multiple I/O circuits coupled via a two-wire interconnection having a common ground conductor throughout the system. Input signal levels are sensed within a narrow voltage range referenced, in part, to the V.sub.be of a bipolar transistor and independent of the power supply voltage of other interconnected circuits. In response to an enable signal, a differential amplifier provides an output drive signal proportional to the difference between the signal at the terminal and a reference voltage. The output drive signal is coupled to a driver stage which provides a predetermined limited current at the terminal, thereby providing an output signal. A voltage limiter allows the circuit to use bipolar transistors in a P-well CMOS process and to receive input voltages greater than the supply voltage of the circuit.
REFERENCES:
patent: 4168442 (1979-09-01), Satou et al.
patent: 4178620 (1979-12-01), Yu
patent: 4275313 (1981-06-01), Boll et al.
patent: 4288831 (1981-09-01), Dolikian
patent: 4306163 (1981-12-01), Blume, Jr. et al.
patent: 4344002 (1982-08-01), Chao
patent: 4347447 (1982-08-01), Proebsting
patent: 4363068 (1982-12-01), Burns
patent: 4413194 (1983-11-01), Birch
patent: 4479067 (1984-10-01), Fujita
patent: 4543494 (1985-09-01), Wakimoto
Vicary, "Semiconductor Chip Layout of a Driver/Receiver Circuit", IBM TDB vol. 19, No. 10, Mar. 1977, pp. 3739-3740.
Bayer et al., "FET to Bipolar Receiver with Overvoltage Protection", IBM TDB, vol. 18, No. 8, Jan. 1976, p. 2510.
Hudspeth D. R.
King Robert L.
Miller Stanley D.
Motorola Inc.
Myers Jeffrey Van
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