Communication circuit with voltage drop circuit and low voltage

Details Communication circuit with voltage drop circuit and low voltage Communication circuit with voltage drop circuit and low voltage

1995-08-24

1997-04-22

Pascal, Robert

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

331111, 331143, 331185, 323313, 323314, 365226, 327108, 327538, G05F 324, G05F 156

Patent

active

056232241

ABSTRACT:
A communication circuit system of an IC card etc. including a voltage drop circuit having a complementary type transistor circuit comprising a p-channel and an n-channel transistor connected together, the circuit being connected to a power source voltage and generating a voltage corresponding to the sum of the threshold voltages of the p-channel transistor and n-channel transistor and supplying the same to a load circuit; an oscillation circuit having a complementary MOS inverter, a capacitor connected to the input side of the complementary MOS inverter, and resistance elements connected between the input and output of the complementary MOS inverter; and a wave detection circuit having a first and second MOS transistors with drains and gates connected to each other and a current source, nodes between the drains and the gates of the first and second MOS transistors being connected to the current source, the gate of the first MOS transistor being connected to a signal input line, and the current capacity of the second MOS transistor being set larger than the current capacity of the first MOS transistor.

REFERENCES:
patent: 4128816 (1978-12-01), Shimotsuma
patent: 4618837 (1986-10-01), Matsuura
patent: 5124631 (1992-06-01), Terashima
patent: 5197033 (1993-03-01), Watanabe et al.

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