Digital logic level conversion circuit with a small sinusodal wa

Details Digital logic level conversion circuit with a small sinusodal wa Digital logic level conversion circuit with a small sinusodal wa

1996-12-18

1999-03-09

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327166, 327206, 327299, H03L 500

Patent

active

058806164

ABSTRACT:
The digital logic level conversion circuit is for converting a small sinusoidal signal or an unbalanced digital signal to a balanced digital signal with 50% duty ratio, and includes an input level shift circuit, two differential amplifiers, an RS flip-flop, a charge-pump circuit, and a bias circuit. The input level shift circuit for AC coupling a sinusoidal wave with a small amplitude (with a minimum of 0.4 Vpp) and converting it into a middle logic level. The two differential amplifiers is used as comparators having hysteresis each other, operates inversely, and outputs digital signals into the RS flip-flop; the bias circuit for controlling a driving current of the differential amplifiers; the RS flip-flop for driving the charge-pump circuit by outputting a digital signal upon receiving outputs from the differential amplifiers; and the charge-pump circuit for generating a reference potential level of the differential amplifiers.

REFERENCES:
patent: 5023562 (1991-06-01), Gumussoy
patent: 5117124 (1992-05-01), Dicke
patent: 5514981 (1996-05-01), Tam et al.

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