Trapezoid signal generating circuit

Details Trapezoid signal generating circuit Trapezoid signal generating circuit

2006-12-26

2006-12-26

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Generating trapezoidal output

Reexamination Certificate

active

07154310

ABSTRACT:
A trapezoid signal generating circuit has a charging and discharging circuit for a capacitor to generate a trapezoid signal which has less change at its rising portion and falling portion. Current output circuits supply a charging current and a discharging current in accordance with a voltage outputted from a current control circuit, respectively. The current control circuit has a charging and discharging circuit similar to the charging and discharging circuit, and produces an output voltage. This voltage increases in accordance with a linear function for a period from a time point when an input signal changes its level to a time point when the voltage reaches a reference voltage, and decreases thereafter in accordance with a linear function. The current flowing into the capacitor also increases and decreases in accordance with the linear function, so that the terminal voltage of the capacitor increases and decreases in accordance with a quadratic function.

REFERENCES:
patent: 4320521 (1982-03-01), Balakrishnan et al.
patent: 5025172 (1991-06-01), Carroll et al.
patent: 7005901 (2006-02-01), Jiang et al.
patent: A-S52-112263 (1977-09-01), None

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