Controlled slope voltage ramp generator

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output

Reexamination Certificate

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Details

C327S140000

Reexamination Certificate

active

10989097

ABSTRACT:
A ramp generator is provided that includes an amplifier, first and second transistors, a variable resistive load having a control electrode, and a capacitor. The amplifier has an inverting input that receives a first reference voltage, and an output connected to the gate of the first transistor. The first transistor has a source connected to a second reference voltage, and a drain connected to the non-inverting input of the amplifier and also to the variable resistive load. The second transistor mirrors the current of the first transistor so as to charge the capacitor, which is periodically discharged by a discharging circuit. In one embodiment, the generator further comprises a comparator, a filter, and an integrator that control the variable resistive load so as to generate a slope having characteristics that are noticeably independent from dispersion, from manufacturing methods, and temperature.

REFERENCES:
patent: 4626702 (1986-12-01), Chito
patent: 6876244 (2005-04-01), Moraveji
patent: 6946917 (2005-09-01), Raha
patent: 03109812 (1991-05-01), None
patent: 04048812 (1992-02-01), None
patent: 06282338 (1994-10-01), None
B. Kaczynski, “Sawtooth Generator Exhibits 1% Linearity and Over 80-dB Dynamic Range”, Electronic Design, Penton Publishing, vol. 47, No. 15, Jul. 26, 1999, p. 84, XP000928126.
French Preliminary Search Report dated Jun. 2, 2004 for French Application No. 03 13355.

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