Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output
Reexamination Certificate
2007-09-18
2007-09-18
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sawtooth or triangular output
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.
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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.
Cottin Denis
Garnier Christophe
Almo Khareem E.
Bongini Stephen
Fleit Kain Gibbons Gutman Bongini & Bianco P.L.
Jorgenson Lisa K.
STMicroelectronics SA
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