Triangular-wave generating apparatus incorporating capacitor

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

Reexamination Certificate

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Details

C327S132000, C327S135000, C327S137000

Reexamination Certificate

active

07626430

ABSTRACT:
In a triangular-wave generating apparatus including an output terminal adapted to output an output voltage, an incorporated capacitor connected to the output terminal, a first variable current source adapted to charge the incorporated capacitor and a second variable current source adapted to discharge the incorporated capacitor, a charging/discharging current setting circuit sets a charging current in the first variable current source and sets a discharging current in the second variable current source. A level determining circuit determines whether or not the output voltage reaches one of predetermined voltages, to generate timing signals. A reference clock signal generating circuit generates a reference clock signal for defining a frequency of the output voltage. A charging/discharging current adjusting circuit adjusts the charging current and the discharging current in accordance with the timing signals and the reference clock signal.

REFERENCES:
patent: 3893036 (1975-07-01), Cavoretto et al.
patent: 6791405 (2004-09-01), Tsuji et al.
patent: 6956431 (2005-10-01), Maejima
patent: 7362150 (2008-04-01), Fukumoto
patent: 2002-217687 (2002-08-01), None

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