Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output
Reexamination Certificate
2007-02-27
2007-02-27
Ton, My-Trang Nu (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sawtooth or triangular output
Reexamination Certificate
active
11170517
ABSTRACT:
A triangular wave generating circuit adapted to a class-D amplifier is designed not to use a PLL circuit and to secure robustness regarding an amplification gain irrespective of variations of voltages, thus producing a high-quality triangular wave with a simple circuit constitution. First and second constant currents, which are generated in proportion to positive and negative voltages, are alternately and periodically selected using high impedance elements without causing noise. A first integrator produces a triangular wave in response to charged electricity realized by the first and second constant currents, wherein the triangular wave is supplied to a second integrator performing servo-amplification operation so as to suppress phase shifts thereof. Hence, it is possible to maintain a constant gain for the class-D amplifier irrespective of variations of voltages since the maximal and minimal voltages values of the triangular wave are made proportional to the positive and negative voltages.
REFERENCES:
patent: 6211746 (2001-04-01), Segawa et al.
patent: 6265921 (2001-07-01), Heinrich
patent: 6791405 (2004-09-01), Tsuji
patent: 6956431 (2005-10-01), Maejima
patent: 01-318424 (1989-12-01), None
patent: 2004-007324 (2004-01-01), None
Nu Ton My-Trang
Pillsbury Winthrop Shaw & Pittman LLP
Yamaha Corporation
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