Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2008-06-19
2011-11-29
Mottola, Steven J (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
Reexamination Certificate
active
08067980
ABSTRACT:
A pulse width modulation (PWM) circuit comprises a first integrator (g m1) with a first feedback capacitor (C1), a second integrator (gm1) with a second feedback capacitor (C2) and a comparator (A0) having a first input (V1) connected to the output of the first integrator (gm1) and a second input (V2) connected to the output of the second integrator (gm2). A connection path comprising a resistor (R2) is established from the output of the first integrator (gm1) to an input of the second integrator (gm2). The first and second feedback capacitors (C1, C2) have capacities with a non-linear factor X(V) and a circuit with an inversely non-linear factor X−1(V) is arranged in the connection path between the output of the first integrator (gm1) and said input of the second integrator (gm2). The PWM circuit may form path of a Class-D amplifier.
REFERENCES:
patent: 3316497 (1967-04-01), Brooks
patent: 3390341 (1968-06-01), Kline
patent: 3654563 (1972-04-01), Hesler et al.
patent: 4749951 (1988-06-01), Tanaka
patent: 6577186 (2003-06-01), Berkhout
patent: 7262658 (2007-08-01), Ramaswamy et al.
patent: 2005/0156665 (2005-07-01), Maejima
patent: 2009/0315623 (2009-12-01), Dooper et al.
patent: 0644649 (1995-03-01), None
patent: 1594244 (2005-11-01), None
patent: 1630954 (2006-03-01), None
patent: 1657815 (2006-05-01), None
patent: 02/086795 (2002-10-01), None
Berkhout, M. “An Integrated 200-W Class-D Audio Amplifier,” IEEE Journal of Solid-State Circuits, vol. 38, No. 7 (Jul. 2003), pp. 1198-1206.
Behr, A.T. et al. Nonlinearities of Capacitors Realized by MOSFET Gatesproceedings of the Int'l Symposium on Circuits and Systems (IEEE), vol. 3 (May 1992), pp. 1284-1287.
Gaalaas, E. et al. “Integrated Stereo ΔΣ Class D Amplifier”, IEEE Journal of Solid-State Circuits, vol. 40, No. 12 (Dec. 2005), pp. 2388-2397.
Wang, C. et al. “A Nonlinear Capacitance Cancellation Technique and Its Application to a CMOS Class AB Power Amplifier”, 2001 IEEE Radio Frequency Integrated Circuits Symposium (May 2001), pp. 39-42.
International Search Report for Int'l Patent Appln. No. PCT/IB2008/052419 (Nov. 27, 2008).
Berkhout Marco
Krabbenborg Benno
Mottola Steven J
NXP B.V.
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