Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2007-01-09
2007-01-09
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C330S010000, C330S251000
Reexamination Certificate
active
11215008
ABSTRACT:
The PWM modulation circuit according to the invention is connected to an input terminal for an analog baseband signal and a staircase generating circuit generating a staircase wave, and carries out PWM modulation to a staircase wave input from the staircase generating circuit based on an analog baseband signal input from the input terminal. The staircase generating circuit includes a plurality of constant current source circuits, a plurality of switches connected to the plurality of constant current source circuits on a one-to-one basis, a serial-parallel conversion circuit that carries out serial-parallel conversion to a clock signal input from a clock signal input terminal and outputs the result to the plurality of switches, and an output voltage control circuit that converts a constant current input from the plurality of constant current source circuits into a constant voltage at an arbitrary value and outputs the result. The plurality of switches switch between their on and off states in response to a clock signal input from the serial-parallel conversion circuit. The output voltage control circuit converts a constant current input from the plurality of constant current source circuits connected to the plurality of switches in an on state into a constant voltage in a prescribed ratio, so that a staircase wave is generated.
REFERENCES:
patent: 4415863 (1983-11-01), Tokumo
patent: 4739304 (1988-04-01), Takeda et al.
patent: 6188261 (2001-02-01), Nosaka et al.
patent: 6208280 (2001-03-01), Baker et al.
patent: 6542097 (2003-04-01), Tafuru
patent: 6563376 (2003-05-01), Fujisawa
patent: 6614297 (2003-07-01), Score et al.
Barnie Rexford
Khai Nguyen
McDermott Will & Emery LLP
LandOfFree
PWM modulation circuit and class D amplifier using such PWM... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with PWM modulation circuit and class D amplifier using such PWM..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PWM modulation circuit and class D amplifier using such PWM... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3772931