Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2005-08-09
2005-08-09
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
Reexamination Certificate
active
06927715
ABSTRACT:
A multi-level pulse width modulation (MPWM) digital-to-analog converter for receiving a n-bit pulse code modulation (PCM) signal and then outputting a m-level analog signal is provided. The MPWM DAC comprises a converter circuit, 2mfirst output drivers, 2msecond output drivers and a control circuit. The converter circuit is used for converting (n-m) most significant bits (MSB) of the n-bit PWM signal into a PWM waveform, and then generating a first input signal and a second input signal. Each of the 2mfirst output drivers is used for receiving the first input signal, and then generating a first output current, wherein the first output currents of the 2mfirst output drivers can be equal or not. Each of the 2msecond output drivers is used for receiving the second input signal, and then generating a second output current, wherein the second output currents of the 2mfirst output drivers can be equal or not. The control circuit is coupled to the converter circuit, 2mfirst output drivers, and 2msecond output drivers, for controlling the on-off status of each of the first and the second output drivers.
REFERENCES:
patent: 4384274 (1983-05-01), Mao
patent: 5796359 (1998-08-01), Beard
patent: 6014055 (2000-01-01), Chester
patent: 6606046 (2003-08-01), Kanno
Chang Sheng-Tsai
Lin You-Jan
Lo Kun-Ying
Yang Ming-Che
J.C. Patents
Jean-Pierre Peguy
Winbond Electronics Corp.
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