Pulse-width-modulated digital-to-analog converter with high gain and low gain modes
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United States of America Patent
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Jan 27, 1998
Grant Date -
N/A
app pub date -
Jul 9, 1996
filing date -
Jul 9, 1996
priority date (Note) -
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Abstract
A pulse-width-modulated digital-to-analog converter is responsive to a digital control value for switching between a high gain mode and a low gain mode. The converter includes a free-running rollover counter, a reference register and a comparator. Pulses from a comparator are split into two paths, one path including a switch, and fed into a plurality of resistive elements connected connected to a common output node. Depending on the state of the switch, the network's output value will either follow its input or be a fraction thereof, without change of duty cycle or output impedance. The output node may be connected to a capacitive element to form a low pass filter for generating an analog waveform.
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