首页>
外国专利>
INTEGRATED DIGITAL / ANALOG CONVERTER FOR OPERATION WITH LOW SUPPLY PERFORMANCE
INTEGRATED DIGITAL / ANALOG CONVERTER FOR OPERATION WITH LOW SUPPLY PERFORMANCE
展开▼
机译:集成数字/模拟转换器,可实现低电源性能
展开▼
页面导航
摘要
著录项
相似文献
摘要
A digital-to-analog converter for operating in a low power condition includes a delta-sigma modulator (10) for converting an n-bit digital input signal to an m-bit digital output signal. The output signal is filtered with a switched-capacitor filter (12) and an active RC low-pass filter (18). A low power supply detect circuit receives two power supply input voltages, the low and the high power supplies, and outputs a control signal on a line (38) indicating a low power supply condition. The digital-to-analog converter includes an output stage (26) with the analog output thereof being connected to an analog output terminal (30). A switch (28) is provided for connecting the output stage to the analog output terminal (30) in normal operating mode. In a low power mode, the low power detect circuit (20) generates a control signal on line (38) in response to the power supply voltage falling below a predetermined threshold. The switch (28) is opened and a shunt switch (32) provides a squelch operation by being configured in a closed configuration during a low power condition. Alternately, the output stage (26) can be powered down in the low power condition.
展开▼