Multiplying digital-to-analog converter for high speed and low supply voltage
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United States of America Patent
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Jun 29, 2010
Grant Date -
Jun 24, 2010
app pub date -
Dec 19, 2008
filing date -
Dec 19, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multiplying digital-to-analog converter includes an operational amplifier (OP-amp) operated under a first power supply voltage and a second power supply voltage; an OP-amp input switch block coupled to a common mode voltage for selectively coupling the common mode voltage to input nodes of the OP-amp, wherein all switches included in the OP-amp input switch block are implemented utilizing PMOS transistors only, and the common mode voltage is substantially equal to the first power supply voltage; a capacitor block coupled to the OP-amp input switch block; a sampling switch block coupled to the input signal for selectively coupling the input signal to the capacitor block; a reference voltage switch block coupled to the capacitor block for selectively coupling the reference signal to the capacitor block; and a feedback switch block coupled between the capacitor block and output nodes of the OP-amp.
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