Design of Analog CMOS Integrated Circuits
Design of Analog CMOS Integrated Circuits
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A low voltage switched-capacitor circuit thatgenerates an almost constant reference current acrossprocess, voltage and temperature (PVT) is proposed. Thereference voltage is generated by a low voltage band-gapcircuit. The output reference current is obtained byapplying the generated reference voltage to a low voltageV - I converter. The resistor in the proposed V - Iconverter is further replaced by a switched capacitorresistor. Due to less variation in the capacitor valueacross PVT's and high accuracy in integrated voltagereference, the output reference current remains fairlyconstant. The circuit has been designed in 0.13u CMOSprocess at 1.5V supply voltage. The simulation resultsshow that the output reference current is quite insensitiveto PVT and varies linearly with clock frequency andcapacitor value of the switched capacitor resistor.