A CMOS digitally programmable slew-rate operational amplifier

A design methodology to program the slew rate of an operational amplifier (op-amp) is proposed. The designed amplifier fabricated by a 1.0 /spl mu/m single-poly double-metal twin-well CMOS process is capable of providing a programmable extra bias current which can be linearly controlled by an external 4-b digital signal. The experimental results showed that the slew rate and power dissipation of the designed amplifier were linearly controlled from 5 V//spl mu/s to 40 V//spl mu/s and from 1.1 mW to 4.0 mW for a /spl plusmn/4 V power supply, respectively.<
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