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A dB-linear programmable gain amplifier (PGA)utilizing weighted input transistors, is implemented in a 0.18 μm CMOS process. The weighed input transistor units with constant current-density enable insensitive gain-steps while maintaining the load impedance condition. The gain range can cover from -18 dB to +30 dB in 6 dB steps, and the gain error is less than 1 dB. The 3 dB bandwidth (BW) is 60 MHz...
Compact signal generators are a necessary component for many biomedical and chemical sensor microsystems. This paper presents a signal generator with precise digital frequency control that is 62% smaller the previous designs. The signal generator can produce analog sine waves and digital cosine waves from 4.8 Hz to 39 kHz with a SFDR greater than 99 dB. In a 0.5 mum CMOS process the total signal generator...
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