A Dual Mode 700 MSamples/s 6-bit, 200MSamples/s 7-bit A/D Converter in 0.25 Micron Digital CMOS
The design of a high speed A/D converter for hard disk drive read channels is described. It has 6-bits of resolution at full speed, as well as a 7-bit mode operating at a lower speed. The 7-bit mode is useful for servo signal processing. This A/D converter has been implemented in a four level metal, single poly 0.25μm CMOS technology. The chip operates at a speed of up to 700 MSamples/s in the 6-bit mode while maintaining an SNDR of greater than 35 dB at input frequencies of up to one fourth the sampling rate. In the 7-bit mode, the device operates at up to 200 MSamples/s with a SNDR greater than 40 dB. It occupies an active area of 0.45 sq. mm and consumes less than 187 mW of power.
KeywordsReference Voltage Output Buffer Auxiliary Input Input Transistor Source Follower
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