Maximized multi-state compaction and more tolerance in memory state behavior is achieved through a flexible, self-consistent and self-adapting mode of detection, covering a wide dynamic range. For high density multi-state encoding, this approach borders on full analog treatment, dictating analog techniques...http://www.google.com.hk/patents/US20080043529?utm_source=gb-gplus-share專利 US20080043529 - Novel Multi-State Memory
