Comparators in ICs

Comparators in ICs
- Integrated Circuits -
- An Online Book -

Integrated Circuits http://www.globalsino.com/ICs/

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Figure 4880a shows the schematics of a typical power supply of DRAM. There are three voltage levels:
         i) the external voltage (V_CC) supplied to most of the peripheral circuits,
         ii) the internal limited voltage (V_LIM) supplied to the sense amplifiers,
         iii) the internal boosted voltage (V_BOOT) supplied to the row decoders and the word-drive decoders.

Schematics of a typical power supply of DRAM

Figure 4880a. Schematics of a typical power supply of DRAM. [1]. The ring oscillator in the boost circuit is controlled by the comparison of V_BOOT with V_LIM. so that V_BOOT is regulated at a constant level independent of the fluctuation of V_CC.

[1] K.Noda, T.Saeki, A.Tsujimoto, T.Murotani, and K.Koyama, A Boosted Dual Word-line Decoding Scheme for 256Mb DRAMs, DOI: 10.1109/VLSIC.1992.229266, (1992).

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