| 摘要 |
<p>A CMOS fractional reference source or voltage divider circuit includes a string (chain) of CMOS pairs (41,42;43,44) of transistors connected with their source-drain circuits in series and with ends of the string being connected across an input power (voltage) supply (45). The P-channel transistors (41,43) are matched in a one to one ratio, the N-channel transistors (42,44) are similarly matched. Output terminals (46) are connected at the nodes between pairs of transistors. Accurate tracking of the voltage of the power supply is achieved by connecting each gate of the chain in a manner to insure the same source-to-gate voltage on each transistor of the pair. In the preferred form, the string comprises two pairs of CMOS transistors and the voltage appearing at the output terminal thereof is equal to one half of the voltage of the power supply.</p> |
