Low power V.sub.cc and temperature independent oscillator
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United States of America Patent
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Sep 6, 1994
Grant Date -
N/A
app pub date -
Oct 22, 1992
filing date -
Oct 22, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A constant current source is used to provide a constant current to set a delay which defines the period of the output of the oscillator. The delay is preferably set by charging a capacitor with the constant current. Because the current is independent of variations in V.sub.CC and temperature, the capacitor will charge for a given period. Therefore, the frequency or period of oscillation will also be fixed and independent of variation in V.sub.CC or temperature. A current limiting circuit and latch are provided to generate an output which will be transmitted through one or a series of inverters. In an alternate embodiment, a differential amplifier is provided between the delay circuit and the current limiting circuit. This differential amplifier is typically needed in a case where VCC is not well-controlled to provide an output signal which has an appropriate voltage. A method of generating an oscillating output for refreshing a DRAM and a method :for refreshing a DRAM are also disclosed.
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