Low power V.sub.cc and temperature independent oscillator

Details Low power V.sub.cc and temperature independent oscillator Low power V.sub.cc and temperature independent oscillator

1992-10-22

1994-09-06

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331143, H03K 3354, H03K 303

Patent

active

053451953

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.

REFERENCES:
patent: 4370628 (1983-01-01), Henderson et al.
patent: 4734656 (1988-03-01), Miller
ZHU, "Ultrastable Integrated CMOS Oscillator," International Journal of Electronics, vol. 70, No. 2, pp. 433-444, Feb. 1991, London, GB.

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