Low power VCC and temperature independent oscillator

Details Low power VCC and temperature independent oscillator Low power VCC and temperature independent oscillator

1994-07-07

1995-10-24

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Data refresh

365194, G11C 700

Patent

active

054615909

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: 4135125 (1979-01-01), Oura
patent: 4370628 (1983-01-01), Henderson et al.
patent: 4495425 (1985-01-01), McKenzie
patent: 4734656 (1988-03-01), Miller
patent: 4999814 (1991-03-01), Hashimoto
patent: 5315230 (1994-03-01), Cordoba et al.
Zhu, "Ultrastable Integrated CMOS Oscillator," International Journal of Electronics, vol. 70, No. 2, pp. 433-444, Feb. 1991, London, GB.
Abstract of Japanese patent document JP 22046088, Dec. 20, 1990.

Affiliated with

Also associated with

Rating

Low power VCC and temperature independent oscillator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low power VCC and temperature independent oscillator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low power VCC and temperature independent oscillator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1891785