Low power self refresh timer oscillator

Details Low power self refresh timer oscillator Low power self refresh timer oscillator

2006-10-17

2006-10-17

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S143000, C331S153000

Reexamination Certificate

active

07123110

ABSTRACT:
A low power oscillator circuit for a self-refresh timer in a memory array is disclosed. When a voltage (V1) of a comparison node (N1) exceeds a first reference voltage (Vref1), a differential amplifier (101) in an oscillator (1) causes a pulse generator (110) to output a pulse. A charge/discharge circuit (105) discharges the comparison node (N1) in response to pulse. In this event, a control circuit (4) disables a first control signal (CT1) to halt operation of the differential amplifier (101). When the voltage (V1) exceeds a second reference voltage (Vref2) equivalent to the sum of threshold voltages of a discharge circuit (43) in consequence of gradually charging the comparison node (N1) by the charge/discharge circuit (105) after it was discharged, the control circuit (4) activates the first control signal (CT1) to operate the differential amplifier (101).

REFERENCES:
patent: 3831113 (1974-08-01), Ahmed
patent: 5412350 (1995-05-01), Kim
patent: 5889441 (1999-03-01), Inn
patent: A-H08-279733 (1996-07-01), None
patent: A-H08-171795 (1996-10-01), None
patent: A-H10-289573 (1998-10-01), None
patent: A-2000-163955 (2000-06-01), None

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