Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1978-10-02
1980-07-01
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307237, 307251, 307297, H03K 1760, H03K 508
Patent
active
042108292
ABSTRACT:
A power up circuit for an associated digital circuit is disclosed which prevents noise from falsely resetting the associated digital circuit after completion of the powering up function. The power up circuit has a series connection of a first capacitor and a high impedance coupled between the power supply and ground. The high impedance is connected in parallel with the source and drain electrodes of an enhancement type field effect transistor. The node of the high impedance and the first capacitor is connected to an inverting amplifier which produces an inverted output after the input signal falls to a threshold potential. The output of the inverting amplifier is connected to the gate of the field effect transistor and to a second capacitor which is connected to ground. The output of the inverting amplifier is applied to the reset line of the associated digital circuit to cause resetting of the digital circuit upon the connection of the power supply to the digital circuit. After powering up, the field effect transistor is biased on by the output of the inverting amplifier. Any noise pulses which are coupled to the first capacitor are shunted to ground by the low impedance of the turned on field effect transistor.
REFERENCES:
patent: 3774053 (1973-11-01), Carlson
patent: 3895239 (1975-07-01), Alaspa
patent: 3904975 (1975-09-01), Satoh
patent: 3950654 (1976-04-01), Broedner et al.
Chow Edwin M. W.
Wong Thomas S. W.
Wong Wing Y.
Davis B. P.
Miller, Jr. Stanley D.
National Semiconductor Corporation
Sheridan James A.
Woodward Gail W.
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