Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By frequency
Patent
1998-10-06
2000-06-27
Le, Dinh T.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By frequency
327 49, 327218, 327 47, 327 42, G06F 9305, H03D 1300, H03L 709
Patent
active
060811374
ABSTRACT:
A frequency detecting circuit is provided that includes a level shift detecting unit for generating pulse signals of a certain pulse width at each level shifting of input clock signals and a level detecting unit. The level detecting unit includes a charging unit and a discharging unit. The discharging unit is activated by the pulse signals of the level shift detecting unit to discharge the charges of the charging unit. An inverter having a logic threshold voltage receives electrical signals in accordance with the charged level of the charging unit to output a signal indicative of the frequency of the input clock signals.
REFERENCES:
patent: 5533136 (1996-07-01), Smith
patent: 5619157 (1997-04-01), Kumata et al.
patent: 5926042 (1999-07-01), Talaga, Jr.
Pearson, "One Shot/Flip-Flop Pairs Detect Frequency Bands", Electronics, Apr. 24, 1972, p. 104.
Le Dinh T.
LG Semicon Co. Ltd.
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