Frequency detecting circuit

Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By frequency

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Details

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.

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