Pulse width discriminator applicable to ATC transponders

Details Pulse width discriminator applicable to ATC transponders Pulse width discriminator applicable to ATC transponders

1982-03-29

1984-12-04

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

307234, 328111, 343 68LC, H03K 522, H04Q 900

Patent

active

044867522

ABSTRACT:
A pulse width discriminating circuit and technique is disclosed which enables the rejection of pulses having a width less than and greater than predetermined limits. A received pulse is provided as one input to a counting circuit which is driven by a clock to provide count outputs as long as an input pulse is present. The counter has an output selected to indicate when the width of the pulse has exceeded a minimum time, and an output selected to indicate when the width of the pulse has exceeded a maximum time. The minimum pulse width output signal controls the entry of a pulse in a shift register. The shift register is shifted by a divided clock signal from the same clock that drives the counter and provides an output to a decoding circuit after a predetermined time if the pulse width falls within the predetermined range. The maximum pulse width output signal is coupled to reset the shift register so that the pulse in the shift register is discarded if the input pulse exceeds a predetermined width.

REFERENCES:
patent: 3678392 (1972-07-01), Houghton
patent: 3790881 (1974-02-01), Smith
patent: 3938146 (1976-02-01), Dano
patent: 3944982 (1976-03-01), Mogi et al.
patent: 3949199 (1976-04-01), Odom
patent: 3984775 (1976-10-01), Cariel et al.
patent: 4095125 (1978-06-01), Ingle

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