Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1975-04-16
1976-09-28
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307296, H03K 112
Patent
active
039834220
ABSTRACT:
A detector which is subject to temperature variations and power supply drift including a tunnel diode circuit having first and second stable states and a variable threshold that is sensitive to noise and input signals within a useful frequency band and produces output signals when the amplitude of the noise or the input signals exceeds the instantaneous value of the variable threshold to cause the tunnel diode to switch from its first low voltage stable state to its second high voltage stable state. A control circuit coupled to the tunnel diode produces a square range-gate pulse having a pulse width which determines the interval during which the detector is sensitized and produces a reset pulse in response to the leading edge of the square range-gate pulse which sets the tunnel diode in its first stable state. A logic circuit also coupled to the tunnel diode produces an output signal indicative of the occurrence of noise or an input signal having an amplitude which exceeds the instantaneous value of the variable threshold occurring during the interval established by the range-gate pulse produced by the control circuit.
REFERENCES:
patent: 3755696 (1973-08-01), Nicolson et al.
patent: 3858204 (1974-12-01), Robbins et al.
Mara Richard M.
Nicolson Alexander M.
Davis B. P.
Miller, Jr. Stanley D.
Scott Thomas J.
Sperry Rand Corporation
Terry Howard P.
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