Intrinsically safe logic and-circuit having two inputs
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 18, 1994
Grant Date -
N/A
app pub date -
Jun 29, 1993
filing date -
Sep 2, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A logic AND circuit comprises, in a cascade arrangement, a threshold oscillator having a power supply input connected to a first circuit input and a clamping amplifier providing an output signal only when simultaneously the voltage on a second circuit input exceeds a threshold and the threshold oscillator delivers an output signal. The oscillator comprises a single transistor whose emitter and collector circuits contain two primary windings of a transformer whose secondary winding constitutes a tuned circuit in association with a four-lead capacitor and whose base is biased from the first input via a filter cell having a parallel-connected four-lead capacitor. The clamping amplifier includes a single transistor connected to the second input via a filter cell having a parallel-connected four-lead capacitor, with one of its emitter and collector circuits containing the primary winding of another transformer whose secondary winding contains a resonant circuit with a parallel-connected four-lead capacitor from whose terminals an alternating output signal is taken.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully