Narrow range gate baseband receiver
First Claim
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1. An apparatus for detecting pulsed signals comprising:
- means for receiving said pulse signals;
first bistable means having first and second switchable stable states for switching from said first state to said second state in response to pulse signals coupled thereto from said receiving means;
second bistable means having first and second switchable stable states coupled to said first bistable means with a node therebetween, said node having substantially a low level signal thereat when said first and second bistable means are in said first state and a detectable level signal when a pulsed signal from said receiving means causes said first bistable means to switch to said second stable state;
third bistable means having first and second switchable stable states coupled to said node and responsive to said detectable level signal for switching from said first stable state to said second stable state, thereby generating an output pulsed signal;
generator means for providing first and second pulses of substantially equal duration and opposite polarity;
first means coupled between said generator means and said first bistable means for receiving and differentiating said first pulses; and
second means coupled between said generator means and said second bistable means for receiving and differentiating said second pulses.
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Abstract
A baseband receiver with a range gate interval in the order of nanoseconds. A tunnel diode, set to the low level state, is coupled across the output terminals of a bridge that is balanced in the absence of a received signal, during the range gate interval. Signals received by an antenna are coupled to a tunnel diode in an arm of the bridge causing it to change from its low level state to its high level state thereby unbalancing the bridge and establishing a voltage at the output terminals of the bridge that fires the tunnel diode coupled thereacross.
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Citations
9 Claims
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1. An apparatus for detecting pulsed signals comprising:
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means for receiving said pulse signals; first bistable means having first and second switchable stable states for switching from said first state to said second state in response to pulse signals coupled thereto from said receiving means; second bistable means having first and second switchable stable states coupled to said first bistable means with a node therebetween, said node having substantially a low level signal thereat when said first and second bistable means are in said first state and a detectable level signal when a pulsed signal from said receiving means causes said first bistable means to switch to said second stable state; third bistable means having first and second switchable stable states coupled to said node and responsive to said detectable level signal for switching from said first stable state to said second stable state, thereby generating an output pulsed signal; generator means for providing first and second pulses of substantially equal duration and opposite polarity; first means coupled between said generator means and said first bistable means for receiving and differentiating said first pulses; and second means coupled between said generator means and said second bistable means for receiving and differentiating said second pulses. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for detecting pulsed signals comprising:
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first delay means coupled between a first node and a second node for delaying signals coupled thereto from said second node for a first time duration; second delay means coupled between said first node and a third node for delaying signals coupled thereto from said third node for a second time duration; means coupled to said third node for receiving said pulsed signals; gating signal generator means coupled to said second and third nodes for generating pulsed signals at said second and third nodes that are substantially in phase opposition, said first and second delay means being chosen such that said pulse signals from said gating signal generator means substantially coalesce at said first node; first bistable means, having first and second switchable stable states, coupled to said third node, set in said first stable state in response to a leading edge of said pulsed signal at said third node and reset in response to a trailing edge thereof, and switchable from said first stable state to said second stable state in response to received pulse signals; and second bistable means having a first and second switchable stable states coupled to said first node and responsive to pulse signals thereat to switch from said first stable state to said second stable state thereby generating an output pulse signal. - View Dependent Claims (7, 8, 9)
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Specification