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US 6,035,002 AGranted
Digital super-regenerative detector RF receiver
AssigneeThe Chamberlain Group, Inc.
InventorFred Freybler Schleifer
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Abstract
A digital super-regenerative receiver is provided having an analog RF detector and a regenerative oscillator. The output of the RF detector is used to generate a digital signal from which the oscillator bias is adjusted, in order to maintain the oscillator start-up time at a fixed level. The circuit senses if the start-up time is earlier or later than the predetermined start-up time and produces an output when the majority of the start times are ahead of the expected start time.
Claims2
A receiver for receiving a digitally coded radio-frequency signal from a transmitter, comprising:
- an RF detector for detecting the digitally coded radio-frequency signal and for generating a digital signal responsive to the digitally coded radio-frequency signal, the RF detector comprising an analog amplifier coupled to an analog oscillator for generating an analog oscillator signal and a digital signal generator responsive to the analog oscillator signal for producing the digital signal;
- a clock signal generator for producing a clock signal;
- a delayed clock signal generator for generating a first offset clock signal and a second offset clock signal in response to the clock signal;
- and
- a first comparator for comparing the second offset clock signal with the digital signal and producing a combination clocked and analog bias signal and supplying the combination clocked and analog bias signal to the oscillator to stabilize the oscillator timing;
- a second comparator for comparing the first offset signal with the digital signal and generating a detected code signal in response thereto.
3 more elements
Dependencies are inferred from the claim text.