Video amplifier for a radar receiver
AssigneeRaytheon Company
InventorsJames T. Hanson, Walter Gordon Woodington, Michael Joseph Delcheccolo, Joseph S. Pleva, Mark E. Russell, H. Barteld Van Rees
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Abstract
A video amplifier for a radar receiver includes a temperature compensating attenuator. The attenuator includes a temperature sensitive device, such as a thermistor, arranged in a voltage divider network and is coupled in cascade between two filter stages. Each of the filter stages has a bandpass characteristic in order to filter low-frequency leakage signals and provide sensitivity control based on frequency and thus range, while also filtering high frequency signals to reduce aliasing.
Claims20
A video amplifier comprising:
- a first filter stage having an input terminal adapted to receive an RF signal and an output terminal;
- an attenuator having an input terminal coupled to the output terminal of said first filter stage and an output terminal, said attenuator comprising a temperature sensitive device;
- and
- a second filter stage having an input terminal coupled to the output terminal of the attenuator and an output terminal at which an output signal of said video amplifier is provided.
A radar receiver comprising:
- an RF amplifier having an input terminal adapted to receive an RF signal and an output terminal at which an amplified RF signal is provided;
- a down-converter having an input terminal coupled to said output terminal of said RF amplifier and an output terminal at which a lower frequency signal is provided;
- and
- a video amplifier having an input terminal coupled to said output terminal of said down-converter and an output terminal at which a filtered signal is provided, wherein said video amplifier comprises a temperature compensating attenuator.
A radar system comprising:
- a transmit antenna for transmitting a first RF signal;
- a receive antenna for receiving a second RF signal;
- and
- a receiver circuit coupled to said receive antenna for processing said second RF signal and comprising a temperature compensated video amplifier.
Dependencies are inferred from the claim text.