Video amplifier for a radar receiver
First Claim
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1. 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.
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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.
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Citations
20 Claims
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1. A video amplifier comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A radar receiver comprising:
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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. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A radar system comprising:
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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. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification