Apparatus and method for producing linear frequency sweep

Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Transmitter

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331 4, G01S 1332

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active

047542772

ABSTRACT:
A circuit and method for generating an output signal having an output frequency that varies linearly with time, and an FM CW radar system utilizing such a circuit. The circuit includes a VCO, a rate detector, a phase detector, a filter and an integrator. The VCO produces an output signal at its output terminal at an output frequency that corresponds to the voltage of a tuning signal applied to the VCO input terminal. The rate detector receives the output signal and produces a rate signal having a rate frequency that corresponds to the rate of change of the output frequency. The phase detector compares the rate signal to a reference signal having a fixed frequency, and produces a correction signal corresponding to the phase difference between the rate and reference signals. The filter filters the correction signal to produce a first current signal, and the integrator integrates the first current signal to produce the tuning signal. The circuit may also include a current source for producing a constant magnitude second current signal, in which case the integrator integrates the combined first and second current signals to produce the tuning signal.

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