Electrohome Limited

Gerald Waldeck

A wide frequency range, switched-band, output signal from an oscillator is obtained by dividing the overall oscillator bandwidth into two bands having an overlapping band of frequencies. An input signal that triggers the oscillator also is supplied to a frequency-to-voltage converter. The magnitude of its output signal is compared to a reference signal in a comparator, and a control signal having a certain characteristic is derived when the input signal is in the high band of frequencies. When the input signal is in the low band, the control signal has a characteristic that is different from the first-mentioned characteristic. Switching takes place in the overlapping band of frequencies. The control signal is applied to a switching device that adds or removes impedance, e.g., capacitance from the capacitive part of the, for example, resistive-capacitive, frequency-determining network of the oscillator depending upon the characteristic of the control signal.

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Waterloo, Canada

Gerald Waldeck