Broadband frequency multiplication by multitransition operation of step recovery diode
First Claim
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1. A circuit responsive to a periodic, alternating signal of a first frequency from a signal source for generating a second signal at a second frequency being a multiple of the first frequency, the circuit comprising:
- first filter means, connected to receive the alternating signal, for passing the alternating signal at said first frequency to an output;
pulse generating circuitry including a step recovery semiconductor diode connected to receive the alternating signal at the output from the first filter means and biasing means, resistively coupled to the diode to present a relatively high impedance thereto, for operating the diode at a level to produce two pulses for each periodic cycle of the alternating signal; and
second filter means, connected to receive the two pulses, for providing resonance at the second frequency to supply the second signal and capable of impedance matching the pulse generating circuitry to a predetermined impedance value.
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Abstract
A frequency multiplier which employs a step recovery diode operated in a double pulse mode for each period of the cycle of the input frequency signal provides efficient and high order harmonic generation. The bias circuitry for the diode and impedance characteristics of the input and output bandpass filters are selected to provide stable operation.
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Citations
8 Claims
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1. A circuit responsive to a periodic, alternating signal of a first frequency from a signal source for generating a second signal at a second frequency being a multiple of the first frequency, the circuit comprising:
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first filter means, connected to receive the alternating signal, for passing the alternating signal at said first frequency to an output; pulse generating circuitry including a step recovery semiconductor diode connected to receive the alternating signal at the output from the first filter means and biasing means, resistively coupled to the diode to present a relatively high impedance thereto, for operating the diode at a level to produce two pulses for each periodic cycle of the alternating signal; and second filter means, connected to receive the two pulses, for providing resonance at the second frequency to supply the second signal and capable of impedance matching the pulse generating circuitry to a predetermined impedance value. - View Dependent Claims (2, 3, 5, 6, 7, 8)
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4. A circuit responsive to an alternating current signal of a first frequency source for generating a second signal at a second frequency multiply related to the first frequency, the circuit comprising:
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first filter means, connected to receive the alternating signal, for passing the alternating signal at said first frequency to an output, the first filter means comprising a bandpass input filter having a passband coextensive with the first frequency and having a relatively high output impedance characteristic at frequencies less than the first frequency; pulse generating circuitry including a step recovery diode mounted to receive the alternating signal at the output from the first filter means and biasing means for operating the diode to produce two pulses for each cycle of the alternating signal, the biasing means presenting a relatively high impedance including a parallel resistive and capacitive network for developing a self-bias potential and the biasing means further including a resistor coupling the network to the step recovery semiconductor diode; and second filter means, connected to receive the two pulses, for providing resonance at the second frequency to supply the second signal and capable of impedance matching the pulse generating circuitry to a predetermined impedance value.
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Specification