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US 5,999,061 AGranted
First and second oscillator circuits selectively coupled through passive output circuit to a load
AssigneeVari-L Company, Inc.
InventorsMatthew D. Pope, Jeffrey T. Gudewicz
Life of this patent
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Abstract
An oscillator having two oscillation circuits with widely different frequencies with a common passive switched output circuit. Each oscillator circuit includes a transmission line inductive impedance between the oscillator output and ground. The inductive impedances are selected to be open at the operating frequency of the associated oscillator circuit and a short or a low impedance at the frequency of the other oscillator circuit. Each inductive impedance forms a portion of an impedance matching pad for the other oscillator circuit.
Claims8
An electronic oscillator comprising:
- a first oscillator circuit having a first oscillator output and a first inductive impedance connected between said first oscillator output and an RF ground,
- a second oscillator circuit having a second oscillator output and a second inductive impedance connected between said second oscillator output and said RF ground, and
- a output circuit connected to said first oscillator output and to said second oscillator output, said output circuit including an output terminal connected to a load, said output circuit and said second inductive impedance forming a first transforming pad for said first oscillator circuit when said first oscillator circuit is operating to match the impedance of said first oscillator circuit to the impedance of said load, said output circuit and said first inductive impedance forming a second transforming pad for said second oscillator circuit when said second oscillator circuit is operating to match the impedance of said second oscillator circuit to the impedance of said load.
An electric oscillator comprising:
- a first oscillator circuit having a first oscillation frequency, and including a first oscillator output and a first inductive impedance connecting between said first oscillator output and ground, said first inductive impedance including a first transmission line having a one quarter wavelength length at said first oscillation frequency,
- a second oscillator circuit having a second oscillation frequency that is in the range of about 1.5 to 2.5 times the first oscillation frequency, said second oscillator circuit including a second oscillator output and a second inductive impedance connecting between said second oscillator output and ground, said second inductive impedance including a second transmission line having a one quarter wavelength length at said second oscillation frequency, and
- a passive switched output circuit having a first resistor, a second resistor and an output terminal, said first resistor having a first side that connects to said first oscillator output and said first inductive impedance and a second side that connects to said output terminal, said second resistor having a third side that connects to said second oscillator output and said second inductive impedance and a fourth side that connects to said output terminal, said output terminal connecting to a load,
- said output circuit with said second inductive impedance forming a first transforming pad for said first oscillator circuit when said first oscillator circuit is operating, to match the impedance of said first oscillator circuit to said load, said first transforming pad having a first through leg including said first resistor and a first shunt leg including said second resistor and said second inductive impedance with said second transmission line being about one eighth wavelength at said first oscillation frequency and therefore a low impedance,
- said output circuit with said first inductive impedance forming a second transforming pad for said second oscillator circuit when said second oscillator circuit is operating, to match the impedance of said second oscillator circuit to said load, said second transforming pad having a second through leg including said second resistor and a second shunt leg including said first resistor and said first inductive impedance with said first transmission line being about one half wavelength at said second oscillation frequency and therefore substantially a short.
2 more elements
Dependencies are inferred from the claim text.