| US 7,548,191 B2 | ||
| Radar oscillator capable of preventing leak of oscillation output | ||
| Yutaka Arayashiki, Hadano (Japan); Sumio Saito, Atsugi (Japan); and Masanori Ejima, Kuki (Japan) | ||
| Assigned to Anritsu Corporation, Kanagawa (Japan); and Matsushita Electric Industrial Co., Ltd., Osaka (Japan) | ||
| Filed on Sep. 04, 2008, as Appl. No. 12/204,675. | ||
| Application 12/204675 is a division of application No. 10/562988, granted, now 7,450,058, previously published as PCT/JP2005/009382, filed on May 23, 2005. | ||
| Claims priority of application No. 2004-160977 (JP), filed on May 31, 2004. | ||
| Prior Publication US 2009/0027259 A1, Jan. 29, 2009 | ||
| Int. Cl. G01S 13/02 (2006.01); G01S 7/03 (2006.01) | ||
| U.S. Cl. 342—175 [342/196] | 5 Claims |
| 1. A radar oscillator comprising:
an oscillating unit having amplifier means, a feedback circuit which applies a positive feedback from an output side to an
input side of the amplifier means and a resonator which resonates at the predetermined frequency, the feedback circuit and
the resonator cooperating with the amplifier means to enable oscillation at a predetermined frequency, the resonator being
connected to an input section or output section of the amplifier means, and the oscillating unit outputting and stopping an
oscillation signal having the predetermined frequency from the output side of the amplifier means in an oscillating state
and an oscillation stop state, respectively; and
switching means connected to the oscillating unit, the switching means including an electronic switch which receives a pulse
signal indicating a transmission timing of a radar wave and changes an operating state of the oscillating unit to the oscillating
state at a first level of the pulse signal and the oscillation stop state at a second level of the pulse signal in order to
intermit an output of the oscillation signal in response to a level of the pulse signal;
wherein the amplifier means includes an amplifier provided in an output stage of the oscillating unit;
wherein the oscillating unit has a power supply line for the amplifier means in the oscillating unit; and
wherein the switching means includes a first switch which opens or closes the power supply line for the amplifier means in
the oscillating unit based on the pulse signal indicating the transmission timing of the radar wave, thereby changing the
operating state of the oscillating unit to the oscillating state or the oscillation stop state
wherein the oscillating unit has a plurality of amplifiers cascade-connected to each other as the amplifier means;
wherein the feedback circuit is arranged to apply a positive feedback to the input side of an amplifier at a first stage from
the output side of an amplifier at a final stage of the plurality of amplifiers, and the resonator is connected to a cascade-connecting
section of the plurality of amplifiers; and
wherein the oscillating unit outputs and stops the oscillation signal having the predetermined frequency determined by the
resonator from the output side of the amplifier at the final stage of the plurality of amplifiers in the oscillating state
and the oscillation stop state.
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