Local oscillator having improved oscillation characteristic
AssigneeSharp Kabushiki Kaisha
InventorsMasayuki Nibe, Masahiro Kato
Life of this patent
Estimating the term…
Abstract
A local oscillator has the following construction so that easier design can be achieved, stable oscillation characteristic can be provided and the manufacturing cost can be reduced. A high impedance line, a ground pattern with a through hole, and a coupling line are formed on a printed circuit board. A chip part, such as HEMT, and a dielectric resonator are mounted thereon by die bonding. A terminal of HEMT is connected to the pattern formed on the printed circuit board by wire bonding. A drain terminal of the HEMT is connected to a bias circuit. The bias circuit includes a stub for grounding, a high impedance line, and a chip capacitor.
Claims18
A local oscillator comprising:
- a high electron mobility transistor (HEMT) operating as an oscillation element wherein the HEMT includes two drain terminals;
- a bias circuit having one end connected to a power supply and another end connected to a drain terminal of said oscillation element;
- and
- a printed circuit board, said oscillation element and said bias circuit being provided on the printed circuit board,
- said bias circuit including a first stub and a chip capacitor for grounding, and a high impedance line for blocking relatively high frequency components of received signals.
A local oscillator comprising:
- an oscillation element having two drain terminals,
- a bias circuit having one end connected to a power supply and another end connected to a first drain terminal of said oscillation element, and
- a stub for grounding, connected to a second drain terminal of said oscillation element.
A local oscillator, comprising:
- an oscillation element includes two drain terminals;
- a bias circuit having one end connected to a power supply and another end connected to a drain terminal of said oscillation element,
- said bias circuit including an impedance line with a U-shaped pattern.
An antenna unit including a local oscillator, said local oscillator, comprising:
- an oscillation element having two drain terminals;
- a bias circuit having one end connected to a power supply and another end connected to a first drain terminal of said oscillation element;
- and
- a stub for grounding, connected to a second drain terminal of said oscillation element.
Dependencies are inferred from the claim text.