Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
1998-07-23
2001-01-09
Kinkead, Arnold (Department: 2817)
Oscillators
Solid state active element oscillator
Transistors
C331S096000, C331S1070SL, C331S17700V, C333S235000
Reexamination Certificate
active
06172577
ABSTRACT:
This application corresponds to Japanese Patent Application Nos. 9-200110 and 9-200111, both filed on Jul. 25, 1997, and both of which are hereby incorporated by reference in their entireties.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an oscillator and an oscillation apparatus using the oscillator. More specifically, this invention relates to a base-grounded or gate-grounded oscillator with a quarter-wave open-circuit terminal stub connected to the base or gate of a transistor and an oscillation apparatus using the oscillator.
Furthermore, the present invention relates to an oscillation apparatus, and more particularly relates to an oscillation apparatus with an oscillator and a resonator both of which are magnetically coupled.
2. Description of the Related Art
A conventional oscillator using a dielectric resonator has a circuit configuration shown in
FIG. 7
, for example. The oscillator
50
shown in
FIG. 7
is called a band reflection type oscillator. In this type of oscillator, a transistor
51
for oscillation, such as a silicon bipolar transistor, is arranged on, for example, a dielectric substrate (not illustrated), and a stripline
52
is connected to the base. To the stripline
52
, a DC cut-off capacitor
53
and a terminating resistance
54
are connected in series. Moreover, a dielectric resonator
55
is arranged in the vicinity of the stripline
52
, and the arrangement causes the stripline
52
to be magnetically coupled to the dielectric resonator
55
. Further, the collector of the oscillation transistor
51
is grounded. Also, the emitter of the oscillation transistor
51
is connected to the collector and base via respective capacitors. Here, the terminating resistor
54
functions to eliminate unwanted oscillation except the resonance frequency of the dielectric resonator
55
. In addition, the internal and stray capacitance of the oscillation transistor
51
can be substituted for the capacitance between the emitter and collector and between the emitter and base of the oscillation transistor
51
shown in
FIG. 7
, and accordingly those capacitors are not generally formed as external components.
The oscillator
60
shown in
FIG. 8
is called a reflection type of oscillator, in which an oscillation transistor
51
, such as a silicon bipolar transistor, is arranged on, for example, a dielectric substrate (not illustrated). To the base of the transistor, a half-wave open-circuit terminal stub
61
is connected. Also, the collector of the oscillation transistor
51
is grounded. Further, the emitter of the oscillation transistor
51
is connected to the collector and the base via respective capacitors.
In addition, the internal and stray capacitance of the oscillation transistor
51
can be substituted for the capacitance between the emitter and collector and between the emitter and base of the oscillation transistor
51
shown in FIG.
8
. As such, these capacitors are generally not formed as external components.
SUMMARY OF THE INVENTION
The above-mentioned conventional oscillator using a dielectric resonator provides oscillation by means of the resonance at a specific frequency of the dielectric resonator and has been well-utilized in a high-frequency zone. However, one problem is that this oscillator is made over-sized (e.g., large-sized) because the dielectric resonator is large and a metal case is required to cut off the magnetic flux from the dielectric resonator.
Moreover, the conventional oscillator using a half-wave open-circuit terminal stub has problems in that the oscillator is large-sized because of the use of the half-wave open-circuit terminal stub. As such, the C/N representing the ratio of the output voltage (Carrier) to the noise power (Noise) in the vicinity of the oscillation frequency cannot be increased as high as that of an oscillator using a dielectric resonator.
The present invention has been made to solve at least such problems and to present a small-sized oscillator which easily oscillates, and an oscillation apparatus using such an oscillator.
The present invention also pertains to an oscillation apparatus which is small-sized and has a high C/N ratio.
In order to solve the above-mentioned problems, the present invention comprises an oscillation transistor, a quarter-wave open-circuit terminal stub connected to the base or gate of the oscillation transistor, and a capacitor having a resonance frequency lower than the oscillation frequency connected to the collector or drain of the oscillation transistor.
Further, the present invention is characterized in that a high-impedance line is connected in series with the capacitor.
Further, the present invention is characterized in that the oscillator and a resonator having the quarter-wave short-circuit terminal stub are magnetically coupled.
The present invention, furthermore, comprises an oscillator made up of an oscillation transistor and an open-circuit terminal stub connected to the base or gate of the oscillation transistor, and a resonator composed of a quarter-wave short-circuit terminal stub. The oscillator and the resonator both are magnetically connected together.
The oscillator according to the present invention can be made small-sized because the oscillator consists of an oscillator, a quarter-wave open-circuit terminal stub, and a capacitor.
Also, the oscillation apparatus according to the present invention can make a resonator resonate under nearly no-load conditions because the magnetic coupling of an oscillator and the resonator causes the oscillator and the resonator to resonate with each other.
REFERENCES:
patent: 4375621 (1983-03-01), Schneiter et al.
patent: 2084504 (1987-12-01), None
Hata Toshio
Oe Osamu
Tsuru Teruhisa
Burns Doane , Swecker, Mathis LLP
Kinkead Arnold
Murata Manufacturing Co. Ltd.
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