Oscillators – Solid state active element oscillator – Transistors
Patent
1999-01-19
2000-12-05
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331144, 331177R, H03K 3282
Patent
active
061572683
ABSTRACT:
Increase of frequency and reduction of power consumption are advanced for a voltage controlled oscillation circuit. A capacitor C1 is connected between emitters of first and second transistors Tr1, Tr2 to receive an electric current from constant current sources Cs1, Cs2. Also, emitters of third and fourth transistors Tr3, Tr4 receive an electric current from a constant current source Cs3 and have their respective collectors connected through third and fourth resistors R3, R4 to a power supply terminal VCC. The respective collectors and bases of the third and fourth transistors Tr3, Tr4 are connected to bases and collectors of the first and second transistors Tr1, Tr2. Due to this, oscillation outputs are caused at respective ends of the capacitor C1, which has a voltage amplitude equal to a voltage drop due to the third and fourth resistors R3, R4 and values of currents flowing through them. The voltage drop can be decreased to such an extent that the first and second transistors Tr1, Tr2 can be turned on. Also, the voltage drop due to the first and second resistors R1, R2 and the current flowing through them can be decreased to such an extent that the third and fourth transistors Tr3, Tr4 can be turned on. This decreases the resistance value of each resistor and the value of the current flowing therethrough to thereby increase the operating speed and reduce power consumption.
REFERENCES:
patent: 4717892 (1988-01-01), Hitomi
patent: 5357220 (1994-10-01), Francis
patent: 5467060 (1995-11-01), Miyashita
patent: 5543742 (1996-08-01), Takeda
Grimm Siegfried H.
Nippon Precision Circuits, Inc
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