Voltage control oscillator having modulation function
First Claim
1. A voltage controlled oscillator with a modulation function, comprising:
- a first varactor diode;
a second varactor diode whose anode side is connected to an anode side of the first varactor diode and a ground voltage;
a third varactor diode whose cathode side is connected to a cathode side of the first varactor diode;
a fourth varactor diode whose anode side is connected to an anode side of the third varactor diode and whose cathode side is connected to a cathode side of the second varactor diode;
a first resistor connected between a connection point between the anode sides of the third varactor diode and the fourth varactor diode and a connection point between the anode sides of the first varactor diode and the second varactor diode;
a modulation current terminal for performing frequency modulation that is connected to the anode sides of the third varactor diode and the fourth varactor diode;
a second resistor connected between a connection point between the cathode sides of the first varactor diode and the third varactor diode and a voltage input terminal;
a third resistor connected between a connection point between the cathode sides of the second varactor diode and the fourth varactor diode and the voltage input terminal;
a first capacitor having a first end connected to a connection point between the cathode sides of the first varactor diode and the third varactor diode;
a first inductor having a first end connected to a second end of the first capacitor;
a second capacitor having a first end connected to a connection point between the cathode sides of the second varactor diode and the fourth varactor diode;
a second inductor having a first end connected to a second end of the second capacitor; and
a voltage source connected to second ends of the first inductor and the second inductor, wherein a wave that is frequency-modulated is output by controlling a current.
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Accused Products
Abstract
There is provided a VCO having a modulation function capable of easily constituting a correction circuit which can obtain a predetermined modulation degree even when element irregularities are present. A modulation current terminal is connected to an anode side connection point of a first and a second varactor diode. A first resistor is connected between the connection point and an anode side connection point (grounding voltage) of a third and a fourth varactor diode. Voltage deciding the oscillation frequency is input from the voltage input terminal via the second resistor to the cathode side connection point of the first and the third varactor diode and via the third resistor to the cathode side connection point of the second and the fourth varactor diode. A first and a second capacitor are connected from a power source via a first and a second inductor to the cathode side of the first and the second varactor diode. Thus, it is possible to obtain a circuit having a frequency modulation degree expressed as a function of Kv.
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Citations
19 Claims
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1. A voltage controlled oscillator with a modulation function, comprising:
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a first varactor diode;
a second varactor diode whose anode side is connected to an anode side of the first varactor diode and a ground voltage;
a third varactor diode whose cathode side is connected to a cathode side of the first varactor diode;
a fourth varactor diode whose anode side is connected to an anode side of the third varactor diode and whose cathode side is connected to a cathode side of the second varactor diode;
a first resistor connected between a connection point between the anode sides of the third varactor diode and the fourth varactor diode and a connection point between the anode sides of the first varactor diode and the second varactor diode;
a modulation current terminal for performing frequency modulation that is connected to the anode sides of the third varactor diode and the fourth varactor diode;
a second resistor connected between a connection point between the cathode sides of the first varactor diode and the third varactor diode and a voltage input terminal;
a third resistor connected between a connection point between the cathode sides of the second varactor diode and the fourth varactor diode and the voltage input terminal;
a first capacitor having a first end connected to a connection point between the cathode sides of the first varactor diode and the third varactor diode;
a first inductor having a first end connected to a second end of the first capacitor;
a second capacitor having a first end connected to a connection point between the cathode sides of the second varactor diode and the fourth varactor diode;
a second inductor having a first end connected to a second end of the second capacitor; and
a voltage source connected to second ends of the first inductor and the second inductor, wherein a wave that is frequency-modulated is output by controlling a current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19)
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18. A voltage controlled oscillator with a modulation function, comprising:
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a first varactor diode;
a second varactor diode whose cathode side is connected to a cathode side of the first varactor diode and a ground voltage;
a third varactor diode whose anode side is connected to an anode side of the first varactor diode;
a fourth varactor diode whose cathode side is connected to a cathode side of the third varactor diode and whose anode side is connected to an anode side of the second varactor diode;
a first resistor connected between a connection point between the cathode sides of the third varactor diode and the fourth varactor diode and a connection point between the cathode sides of the first varactor diode and the second varactor diode;
a modulation current terminal for performing frequency modulation that is connected to the cathode sides of the third varactor diode and the fourth varactor diode;
a second resistor connected between a connection point between the anode sides of the first varactor diode and the third varactor diode and a voltage input terminal;
a third resistor connected between a connection point between the anode sides of the second varactor diode and the fourth varactor diode and the voltage input terminal;
a first capacitor having a first end connected to a connection point between the anode sides of the first varactor diode and the third varactor diode;
a first inductor having a first end connected to a second end of the first capacitor;
a second capacitor having a first end connected to a connection point between the anode sides of the second varactor diode and the fourth varactor diode;
a second inductor having a first end connected to a second end of the second capacitor; and
a voltage source connected to second ends of the first inductor and the second inductor, wherein a wave that is frequency-modulated is output by controlling a current.
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Specification