Voltage controlled oscillation circuit

A voltage controlled oscillation circuit, which comprises:

• an amplifier circuit, including a first node;
• an amplifier circuit tail current source, having one end coupled to the first node, and the other end coupled to a power source voltage;
• a latch circuit, including a second node;
• a latch circuit tail current source, having one end coupled to the second node, and the other end coupled to the power source voltage;
• a load resistor, having one end electrically connected to the amplifier circuit and the latch circuit, and the other end electrically connected to a ground voltage;
• and,
• a current modulation circuit, including a first NMOS switch, a second NMOS switch and a modulation circuit tail current source, wherein the first NMOS switch is coupled to the first node, the second NMOS switch is coupled to the second node, and the modulation circuit tail current source having one end coupled to the first NMOS switch and the second NMOS switch, and the other end coupled to the ground voltage.

A voltage controlled oscillation circuit, which comprises:

• an amplifier circuit, having one end coupled to an output, and the other end provided with a first node;
• a latch circuit, having one end coupled to the output, and the other end provided with a second node;
• an amplifier circuit tail current source, coupled to the first node for providing the first current amount flowing through the first node;
• a latch circuit tail current source, coupled to the second node for providing the second current amount flowing through the second node;
• and,
• a current modulation circuit, coupled to the first node and the second node for branching at least a portion of the current amount from the first current amount based on at least one control voltage to determine the current amount flowing through the amplifier circuit, and for branching at least a portion of the current amount from the second current amount to determine the current amount flowing through the latch circuit;
• wherein the oscillation frequency of the voltage controlled oscillation circuit is corresponding to the current amount flowing through the amplifier circuit and the current amount flowing through the latch circuit.