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US 5,963,102 AGranted
Voltage controlled oscillator having a ring oscillator circuit
AssigneeLG Semicon Co., Ltd.
InventorDai Sung Pang
Life of this patent
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Abstract
A voltage controlled oscillator (VCO) includes a ring oscillator controlled by an input voltage and having a ring structure, the ring oscillator including a plurality of CMOS inverter amplifiers each having an input and an output, the output of a CMOS inverter amplifier being connected to the input of a next CMOS inverter amplifier, and an inverter for inverting an output value of the ring oscillator.
Claims17
A voltage controlled oscillator (VCO), comprising:
- a ring oscillator controlled by an input voltage and having a ring structure, the ring oscillator including a plurality of CMOS inverter amplifiers each having an input, an output, and a MOS feedback transistor with a gate connected to the input voltage and source and drain connected respectively to the input and output, the output of a CMOS inverter amplifier being connected to the input of a next CMOS inverter amplifier;
- and
- an inverter for inverting an output value of the ring oscillator,
- wherein the ring oscillator generates a free running frequency which changes in accordance with the input voltage, and the voltage controlled oscillator generates a higher frequency output with a lower input voltage.
1 more element
A voltage controlled oscillator (VCO), comprising:
- a ring oscillator controlled by an input voltage and having a plurality of CMOS inverter amplifiers connected in a ring structure, wherein each CMOS inverter amplifier includes an input, an output, and a MOS feedback transistor connected between the input and output, the output of each CMOS inverter amplifier being connected to the input of a next CMOS inverter amplifier,
- wherein the ring oscillator generates a free running frequency which changes in accordance with the input voltage, and the voltage controlled oscillator generates a higher frequency output with a lower input voltage.
A voltage controlled oscillator (VCO), comprising:
- a ring oscillator controlled by an input voltage and having a plurality of CMOS inverter amplifiers connected in a ring structure, wherein each of the plurality of CMOS inverter amplifiers includes
- an input and an output,
- a PMOS transistor and a NMOS transistor connected in series between a supply voltage and a ground voltage, wherein a gate of the PMOS transistor and a gate of the NMOS transistor are connected to each other to form the input of the CMOS inverter amplifier, and
- a feedback MOS transistor having a gate connected to the input voltage, a source connected to the input of the CMOS inverter amplifier, and a drain connected to the output of the CMOS inverter amplifier;
- and
- an inverter for inverting an output value of the ring oscillator,
- wherein the output of each CMOS inverter amplifier is connected to the input of a next CMOS inverter amplifier, and the output of a last CMOS inverter amplifier in the ring oscillator is connected to the input of a first CMOS inverter amplifier and to an input of the inverter, and
- wherein the ring oscillator generates a free running frequency which changes in accordance with the input voltage, and the voltage controlled oscillator generates a higher frequency output with a lower input voltage.
5 more elements
Dependencies are inferred from the claim text.