LC VOLTAGE-CONTROLLED OSCILLATOR
First Claim
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1. An LC voltage-controlled oscillator (VCO), comprising:
- an LC resonant circuit including at least one inductor whose both ends are connected to an output node, and two variable capacitors connected in series with each other and in parallel with the inductor; and
a first amplifier circuit including first and second negative resistance boosting transistors and first and second switching transistors,wherein drains of the first and second negative resistance boosting transistors are connected to the output node,gates and the drains of the first and second negative resistance boosting transistors are connected with each other,drains of the first and second switching transistors are connected with sources of the first and second negative resistance boosting transistors respectively, andgates of the first and second switching transistors are respectively connected with gates of the first and second negative resistance boosting transistors through capacitors and also connected with a predetermined bias voltage terminal through resistors.
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Abstract
An LC voltage-controlled oscillator (VCO) is provided. According to the LC voltage-controlled oscillator (VCO), the amplitude of an oscillation signal is improved by increasing the impedance value of an amplifier circuit seen from an output node in an LC voltage-controlled oscillator (VCO), and phase noise is also improved.
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Citations
9 Claims
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1. An LC voltage-controlled oscillator (VCO), comprising:
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an LC resonant circuit including at least one inductor whose both ends are connected to an output node, and two variable capacitors connected in series with each other and in parallel with the inductor; and a first amplifier circuit including first and second negative resistance boosting transistors and first and second switching transistors, wherein drains of the first and second negative resistance boosting transistors are connected to the output node, gates and the drains of the first and second negative resistance boosting transistors are connected with each other, drains of the first and second switching transistors are connected with sources of the first and second negative resistance boosting transistors respectively, and gates of the first and second switching transistors are respectively connected with gates of the first and second negative resistance boosting transistors through capacitors and also connected with a predetermined bias voltage terminal through resistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification