Voltage-controlled oscillator (VCO) having cascode transistors with improved signal quality and gain
AssigneeQUALCOMM Incorporated
InventorsAmit Jha, Ngar Loong Alan Chan
Life of this patent
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Abstract
Certain aspects of the present disclosure are directed towards a voltage-controlled oscillator (VCO). The VCO may include: a first n-type metal-oxide-semiconductor (NMOS) transistor having a gate coupled to a first output of the VCO; a second NMOS transistor having a gate coupled to a second output of the VCO; a first NMOS cascode transistor coupled in cascode between the first NMOS transistor and the second output; and a second NMOS cascode transistor coupled in cascode between the second NMOS transistor and the first output, wherein gates of the first NMOS cascode transistor and the second NMOS cascode transistor are coupled to a common-mode voltage (Vcm) node of the VCO.
Claims23
A voltage-controlled oscillator (VCO), comprising:
- a first n-type metal-oxide-semiconductor (NMOS) transistor having a gate coupled to a first output of the VCO;
- a second NMOS transistor having a gate coupled to a second output of the VCO;
- a first NMOS cascode transistor coupled in cascode between the first NMOS transistor and the second output;
- and
- a second NMOS cascode transistor coupled in cascode between the second NMOS transistor and the first output, wherein gates of the first NMOS cascode transistor and the second NMOS cascode transistor are coupled to a common-mode voltage (Vcm) node of the VCO.
A method for oscillating signal generation, the method comprising:
- generating, via a voltage-controlled oscillator (VCO), an oscillating signal, wherein the VCO comprises:
- a first n-type metal-oxide-semiconductor (NMOS) transistor having a gate coupled to a first output of the VCO;
- a second NMOS transistor having a gate coupled to a second output of the VCO;
- a first NMOS cascode transistor coupled in cascode between the first NMOS transistor and the second output;
- and
- a second NMOS cascode transistor coupled in cascode between the second NMOS transistor and the first output;
- and
- providing a common-mode voltage (Vcm) at a Vcm node of the VCO to gates of the first NMOS cascode transistor and the second NMOS cascode transistor.
A voltage-controlled oscillator (VCO), comprising:
- a first p-type metal-oxide-semiconductor (PMOS) transistor having a gate coupled to a first output of the VCO;
- a second PMOS transistor having a gate coupled to a second output of the VCO;
- a first PMOS cascode transistor coupled in cascode between the first PMOS transistor and the second output;
- a second PMOS cascode transistor coupled in cascode between the second PMOS transistor and the first output, wherein gates of the first PMOS cascode transistor and the second PMOS cascode transistor are coupled to a reference potential node of the VCO;
- a first n-type metal-oxide-semiconductor (NMOS) transistor having a drain coupled to a source of the first PMOS cascode transistor and having a source coupled to a drain of the first PMOS cascode transistor;
- and
- a second NMOS transistor having a drain coupled to a source of the second PMOS cascode transistor and having a source coupled to a drain of the second PMOS cascode transistor.
A voltage-controlled oscillator (VCO), comprising:
- a first p-type metal-oxide-semiconductor (PMOS) transistor having a gate coupled to a first output of the VCO;
- a second PMOS transistor having a gate coupled to a second output of the VCO;
- a first PMOS cascode transistor coupled in cascode between the first PMOS transistor and the second output;
- a second PMOS cascode transistor coupled in cascode between the second PMOS transistor and the first output, wherein gates of the first PMOS cascode transistor and the second PMOS cascode transistor are coupled to a reference potential node of the VCO;
- and
- a filter coupled between the reference potential node and the gates of the first PMOS cascode transistor and the second PMOS cascode transistor.
Dependencies are inferred from the claim text.