Method and apparatus having enhanced oscillator phase noise using high Vt MOS devices
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H03B-005/12
H03K-003/013
G06F-017/50
출원번호
US-0712336
(2015-05-14)
등록번호
US-9734265
(2017-08-15)
발명자
/ 주소
Arora, Himanshu
Akhtar, Siraj
Klemmer, Nikolaus
출원인 / 주소
TEXAS INSTRUMENTS INCORPORATED
대리인 / 주소
Albin, Gregory J.
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
A voltage-controlled oscillator (VCO), includes a resonator circuit connected to receive an input voltage and having a first output node and a second output node; and at least one cross-coupled switching circuit portion, each cross-coupled switching circuit portion comprising a first transistor havi
A voltage-controlled oscillator (VCO), includes a resonator circuit connected to receive an input voltage and having a first output node and a second output node; and at least one cross-coupled switching circuit portion, each cross-coupled switching circuit portion comprising a first transistor having a drain connected to the first output node and a second transistor having a drain connected to the second output node, the first transistor having a gate connected between the drain of the second transistor and the second output node and the second transistor having a gate connected between the drain of the first transistor and the first output node, each of the first and second transistors having a threshold voltage that is determined to be the highest threshold voltage available for the process used to create the VCO.
대표청구항▼
1. A voltage-controlled oscillator (VCO), comprising: a resonator circuit connected to receive an input voltage and having a first output node and a second output node; andat least one cross-coupled switching circuit portion, each cross-coupled switching circuit portion comprising a first transistor
1. A voltage-controlled oscillator (VCO), comprising: a resonator circuit connected to receive an input voltage and having a first output node and a second output node; andat least one cross-coupled switching circuit portion, each cross-coupled switching circuit portion comprising a first transistor having a drain connected to the first output node and a second transistor having a drain connected to the second output node, the first transistor having a gate connected between the drain of the second transistor and the second output node and the second transistor having a gate connected between the drain of the first transistor and the first output node, each of the first and second transistors having a threshold voltage that is determined to be the highest threshold voltage available for the process used to create the VCO, wherein a magnitude of the threshold voltage for each of the first and second transistors is greater than or equal to one volt. 2. The VCO as recited in claim 1, wherein the resonator circuit comprises at least one inductor circuit and at least one capacitor circuit, a first terminal of the at least one inductor circuit and a first terminal of the at least one capacitor circuit being connected in common to the first output node and a second terminal of the at least one inductor circuit and a second terminal of the at least one capacitor circuit being connected in common to the second output node. 3. The VCO as recited in claim 2, wherein the resonator circuit comprises a multiport inductor. 4. The VCO as recited in claim 1, wherein the first and second transistors are, respectively, first and second NMOS transistors, each of said first and second NMOS transistors having a source connected to a lower voltage rail. 5. The VCO as recited in claim 1, wherein the first and second transistors are, respectively, first and second PMOS transistors, each of said first and second PMOS transistors having a source connected to an upper voltage rail. 6. The VCO as recited in claim 1, wherein the at least one cross-coupled switching circuit portion comprises a first cross-coupled switching circuit portion comprising first and second PMOS transistors, each of said first and second PMOS transistors having a source connected to an upper voltage rail, and a second cross-coupled switching circuit portion comprising first and second NMOS transistors, each of said first and second NMOS transistors having a source connected to an lower voltage rail. 7. A voltage-controlled oscillator (VCO), comprising: a resonator circuit connected to receive an input voltage and having a first output node and a second output node; andat least one cross-coupled switching circuit portion, each cross-coupled switching circuit portion comprising a first transistor having a drain connected to the first output node and a second transistor having a drain connected to the second output node, the first transistor having a gate connected between the drain of the second transistor and the second output node and the second transistor having a gate connected between the drain of the first transistor and the first output node, each of the first and second transistors having a threshold voltage that is determined to be the highest threshold voltage available for the process used to create the VCO. 8. The VCO as recited in claim 7, wherein the resonator circuit comprises at least one inductor circuit and at least one capacitor circuit, a first terminal of the at least one inductor circuit and a first terminal of the at least one capacitor circuit being connected in common to the first output node and a second terminal of the at least one inductor circuit and a second terminal of the at least one capacitor circuit being connected in common to the second output node. 9. The VCO as recited in claim 8, wherein the resonator circuit comprises a multiport inductor. 10. The VCO as recited in claim 7, wherein the first and second transistors are, respectively, first and second NMOS transistors, each of said first and second NMOS transistors having a source connected to a lower voltage rail. 11. The VCO as recited in claim 7, wherein the first and second transistors are, respectively, first and second PMOS transistors, each of said first and second PMOS transistors having a source connected to an upper voltage rail. 12. The VCO as recited in claim 7, wherein the at least one cross-coupled switching circuit portion comprises a first cross-coupled switching circuit portion comprising first and second PMOS transistors, each of said first and second PMOS transistors having a source connected to an upper voltage rail, and a second cross-coupled switching circuit portion comprising first and second NMOS transistors, each of said first and second NMOS transistors having a source connected to an lower voltage rail.
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