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US 10,097,136 B1Granted
Transformer feed-back quadrature voltage controlled oscillator for correcting dynamic phase error and communication apparatus using the same
AssigneeNational Chung Shan Institute of Science and Technology
InventorsHsiao-Chin Chen, Yen-Ting Chiang, Chien-Te Yu
Life of this patent
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Abstract
A transformer feed-back quadrature voltage controlled oscillator (QVCO) includes a first VCO; a second VCO; and a dynamic phase error correction circuit, having a plurality of coupling capacitors connected between the first and second VCOs, wherein the capacitances of the coupling capacitors are varied according to a digital control signal to correct a phase error of local oscillating (LO) signals of quadrature phases output by the first and second VCOs.
Claims19
A transformer feed-back quadrature voltage controlled oscillator (QVCO), comprising:
- a first half circuit;
- and
- a second half circuit, electrically connected to the first half circuit;
- wherein each of the first and second half circuit comprises:
- a first coupling capacitor;
- a second coupling capacitor;
- an induction inductor;
- a NMOS transistor;
- a PMOS transistor;
- and
- a frequency tuning circuit, a first end thereof is connected to a first end of the induction inductor, a drain of the PMOS transistor and a gate of the NMOS transistor, and a second end thereof is connected to a second end of the induction inductor, a drain of the NMOS transistor and a gate of the PMOS transistor;
- wherein the induction inductors of the first and second half circuit form a transformer, a body of the PMOS transistor of the first half circuit is connected to a source of the PMOS transistor of the second half circuit through the first coupling capacitor of the first half circuit, a body of the NMOS transistor of the first half circuit is connected to a source of the NMOS transistor of the second half circuit through the second coupling capacitor of the first half circuit, a body of the PMOS transistor of the second half circuit is connected to a source of the NMOS transistor of the first half circuit through the first coupling capacitor of the second half circuit, a body of the NMOS transistor of the second half circuit is connected to a source of the PMOS transistor of the first half circuit through the second coupling capacitor of the second half circuit, the drains of the PMOS transistors and the NMOS transistors are used to output the LO signals of quadrature phases, and a LO frequency is determined by a frequency tuning voltage applied to the frequency tuning circuit based upon a frequency-voltage curve.
9 more elements
A communication apparatus, comprising:
- a transformer feed-back QVCO;
- a front-end circuit, connected to the transformer feed-back QVCO;
- wherein the transformer feed-back QVCO comprises:
- a first half circuit;
- and
- a second half circuit, electrically connected to the first half circuit;
- wherein each of the first and second half circuit comprises:
- a first coupling capacitor;
- a second coupling capacitor;
- an induction inductor;
- a NMOS transistor;
- a PMOS transistor;
- and
- a frequency tuning circuit, a first end thereof is connected to a first end of the induction inductor, a drain of the PMOS transistor and a gate of the NMOS transistor, and a second end thereof is connected to a second end of the induction inductor, a drain of the NMOS transistor and a gate of the PMOS transistor;
- wherein the induction inductors of the first and second half circuit form a transformer, a body of the PMOS transistor of the first half circuit is connected to a source of the PMOS transistor of the second half circuit through the first coupling capacitor of the first half circuit, a body of the NMOS transistor of the first half circuit is connected to a source of the NMOS transistor of the second half circuit through the second coupling capacitor of the first half circuit, a body of the PMOS transistor of the second half circuit is connected to a source of the NMOS transistor of the first half circuit through the first coupling capacitor of the second half circuit, a body of the NMOS transistor of the second half circuit is connected to a source of the PMOS transistor of the first half circuit through the second coupling capacitor of the second half circuit, the drains of the PMOS transistors and the NMOS transistors are used to output the LO signals of quadrature phases, and a LO frequency is determined by a frequency tuning voltage applied to the frequency tuning circuit based upon a frequency-voltage curve.
12 more elements
Dependencies are inferred from the claim text.