Variable capacitor circuit and digitally-controlled oscillator including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsYongchang Choi, Sungjoon Park, Hyoeun Park, Youngchang An, Hyotae Choo, Somin Lee
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Abstract
A variable capacitor circuit includes a capacitor block including a first varactor element comprising a first transistor having a first size, a second varactor element comprising a second transistor having a second size different from the first size, a first terminal commonly connected to a source and a drain of the first transistor, a second terminal commonly connected to a source and a drain of the second transistor, and an RC circuit connected to a gate of the first transistor and a gate of the second transistor.
Claims15
A variable capacitor circuit comprising:
- a capacitor block including a first varactor element comprising a first transistor having a first size, a second varactor element comprising a second transistor having a second size different from the first size, and an inverter having a first terminal commonly connected to a source and a drain of the first transistor, and a second terminal commonly connected to a source and a drain of the second transistor,
- wherein the first varactor element and the second varactor element are connected to each other in parallel, and
- wherein the first transistor is free from a direct connection in series to other transistors within the first varactor element, and the second transistor is free from a direct connection in series to other transistors within the second varactor element;
- and
- an RC circuit connected to a gate of the first transistor and a gate of the second transistor.
A variable capacitor circuit comprising:
- a first varactor element comprising a first transistor having a first size and configured to operate responsive to a first control signal commonly applied to a source and a drain of the first transistor;
- and
- a second varactor element comprising a second transistor having a second size and configured to operate responsive to a second control signal commonly applied to a source and a drain of the second transistor,
- wherein the first transistor is free from a direct connection in series to other transistors within the first varactor element,
- wherein the second transistor is free from a direct connection in series to other transistors within the second varactor element, and
- wherein the second size is different from the first size, and the second control signal is a complementary signal of the first control signal.
Dependencies are inferred from the claim text.