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US 2001/0054888 A1Published application
Impedance conversion circuit
AssigneeKabushiki Kaisha Toshiba
InventorsTakashi Ueno, Tetsuro Itakura, Hiroshi Tanimoto
Life of this patent
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Abstract
There is disclosed an impedance conversion circuit called a regulated cascode circuit in which a parasitic capacity deteriorating frequency characteristics is reduced during operation up to about several hundreds of megahertz or higher frequencies. In the impedance conversion circuit comprising two regulated cascode circuits in which active elements and reverse amplifiers are interconnected with a feedback applied thereto, a capacity element is disposed between a control end of one active element and an output end of the other active element.
Claims22
An impedance conversion circuit comprising:
- a first current input terminal to which a first signal current is input;
- a first transistor having a base, collector, and emitter, the emitter being connected to the first current input terminal;
- a first amplifier circuitry connected between the emitter and the base of the first transistor;
- a second current input terminal to which a second signal current having a phase opposite to a phase of the first signal current is input;
- a second transistor having a base, collector, and emitter, the emitter being connected to the second current input terminal;
- a second amplifier circuitry connected between the emitter and the base of the second transistor;
- a first capacitive element connected between the base of the first transistor and the emitter of the second transistor;
- and
- a second capacitive element connected between the base of the second transistor and the emitter of the first transistor.
6 more elements
A transconductor circuit comprising:
- a first voltage input terminal to which a first signal voltage is input;
- a first current source connected to the first voltage input terminal, configured to generate a first signal current in proportion to the first signal voltage;
- a first transistor having a base, collector, and emitter, the emitter being connected to the first current source;
- a first amplifier circuitry connected between the emitter and the base of the first transistor;
- a second voltage input terminal to which a second signal voltage having a negative phase of the first signal voltage is input;
- a second current source connected to the second voltage input terminal, configured to generate a second signal current in proportion to the second signal voltage;
- a second transistor having a base, collector, and emitter, the emitter being connected to the second current source;
- a second amplifier circuitry connected between the emitter and the base of the second transistor;
- a first capacitive element connected between the base of the first transistor and the emitter of the second transistor;
- and
- a second capacitive element connected between the base of the second transistor and the emitter of the first transistor.
8 more elements
An impedance conversion circuit comprising:
- a first current input terminal to which a first signal current is input;
- a first transistor having a gate, drain, and source, the source being connected to the first current input terminal;
- a first amplifier circuitry connected between the source and the gate of the first transistor;
- a second current input terminal to which a second signal current having a phase opposite to a phase of the first signal current is input;
- a second transistor having a gate, drain, and source, the source being connected to the second current input terminal;
- a second amplifier circuitry connected between the source and the gate of the second transistor;
- a first capacitive element connected between the gate of the first transistor and the source of the second transistor;
- and
- a second capacitive element connected between the gate of the second transistor and the source of the first transistor.
6 more elements
A transconductor circuit comprising:
- a first voltage input terminal to which a first signal voltage is input;
- a first current source connected to the first voltage input terminal, configured to generate a first signal current in proportion to the first signal voltage;
- a first transistor having a gate, drain, and source, the source being connected to the first current source;
- a first amplifier circuitry connected between the source and the gate of the first transistor;
- a second voltage input terminal to which a second signal voltage having a negative phase of the first signal voltage is input;
- a second current source connected to the second voltage input terminal, configured to generate a second signal current in proportion to the second signal voltage;
- a second transistor having a gate, drain, and source, the source being connected to the second current source;
- a first amplifier circuitry connected between the source and the gate of the second transistor;
- a first capacitive element connected between the gate of the first transistor and the source of the second transistor;
- and
- a second capacitive element connected between the gate of the second transistor and the source of the first transistor.
8 more elements
An impedance conversion circuit comprising:
- a first current input terminal to which a first signal current is input;
- a first transistor having a base, collector, and emitter, the emitter being connected to the first current input terminal;
- a first amplifier circuitry connected between the emitter and the base of the first transistor;
- a second current input terminal to which a second signal current having a phase opposite to a phase of the first signal current is input;
- a second transistor having a base, collector, and emitter, the emitter being connected to the second current input terminal;
- a second amplifier circuitry connected between the emitter and the base of the second transistor;
- a third capacitive element connected between the base of the first transistor and the collector of the second transistor;
- and
- a fourth capacitive element connected between the base of the second transistor and the collector of the first transistor.
6 more elements
An impedance conversion circuit comprising:
- a first current input terminal to which a first signal current is input;
- a first transistor having a gate, drain, and source, the source being connected to the first current input terminal;
- a first amplifier circuitry connected between the source and the gate of the first transistor;
- a second current input terminal to which a second signal current having a phase opposite to a phase of the first signal current is input;
- a second transistor having a gate, drain, and source, the source being connected to the second current input terminal;
- a second amplifier circuitry connected between the source and the gate of the second transistor;
- a third capacitive element connected between the gate of the first transistor and the drain of the second transistor;
- and
- a fourth capacitive element connected between the gate of the second transistor and the drain of the first transistor.
6 more elements
An impedance conversion circuit comprising:
- a first current input terminal to which a first signal current is input;
- a first transistor having a base, collector, and emitter, the emitter being connected to the first current input terminal;
- a first amplifier circuitry connected between the emitter and the base of the first transistor;
- a second current input terminal to which a second signal current having a phase opposite to a phase of the first signal current is input;
- a second transistor having a base, collector, and emitter, the emitter being connected to the second current input terminal;
- a second amplifier circuitry connected between the emitter and the base of the second transistor;
- a first capacitive element connected between the base of the first transistor and the emitter of the second transistor;
- a second capacitive element connected between the base of the second transistor and the emitter of the first transistor;
- a third capacitive element connected between the base of the first transistor and the collector of the second transistor;
- and
- a fourth capacitive element connected between the base of the second transistor and the collector of the first transistor.
8 more elements
An impedance conversion circuit comprising:
- a first current input terminal to which a first signal current is input;
- a first transistor having a gate, drain, and source, the source being connected to the first current input terminal;
- a first amplifier circuitry connected between the source and the gate of the first transistor;
- a second current input terminal to which a second signal current having a phase opposite to a phase of the first signal current is input;
- a second transistor having a gate, drain, and source, the source being connected to the second current input terminal;
- a second amplifier circuitry connected between the source and the gate of the second transistor;
- a first capacitive element connected between the gate of the first transistor and the source of the second transistor;
- a second capacitive element connected between the gate of the second transistor and the source of the first transistor;
- a third capacitive element connected between the gate of the first transistor and the drain of the second transistor;
- and
- a fourth capacitive element connected between the gate of the second transistor and the drain of the first transistor.
8 more elements
Dependencies are inferred from the claim text.