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US 12,160,205 B2Granted
Amplifier and driver circuit
AssigneeNippon Telegraph and Telephone Corporation
InventorsTeruo Jo, Munehiko Nagatani, Hideyuki Nosaka
Life of this patent
Estimating the term…
Abstract
An amplifier circuit comprises a variable degeneration circuit connected to emitter terminals of transistors, and a variable negative capacitance circuit connected to differential output signal terminals. The variable degeneration circuit includes a variable capacitor and a resistor. The variable negative capacitance circuit, which is a variable current source, includes a transistor, a capacitor, and a variable current source. The variable negative capacitance circuit includes transistors, a capacitor, and variable current sources.
Claims17
An amplifier circuit, comprising:
- a first transistor and a second transistor having a differential configuration in which base terminals of the first transistor and the second transistor are connected to differential input signal terminals of an amplifier circuit,
- a third transistor having a base terminal connected to a collector terminal of the second transistor, a collector terminal connected to a power supply voltage, and an emitter terminal connected to a first output signal terminal on a positive phase side of an amplifier circuit;
- a fourth transistor having a base terminal connected to a collector terminal of the first transistor, a collector terminal connected to the power supply voltage, and an emitter terminal connected to a second output signal terminal on an opposite phase side of the amplifier circuit, a variable degeneration circuit connected to emitter terminals of the first transistor and the second transistor;
- and
- a variable negative capacitance circuit connected to the first output signal terminal and second output signal terminal;
- wherein the variable negative capacitance circuit includes:
- fifth and sixth transistors whose collector terminals are connected to the first output signal terminal and the second output signal terminal and whose base terminals and collector terminals are connected in a cross-coupled manner;
- a first variable current source having a first end connected to an emitter terminal of the fifth transistor and a second end connected to ground;
- and
- a second variable current source having a first end connected to an emitter terminal of the sixth transistor and a second end connected to ground.
7 more elements
A driver circuit comprising:
- a first amplifier circuit comprising:
- a first transistor and a second transistor having a differential configuration in which base terminals of the first transistor and the second transistor are connected to differential input signal terminals of an amplifier circuit,
- a third transistor having a base terminal connected to a collector terminal of the second transistor, a collector terminal connected to a power supply voltage, and an emitter terminal connected to a first output signal terminal on a positive phase side of an amplifier circuit;
- a fourth transistor having a base terminal connected to a collector terminal of the first transistor, a collector terminal connected to the power supply voltage, and an emitter terminal connected to a second output signal terminal on an opposite phase side of the amplifier circuit,
- a variable degeneration circuit connected to emitter terminals of the first transistor and the second transistor;
- and
- a variable negative capacitance circuit connected to the first output signal terminal and second output signal terminal;
- wherein the variable negative capacitance circuit includes:
- fifth and sixth transistors whose collector terminals are connected to the first output signal terminal and the second output signal terminal and whose base terminals and collector terminals are connected in a cross-coupled manner;
- a first variable current source having a first end connected to an emitter terminal of the fifth transistor and a second end connected to ground;
- and
- a second variable current source having a first end connected to an emitter terminal of the sixth transistor and a second end connected to ground;
- and
- a second amplifier circuit having a fixed frequency peaking amount, wherein the first amplifier circuit and the second amplifier circuit are connected in cascade.
11 more elements
Dependencies are inferred from the claim text.