Current mirror circuit and receiver using the same
AssigneeMegaChips Corporation
InventorRyota Yamahana
Life of this patent
Estimating the term…
Abstract
A current mirror circuit that amplifies a reference current generated by a current source at a first magnification to supply a mirror current to a load circuit. The current mirror circuit includes a first transistor and a second transistor that share a power supply, and a drain potential mirror unit that amplifies the reference current at a second magnification to generate a first current, that amplifies a generated first current at a third magnification to generate a second current, and that supplies a predetermined potential determined based on the second current to a drain of the second transistor. The mirror current is supplied from the second transistor to the load circuit based on a potential of a gate of the first transistor determined based on the reference current
Claims19
A current mirror circuit that amplifies a reference current generated by a current source at a first magnification to supply a mirror current to a load circuit, the current mirror circuit comprising:
- a first transistor and a second transistor that share a power supply;
- and
- a drain potential mirror unit that amplifies the reference current at a second magnification to generate a first current, amplifies a generated first current at a third magnification to generate a second current, and supplies a predetermined potential determined based on the second current to a drain of the second transistor,
- wherein the mirror current is supplied from the second transistor to the load circuit based on a potential of a gate of the first transistor determined based on the reference current.
A receiver that measures a strength of an optical signal output from a transmitter, the receiver comprising:
- a photodetector that generates a reference current based on the optical signal;
- a current mirror circuit that amplifies the reference current at a predetermined magnification to generate a mirror current;
- a current mode AD converter that converts the mirror current to a digital voltage signal at a predetermined conversion rate;
- and
- a logic unit that measures the strength of the optical signal indicated by the digital voltage signal.
Dependencies are inferred from the claim text.