Current mirror circuit
AssigneeNokia Corporation
InventorsCarsten Rasmussen, Ivan Riis Nielsen
Life of this patent
Estimating the term…
Abstract
A current mirror circuit has an input portion including a first transistor, which is adapted to establish a reference current. It also has an output portion including a second transistor, and a control portion between the input portion and the output portion. The control portion includes a third transistor coupled for controlling the second transistor to generate an output current which is a function of the reference current while inhibiting current leakage from the input portion to the output portion. A lowpass filter is included in the control portion to prevent noise in the input portion from influencing the second transistor.
Claims12
A current mirror circuit comprising;
- an input portion including a first transistor, wherein the first transistor is adapted to establish a reference current;
- an output portion including a second transistor;
- a control portion between the input portion and the output portion, the control portion including a third transistor coupled for controlling the second transistor to generate an output current which is a function of the reference current while inhibiting current leakage from the input portion to the output portion;
- and
- a lowpass filter included in said control portion.
A station for a mobile telecommunications network, comprising a current mirror circuit according to any preceding claim.
Dependencies are inferred from the claim text.