Active bias circuit
AssigneeMACOM Technology Solutions Holdings, Inc.
InventorsWayne Kennan, Toshi Omori
Life of this patent
Estimating the term…
Abstract
Active bias circuits for integrated devices are described. In one example, an active bias circuit includes a voltage control element to establish a control voltage, an active bias device to provide a power bias responsive to the control voltage, and a compensation circuit connected to the active bias device. The compensation circuit can be configured to set output impedance and compensate for parasitic capacitance of the active bias device. In another embodiment, the voltage control element can be omitted, and a control voltage can be relied upon to directly control the power bias output provided by the active bias device. The active bias circuit can be used to power a driver of an integrated optical transmitter, in one example, among other possible applications.
Claims20
An active bias circuit, comprising:
- a voltage control element to establish a control voltage;
- an active bias device to provide a power bias from a power supply based on the control voltage;
- and
- a compensation circuit coupled to receive the power bias from the active bias device, the compensation circuit configured to set an output impedance of the active bias circuit and to compensate for parasitic capacitance of the active bias device.
An optical transmitter, comprising:
- a laser diode;
- a bias circuit configured to provide a power bias, the bias circuit comprising:
- a voltage control element to establish a control voltage;
- and
- an active bias device to provide the power bias based on the control voltage;
- a compensation circuit coupled to receive the power bias from the active bias device;
- and
- a driver coupled to receive the power bias from the compensation circuit and configured to provide a driving bias to the laser diode based on input data.
An active bias circuit, comprising:
- a voltage control element;
- a current source connected in series with the voltage control element, to establish a control voltage across the voltage control element;
- an active bias device to provide a power bias from a power supply based on the control voltage;
- a high-pass filter coupled between the voltage control element and the active bias device;
- and
- a compensation circuit coupled to receive the power bias from the active bias device, the compensation circuit configured to set an output impedance of the active bias circuit and to compensate for parasitic capacitance of the active bias device.
Dependencies are inferred from the claim text.