Pulse shaping circuit
AssigneeJDS Uniphase Corporation
InventorsSteven J. Baumgartner, Brad Anthony Natzke
Life of this patent
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Abstract
The invention relates to a pulse shaping circuit for shaping electrical pulses driving an optical transmitter, e.g. a lased diode or an LED, and for providing electrical pulses having independently height and width-adjustable peaking at the edges thereof. The pulse shaping circuit of the present invention includes a high-pass RC filter with a differential output for providing transient electrical pulses from an input differential pulse, an adjustable voltage offset generating circuit, a differential amplifier for adjusting the width of the transient electrical pulses in dependence on the adjustable voltage offset, and a variable-gain current-steering amplifier for producing transient pulses with independently adjustable width and height.
Claims18
A pulse shaping electrical circuit comprising:
- a first input port for receiving an input electrical pulse signal having a leading edge and a trailing edge;
- a first output port for providing an output electrical pulse signal to a load in response to the input electrical pulse signal, the output electrical pulse signal having a leading edge and a trailing edge corresponding to the leading and trailing edges, respectively, of the input electrical pulse signal;
- and,
- a first adjustable peaking generating circuit electrically coupled between the first input and output ports, comprising:
- a first high-pass filter circuit for producing a first transient pulse signal from one of the leading and trailing edges of the input electrical pulse signal;
- a first tunable offset circuit coupled to the first high-pass filter for adding an adjustable voltage offset to the first transient pulse signal;
- and,
- a first differential amplifier circuit coupled to the first high-pass filter for amplifying an adjustable portion of the first transient pulse signal in dependence on the adjustable voltage offset so as to form an adjustable transient pulse signal, and for providing the adjustable transient pulse signal to the first output port;
- wherein the adjustable transient pulse signal has a width that is adjustable by varying the adjustable voltage offset, and wherein in operation the adjustable transient pulse signal provides adjustable peaking at one of the leading edge or the trailing edge of the output electrical pulse signal;
- and,
- a pulse transfer circuit electrically coupled between the first input and output ports in parallel to the first adjustable peaking generating circuit, and comprising one or more differential amplifiers for amplifying the input electrical pulse signal.
Dependencies are inferred from the claim text.