Design structure for an automatic driver/transmission line/receiver impedance matching circuitry
AssigneeInternational Business Machines Corporation
InventorsWagdi W. Abadeer, Louis Lu-Chen Hsu, Jack A. Mandelman
Life of this patent
Estimating the term…
Abstract
A design structure for an impedance matcher that automatically matches impedance between a driver and a receiver. The design structure for an impedance matcher includes a phase-locked loop (PLL) circuit that locks onto a data signal provided by the driver. The impedance matcher also includes tunable impedance matching circuitry responsive to one or more voltage-controlled oscillator control signals within the PLL circuit so as to generate an output signal that is impedance matched with the receiver.
Claims5
A design structure embodied in a machine readable medium used in a design process for a circuit for automatically matching impedance between a driver and a receiver, the design structure of said circuit comprising:
- a phase-locked loop (PLL) that includes a first input for receiving a data signal from the driver, said PLL comprising a first voltage controlled oscillator (VCO) for providing a first output frequency responsive to a first VCO control voltage generated by said PLL as a function of the data signal;
- and
- impedance matching circuitry for generating an impedance-matched signal, said impedance matching circuitry including:
- a second input for receiving the data signal from the driver;
- an output for providing said impedance-matched signal to the receiver;
- and
- a first variable-capacitance capacitor having a first capacitance controlled by said first VCO control voltage, said first variable-capacitance capacitor having an input for electrically communicating with the driver and an output for electrically communicating with the receiver.
A design structure embodied in a machine readable medium for performing a method of automatically matching impedance between a communications driver and a corresponding receiver, the design structure of said method comprising:
- a means for receiving a data signal from the communications driver;
- a means for generating a voltage controlled oscillator (VCO) control voltage as a function of said data signal;
- a means for driving a VCO as a function of said VCO control voltage;
- a means for automatically generating an impedance match signal as a function of said VCO control voltage and said data signal;
- and
- a means for providing said impedance match signal to the corresponding receiver.
Dependencies are inferred from the claim text.