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US 12,483,449 B2Granted
Passive equalizer
AssigneeNXP USA, Inc.
InventorsSiamak Delshadpour, Alexander Wayne Sheldon
Life of this patent
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Abstract
One example discloses s passive equalizer circuit, including: an input configured to receive an input signal having an input frequency band; a transfer function circuit configured to transform the input frequency band into an output frequency band; and an output configured to be coupled to an active equalizer circuit and carry an output signal having the output frequency band; wherein the transfer function circuit includes a variable impedance configured to adjust a mid-band frequency gain of the output signal.
Claims15
A passive equalizer circuit, comprising:
- an input configured to receive an input signal having an input frequency band;
- a transfer function circuit configured to transform the input frequency band into an output frequency band;
- and
- an output configured to be coupled to an active equalizer circuit and carry an output signal having the output frequency band;
- wherein the transfer function circuit includes a variable impedance circuit configured to adjust a mid-band frequency gain of the output signal;
- wherein the variable impedance circuit includes a first variable capacitor (C4) having a variable capacitance in parallel with the active equalizer circuit;
- wherein the first variable capacitor adjusts a set of mid-band frequency gains of the output frequency band;
- wherein the first variable capacitor is in parallel with a first resistor (R4) having a resistance and in series with a second resistor (R3) having a resistance;
- and
- wherein the second resistor (R3) is coupled to the output.
7 more elements
Dependencies are inferred from the claim text.