Equalization of frequency-dependent gain

摘要

Systems, devices, and methods for determining and establishing frequency-dependent gain compensation in wide bandwidth communication systems are disclosed. Variable frequency-dependent gain compensation circuits, or variable equalizers, have settings that configure them to establish discrete frequency-dependent gain compensation. The frequency-dependent gain compensation can include various types and levels of gain slope and/or ripple. The settings of the variable equalizers can be set by control signals established a control circuit in response to signals from an external computer. The variable equalizers are coupled to other circuits or devices and the frequency-dependent gain of the combined circuit are measured. The settings of the variable equalizer are then changed to establish an optimal frequency-dependent gain profile or frequency-dependent gain that is closest to a predetermined frequency-dependent target gain profile. The settings can then be saved in a memory or register.

主权项

1. A circuit comprising:
a variable gain compensation circuit to establish a variable frequency-dependent gain; and a control circuit comprising an input terminal and coupled to the variable gain compensation circuit, wherein the control circuit is configured to control the variable frequency-dependent gain of the variable gain compensation circuit in response to a signal received on the input terminal from an external source, wherein the variable gain compensation circuit comprises a plurality of N variable gain compensation devices to establish a plurality of N corresponding component variable frequency-dependent gains, and wherein the variable frequency-dependent gain of the variable gain compensation circuit is a composite of at least some of the plurality of N component variable frequency-dependent gains, wherein the plurality of N variable gain compensation devices each comprise: an inductor; a capacitor; a resistor; and an amplifier, wherein each of the inductor, the capacitor, and the resistor is selectively coupled to the amplifier in parallel through one or more corresponding switches.