Gain compensation for an open loop programmable amplifier for high speed applications

Abstract

Various embodiments relate to a method and apparatus for maintaining constant gain in an open loop gain stage amplifier, the circuit including a reference signal generator configured to generate a plurality of reference voltages, a gain compensation circuit, including a reference selector configured to select one of the plurality of reference voltages for each of a plurality of gain stages, an error amplifier configured to output a control voltage signal to a selector, a selector configured to select which of a plurality of degeneration resistors in the open loop gain stage amplifier to apply the control voltage signal wherein the voltage signal is applied to the gate of at least one of the plurality of degeneration resistors in the open loop gain stage amplifier.

Description

TECHNICAL FIELD[0001]This disclosure relates generally to obtaining a constant gain parameter for an amplifier, and more specifically, but not exclusively, to a method for keeping the gain of an open loop amplifier with degeneration resistance constant.SUMMARY OF EXEMPLARY EMBODIMENTS[0002]A brief summary of various embodiments is presented below. Embodiments address the need to create gain compensation for an open loop programmable amplifier for high speed applications.[0003]In order to overcome these and other shortcomings of the prior art and in light of the need to create gain compensation for an open loop programmable amplifier for high speed applications, a brief summary of various exemplary embodiments is presented. Some simplifications and omissions may be made in the following summary, which is intended to highlight and introduce some aspects of the various exemplary embodiments, but not to limit the scope of the invention.[0004]Detailed descriptions of a preferred exemplar...

AI Technical Summary

Benefits of technology

The solution effectively keeps the gain of open loop gain stages constant, reducing headroom and maintaining linearity, while allowing for high-speed operation with minimal gain variation, similar to closed loop systems, and is applicable across various dynamic range and technology platforms.

Problems solved by technology

Closed loop gain stages use feedback and provide a high accuracy gain, but have limited bandwidth due to a feedback system.

The resistor-inductor (“RL”) circuit may be adjusted too, but not a good choice for high speed applications.

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