Methods and apparatus for relatively invariant input-output spectral relationship amplifiers

摘要

An electronic amplifier delivers to a load an output signal related to an input, typically with increased power. As the power output, volume, or gain of the amplifier is changed, so may the spectral characteristics of the signal. In order to maintain the desired spectral or tonal character of the output signal over the dynamic range of output power, biasing of the amplifier must be adjusted. Particular ratios of drive and bias currents and/or voltages for different implementations of amplifier technologies should be relatively constant to produce substantially invariant input-output spectral relationships from low power output through high power output settings. Several techniques are presented which provide these relationship in amplifiers.

主权项

1. An apparatus for amplifying a first electrical signal, the apparatus comprising:
a phase splitter comprising at least one device that separates an amplified first signal into one or more second signals, each second signal with a respective phase; a power amplifier, comprising one or more electron tubes, that amplifies a voltage magnitude of the one or more second signals; wherein
a bias current of the at least one device is provided by a voltage controlled differential amplifier; andthe voltage control is proportional to a control law of a respective control grid voltage of the one or more electron tubes to maintain the spectral characteristics over a dynamic range of output power.