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US 5,874,857 AGranted
Amplifier stage with dB-linear output voltage
AssigneeDeutsche Thomson-Brandt GmbH
InventorsSabine Roth, Martin Rieger
Life of this patent
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Abstract
A multiplying amplifier which is controlled in a dB linear manner. Transistors, having a numerical distribution coeffient and having the output voltage to be dB-linearly dependent responsive to a control voltage, are connected to the inputs of a muliplier.
Claims8
Amplifier stage having a gain which changes linearly with the logarithm of a control voltage, with result that a change in the control voltage by a specific ratio corresponds to a change in gain by the same ratio in dB, comprising:
- a multiplier which is controlled by the control voltage, and
- transistors connected between the control voltage and inputs of the multiplier,
- the transistors, by virtue of a numerical distribution ratio between two inputs, effect a dB-linear dependence of the output voltage relative to the control voltage.
Dependencies are inferred from the claim text.