Voltage amplifier having a large range of variations, and A/D converter comprising such an amplifier
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United States of America Patent
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Jun 30, 1998
Grant Date -
N/A
app pub date -
Nov 25, 1996
filing date -
Nov 29, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A voltage amplifier AD comprising two transistors (Q1, Q2) arranged as a differential pair, having collectors which are connected to a positive power supply terminal (VCC) by means of two branches each comprising a resistive load. Each branch comprises at least two resistive elements (R11, R12, R21, R22) arranged in series. The amplifier AD is also provided with means for comparing the potentials of the different nodes of the circuit, which means allow addition of a first and a second current (IO, IO') to the current supplied in a portion of the resistive load of the second branch. These currents allow rectification of the non-linearity of the evolution of the output voltage (Vout) as a function of the input voltage (Vin).
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