Voltage amplifier having a large range of variations, and A/D co

Details Voltage amplifier having a large range of variations, and A/D co Voltage amplifier having a large range of variations, and A/D co

1996-11-25

1998-07-07

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

341159, H03F 345, H03M 136

Patent

active

057775133

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. One of the branches comprises at least two resistive elements (R21, R22) arranged in series. The amplifier AD is also provided with a third branch comprising a resistive element (R3) arranged in series with a current source (I3). 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).

REFERENCES:
patent: 4904952 (1990-02-01), Tanimoto
patent: 5345237 (1994-09-01), Kouno et al.

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