Amplification circuit with a determined input impedance and various transconductance values
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United States of America Patent
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Sep 3, 1991
Grant Date -
N/A
app pub date -
Aug 15, 1990
filing date -
Aug 16, 1989
priority date (Note) -
Expired
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Abstract
A voltage-current amplification circuit comprises two sub-circuits (B1, B2), each of which comprises a differential amplifier (D), a resistor (R4), a transistor (T), and a first switch (K1) connected between the transistor base and ground. Each sub-circuit (B1, B2) also comprises an additional amplifier (A1, A2), and an additional resistor (R2a, R2b), respectively. The inputs of the additional amplifiers being connected to ground through a common resistor (R) and to the emitters of the two transistors through a common resistor (R1). Each sub-circuit further comprises a second switch (K2) formed by a single transistor.
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