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Shown in the drawing is a four-gain amplifier using ion-implanted resistors with a distortion-compensating network.
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Four Gain Amplifier Using Ion Implanted Resistors
Shown in the drawing is a four-gain amplifier using ion-implanted resistors
with a distortion-compensating network.
A network of ion-implanted resistors R1, R'1, R2, R3, R'3 and R4 is
connected to input IN and to output OUT of operational amplifier AMP. The
variations of the gain V(OUT)/V(IN) are achieved by switching resistors R1, R'1
and R3, R'3 to ground through switches S1 and S2.
Ion-implanted resistors present a value which varies as a function of the
voltage applied across the resistors. Consequently, a compensating network for
correcting the voltage coefficient VCR of the resistors is required. This network
comprises resistors R5, R'5 and R6, R'6, with R5 = R'5 and R6 = R'6.
Resistors R1, R'1 and R2 and resistors R3, R'3 and R4, which contribute to
the four gains of the amplifier circuit, are laid in two epitaxial beds 1 and 2 shown
by dotted lines.
The VCR coefficients of the resistors in epitaxial bed 1 are corrected by
connecting the epitaxial layer to the common node of resistors R5 and R'5. The
VCR coefficients of the resistors in epitaxial bed 2 are corrected by connecting
the epitaxial layer to the common node of resistors R6 and R'6.
The VCR coefficients of resistors R5, R'5 and R6, R'6 are also corrected by
connecting their epitaxial layers to nodes A, B and C.
The VCR coefficients of resistors R1, R'1 and R3, R'3 are only corrected
when the switches are open, since the resistors do not contribute...