THE TAA320 INTEGRATED CIRCUIT
The TAA320 is a monolithic integrated circuit comprising three components mounted in a T0–18 envelope: a MOS transistor of the p-channel enhancement type, an npn silicon transistor and a resistor. Its circuit is given in Fig. 20.6.
The biasing resistor R adjusts the operating current, Is, of the MOS transistor. Since its transconductance is proportional to Is, resistor R must be as small as possible to obtain maximum gain; on the other hand a low value reduces amplification of the silicon transistor. A value of about 1 KΩ gives optimum overall transconductance of the whole integrated circuit.
The TAA320 has advantages in that it combines a high transconductance with a high input impedance and low noise level.
Get Consumer Electronics now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
