Browse Prior Art Database

Small Signal Amplifier

IP.com Disclosure Number: IPCOM000095178D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

English, WR: AUTHOR

Abstract

This small-signal amplifier amplifies low-level AC signals to a level which is adequate for performing logic operations. The input signals are supplied to an input terminal IP and then to a network including resistors R1 and R2, and a variable attenuation transistor T1. The emitter of T1 is suitably biased by a voltage divider network comprising resistors R3 and R4 with bypass capacitor C1. From the input network, the signal is passed via capacitor C2 to the base of transistor T2 grounded via resistor R5.

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Small Signal Amplifier

This small-signal amplifier amplifies low-level AC signals to a level which is adequate for performing logic operations. The input signals are supplied to an input terminal IP and then to a network including resistors R1 and R2, and a variable attenuation transistor T1. The emitter of T1 is suitably biased by a voltage divider network comprising resistors R3 and R4 with bypass capacitor C1. From the input network, the signal is passed via capacitor C2 to the base of transistor T2 grounded via resistor R5.

The emitter of T2 is connected to a negative source of potential via resistors R6... R8 and is connected to ground via capacitors C3 and C4. The collector of T2 is connected to a positive source of potential via resistors R9 and R10. Decoupling capacitor C5 is connected between R9 and R10 to ground. The collector of T2 is further connected to the base of T3. The emitter of T3 is biased via a circuit including resistors R11 and R12. The latter are bypassed by capacitor C6.

The collector of T3 is connected to the positive potential source via tuned circuit including inductance L1, capacitor C7, and resistor R13. This circuit is tuned to the frequency of the input signals. Diode D1 rectifies the output of the tuned amplifier stage including T3. The rectified output is integrated and supplied to the base of T4 by a circuit including capacitor C8 and resistor R14. The emitter of T4 is connected to the positive potential source by resistor R15....