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Wide Band Amplifier

IP.com Disclosure Number: IPCOM000098774D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

French, WK: AUTHOR

Abstract

An amplifier is shown at the left which includes a high frequency oscillator OSC and a bridged-T network which exhibits high gain and wide band response. These features are derived from the discriminating characteristics of the bridged-T network with respect to various frequency levels of OSC which are established under control of an input signal E(I).

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Wide Band Amplifier

An amplifier is shown at the left which includes a high frequency oscillator OSC and a bridged-T network which exhibits high gain and wide band response. These features are derived from the discriminating characteristics of the bridged- T network with respect to various frequency levels of OSC which are established under control of an input signal E(I).

The basic frequency f of OSC which might be 700 megacycles, for example, is initially established at a point midway between the maximum attenuation frequency f(max), and the minimum attenuation frequency f(min), of the bridged- T network (right figure). This is determined by the values of the inductance 1 and the capacitor 2 which form the resonant tank circuit of OSC. Fluctuations in the input signal across a voltage variable capacitor C, which is in parallel with the OSC tank circuit, result in variations in the basic frequency f(o). The output of OSC, which is constant in amplitude over a wide frequency range, is directed to the bridged-T network and subsequently rectified in a detector stage DET.

Movement of the OSC frequency downward, caused by a small change of E(I) in one direction (arrow D), results in a decrease in attenuation of the bridged- T network and an increase in the output voltage E(0). Movement of the OSC frequency upward, caused by a small change of E(1) in the opposite direction (arrow U), results in an increase in attenuation of the bridged-T network and a consequent decre...