SMALL SIGNAL FUNCTIONAL CIRCUITS.
Abstract
The report describes the second quarter's effort leading to the design and fabrication of linear integrated circuits to be used in an FM receiver. This work covers the development of circuits to be used in the receiver front end (before the i-f filter). During the second quarter, breadboard designs for the front end circuits were evaluated. By evaluating performance of the individual circuits and their performance in a breadboard receiver, configurations were selected for the front end circuits. The circuits chosen are outlined below. (1) RF Amplifier. A direct coupled common emitter-common emitter stage was selected for the rf amplifier. (2) First Oscillator. Of the circuits evaluated for a first oscillator, one employing positive feedback from collector to emitter was selected. Additional negative feedback from collector to base is utilized to restrict the frequency of oscillation to the proper crystal overtone frequency. (3) Second Oscillator. The second oscillator employs a grounded collector configuration. (4) Mixer. One circuit was designed to serve as both the first and second mixer. This circuit is basically a common emitter stage biased so that conduction is established by the local oscillator injection. The above circuits are presently being fabricated in integrated circuit form. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1964
- Accession Number
- AD0615125
Entities
People
- James Feit
Organizations
- Motorola Mobility