By Harry J. Reichert, Jr., General Instrument - Jerrold Division
Various Hybrid Amplifier Circuit Configurations are being used in CATV Distribution equipment to improve output capability and provide better reliability.
The MAGIC TEE AMPLIFIER Configuration, which is the utilization of two Hybrid Integrated Circuits in parallel, will be treated in depth in this paper. An analysis of the circuitry and the performance characteristics that can be expected in the normal operating mode and various failure modes will be discussed.
Gain variation, Distortion and Noise Figure performance characteristics are compared to those of the conventional single hybrid circuit. Specific System Performance Degradation Analysis and Measurement data will be presented for MAGIC TEE AMPLIFIERS operating in "soft" failure modes. Also, the performance of MAGIC TEE and conventional single hybrid trunk amplifier cascades is compared.