Final answer:
The behavior of an automatic gain control (AGC) loop is determined by the signal strength and the reference voltage, as these two variables are compared to adjust the gain for consistent output.
Step-by-step explanation:
The behavior of an automatic gain control (AGC) loop is primarily determined by the signal strength and the reference voltage. The AGC loop works by comparing the strength of the incoming signal to the reference voltage and then adjusting the gain accordingly to maintain a consistent output level. For example, if the signal strength is weaker than the reference voltage, the AGC will increase the gain, and if it is stronger, the AGC will decrease the gain to ensure the output remains constant.
An AGC loop is a feedback system used in various electronic devices such as radios and telecommunications equipment to maintain a stable signal level. The loop adjusts the gain of the amplifier to compensate for changes in signal strength, ensuring consistent quality of transmission or reception. The correct answer to which two variables primarily determine the behavior of an AGC loop is (c) signal strength and reference voltage. This is because the AGC circuit operates by comparing the amplitude of the incoming signal (signal strength) to a predetermined level (reference voltage), and adjusts the gain to achieve the desired output.