Question

coupling capacitors (c_in and c_out) are used in a ce amplifier to: filter out specific ac frequency ranges. provide a stable dc bias point for the transistor. block ac voltage between stages while allowing dc signals to pass. block dc voltage between stages while allowing ac signals to pass. in a common collector amplifier, what happens when the load resistor is bypassed? the voltage gain increases the current gain increases the current gain decreases the output impedance decreases

Explanation:

1. Coupling capacitors in a CE amplifier block DC voltage between stages to prevent the DC bias of one stage from affecting the other, while allowing AC signals to pass through for amplification. They are not for filtering specific AC frequency ranges, providing a stable DC bias point for the transistor (biasing resistors do that), or blocking AC while allowing DC.
2. In a common - collector amplifier (emitter - follower), when the load resistor is bypassed, the output impedance decreases. The voltage gain is close to 1 and not affected by bypassing the load resistor. The current gain is mainly determined by the transistor's characteristics and not directly related to bypassing the load resistor in this context.

Answer:

1. Block DC voltage between stages while allowing AC signals to pass.
2. The output impedance decreases.