High-impedance refers to an electrical circuit or component characterized by a significant resistance to the flow of alternating current (AC) or direct current (DC) signals. This resistance prevents substantial current flow, often used for sensing voltage with minimal impact on the source circuit. High-impedance circuits are found in various applications, including audio preamplifiers, sensor interfaces, and measurement instruments, where signal integrity and low loading of the source are paramount. The high resistance value is typically specified in ohms (Ω) and is much larger than the impedance of the source. This configuration allows for accurate voltage readings without drawing excessive current.
High-impendance meaning with examples
- The microphone's high-impedance output was connected to the preamplifier to capture the subtle nuances of the recording without loading the microphone's circuitry. A low-impedance output would require a buffer circuit to maintain signal integrity. The result was clear audio with minimal noise and distortion due to the careful impedance matching used.
- To avoid affecting the source circuit, the voltmeter utilized a high-impedance input. This design ensured that the meter could accurately measure the voltage across a circuit component without drawing any significant current and altering the behavior of the test circuit, which is vital in delicate electronics tests.
- The sensor's high-impedance output signal was fed into the data acquisition system. This configuration minimized signal loss and noise, allowing for accurate processing of the sensor's output. It allowed the readings of small variations in voltage from the source to be precisely read and processed by the system.
- The design of the amplifier incorporated a high-impedance input stage to prevent the circuit from pulling current from the input signal and allowing for a pure signal to be measured. This design ensured the amplifier could accurately process and amplify the signal without introducing any unwanted noise or distortion and allowing for better output quality.
- The oscilloscope's probe had a high-impedance setting, allowing for accurate measurement of voltage signals in high-frequency circuits. It minimized capacitive loading effects. This design ensured that the oscilloscope could accurately display the signal's waveform without significantly distorting the signals integrity due to impedance effects.