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lock_in_amplifier.pdf 锁相放大电路（英文版）
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上传时间: 2020-01-07
详细说明：锁相放大电路（英文版），针对交流小信号采集。
Synchronous detectors can extract small signals, buried in the
noise floor, to measure properties such as very small resistance,
light absorption or reflection against bright backgrounds, or
strain in the presence of high noise levels.
In many systems, the noise increases as the frequency
approaches zero. For example, op amps have 1/f noise and
light measurement is subject to noise from changing ambient
light conditions. Moving the measurement away from
the low-frequency noise increases the signal-to-noise ratio,
allowing weaker signals to be detected. For example, modulating
a light source at a few kilohertz facilitates measurement
of reflected light that would otherwise be buried in
the noise. Figure 1 shows how modulation enables recovery
of a signal that was originally below the noise floor.
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