| 摘要 |
A variable impedence photodiode detector circuit for use in detecting signals in the infrared (IR) includes circuitry to maintain a constant reverse bias voltage on the photodetector to maintain the best signal transfer characteristics regarding frequency response, analog bandwidth, sensitivity, output current range, and signal-to-noise ratio over an operating range from total darkness to maximum daylight. A series current source varies the current to the photodiode in response to variations in detector impedence.
|
