Hamamatsu Photonics is a renowned manufacturer of avalanche photodiodes (APDs). Their products are widely used in various applications due to their high performance and reliability. Some reasons why Hamamatsu APDs are so common are:
In summary, Hamamatsu’s investments in quality, reliability and technical expertise, along with its extensive product line and powerful brand reputation, make its APDs widely adopted.
First Sensor AG is a leading manufacturer of avalanche photodiodes (APDs), and their products are widely used in various applications due to:
In summary, First Sensor APDs are popular due to the high performance, customized solutions, technical expertise and close collaboration with industry partners they offer, allowing their products to perfectly meet customers’ needs.
An APD circuit is the electronic circuitry used to control and operate APDs. The main functions of an APD circuit are to provide the required high bias voltage to the APD and to amplify the output signal from the APD. The circuit typically consists of several components:
Bias voltage supply: APDs require a high bias voltage to operate, which must be supplied by the circuit. This can be achieved using a high voltage power supply or voltage multiplier circuitry.
Transimpedance amplifier: APDs generate very small current signals that need to be amplified to usable levels. A transimpedance amplifier is used to convert the current signal into a voltage signal for further processing.
Amplifier: The voltage signal from the transimpedance amplifier is usually very weak and requires further amplification. Depending on application needs, single-stage or multi-stage amplifier circuits can be used.
Output stage: The final output of an APD circuit is usually a voltage signal that can be used for further processing such as data acquisition or signal analysis.
Additionally, based on specific application requirements, APD circuits can also include other components like filters, protection circuitry, and control circuitry. The design of APD circuits usually involves tradeoffs between application needs and constraints imposed by available components and technologies.
Compared to PIN photodiodes, avalanche photodiodes (APDs) are often preferred in certain applications due to the following advantages:
However, APDs also have some disadvantages like requiring higher bias voltages, greater integration difficulty, and usually higher costs. Overall, APDs tend to be preferred when applications demand higher sensitivity, gain, bandwidth, noise performance and linearity, while PIN diodes may be more suitable when cost and power consumption are considerations.