A transimpedance amplifier (TIA) is a circuit that converts a
current signal into output voltage signal whose voltage is
dependent on magnitude of current. The demand of higher
data rates transportation over the internet and multimedia
communication in recent years result in fast development of
high speed optical communication system. Transimpedance
amplifiers are very useful circuit components in optical
communication system. Front-end of transimpedance
amplifier (TIA) is one of most critical building block at electro
optical interface on receiver side, which determines the
performance of whole system to a large extent, such as speed,
gain, sensitivity and noise etc. The performance of optical
interconnection system depends on receiver gain, bandwidth,
noise and power consumption. Silicon-based CMOS
technology [1] is the only candidate which can achieve the
required level of integration with reasonable speed, gain, cost,
power consumption.
The transimpedance amplifier [2] uses a closed loop circuits as
shown in figure 1. This circuit allows not only to avoid the
problem of the dynamic range, but also to obtain a trade-off
between the high and low impedance configuration. It is
relatively high bandwidth and dynamic range as well as a
good noise level.