Patent ID: 9628195
Date: 2017-04-18
CPC Classifications: H03F,H03G,H03K,H04B

Claim:
1. A trans-impedance amplifier (TIA) with a dynamic range, comprising: a current amplifier configured to produce an amplified voltage signal from a received current corresponding to a power of a received optical signal, wherein the current amplifier has a reference voltage input terminal, an input terminal and an output terminal; and an impedor between the input terminal and the output terminal of the current amplifier, wherein the impedor has a resistance configured to regulate a resistance and/or impedance value of the TIA; one or more switches configured to determine the resistance of the impedor, wherein the one or more switches are enabled or disabled by a control voltage; and a hysteresis circuit configured to regulate the control voltage by comparing an input voltage corresponding to the received current with a high predetermined value and a low predetermined value, the hysteresis circuit comprising (1) an amplifier having a first input terminal, a second input terminal and an output terminal and (2) a first resistor connected between the first input terminal and the output terminal of said amplifier; wherein when the input voltage is higher than the high predetermined value, the impedor has a first resistance, when the input voltage is lower than the low predetermined value, the impedor has a second resistance greater than the first resistance.