| 摘要 |
A transimpedance amplifier (100) is provided including an input, an amplifier and a non-linear limiting circuit. The input is configured to provide an input current (Iin) which includes a logic high range between a minimum input current and a maximum input current for logic high. The input current also includes a range of knee values. The amplifier is configured to generate an output voltage having a range between a first voltage and a second voltage. The non-linear limiting circuit includes a first current source, a first diode connected transistor, a second diode connected transistor, and a second current source. The first diode connected transistor (40) is prebiased to generate a first base-to-emitter voltage when the input current is approximately zero. The first diode connected transistor is configured to begin limiting the range of the output voltage (Vout) at a selected knee value, which is slightly greater than the minimum input current for logic high, by changing the first base-to-emitter voltage when the input current reaches the selected knee value of the input current.
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