Fig. 1 Functional Block Diagram
The ASNT6124-BD SiGe IC is a temperature stable SiGe transimpedance amplifier that provides low-jitter broadband linear conversion of current signals at its input ports (inp/inn) into differential voltage signals at the output ports (outp/outn). The part is a serial combination of transimpedance (TIA), linear (LA), and output (OA) amplification stages. The input signal can be either differential or single-ended with the current always flowing into the corresponding pin. In case of one input being single-ended, a certain DC level signal must be applied to the other input. The part incorporates an automatic DC offset control (OSC) that effectively eliminates any difference between the common-mode voltages of direct and inverted output signals. This function requires utilization of an external 30nF capacitor attached to cfilt pad.